Tags for Chevy Small Block Chart: 2006 Chevy Small-Block Quick Reference Chart CAST IRON SMALL-block
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
10105123 14093638 9.025" Std Open 4.000"– 4.030" 4 Straight Grey iron 350 Wet 1 pc 3.75" 181 350 Street 167
88962516 — 9.025" Std Open 4.005"– 4.030" 4 Straight Grey iron 350 Wet 1 pc 3.80" 181 450 Street 167
10066034 — 9.025" Std Open 4.000"– 4.030" 4 Straight Grey iron 350 Wet 2 pc 3.75" — 350 Street 167
10051183 10051184 9.025" Std Siamese 4.000"– 4.155" 2 Straight Grey iron 350 Wet 1 pc 3.75" 187 400 Street 168
10185047 10051184 9.025" Std Siamese 3.980"– 4.155" 4 Straight Grey iron 350 Wet 1 pc 3.75" 182 450 Amateur 169
12480174 10051184 9.025" Std Siamese 3.980"– 4.155" 4 20 deg Nodular 350 Wet 1 pc 3.75" 196 500 Amateur 169
12480047 10051184 9.025" Std Siamese 3.980"– 4.155" 4 20 deg Nodular 350 Wet 2 pc 3.75" 208 500 Amateur 169
12480175 10051184 9.025" Std Siamese 4.117"– 4.155" 4 20 deg Nodular 350 Wet 1 pc 3.75" 196 500 Amateur 169
12480157 10051184 9.025" Std Siamese 4.117"– 4.155" 4 20 deg Nodular 350 Wet 2 pc 3.75" 196 500 Amateur 169
12480049 10051184 9.025" Std Siamese 3.980"– 4.155" 4 20 deg Nodular 400 Wet 2 pc 3.75" 208 500 Amateur 169
12480159 10051184 9.025" Std Siamese 4.117"– 4.155" 4 20 deg Nodular 400 Wet 2 pc 3.75" 196 500 Amateur 169
24502501 10051182 9.025" Std Open 3.875"– 4.030" 4 20 deg 8620 steel 350 Wet 2 pc 3.75" 190 650 Pro 170
24502503 10051184 9.025" Std Siamese 3.980"– 4.155" 4 20 deg 8620 steel 350 Wet 2 pc 3.75" 208 700 Pro 171
12480045 10051184A 9.025" Std Siamese 4.116"– 4.185" 4 17 deg 4140 steel 283 Dry 2 pc 3.75" 192 800 Pro 172
12480046 10051184A 9.025" Std Siamese 4.116"– 4.185" 4 17 deg 4140 steel 350 Dry 2 pc 3.75" 192 800 Pro 172
SHORT DECK CAST IRON BLOCK
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
12480050 12480050 8.700" Std Siamese 3.980"– 4.190" 4 20 deg 8620 steel 283 Dry 2 pc 3.48" 216 800 Pro 171
24502650 24502650C 8.325" Std Siamese 3.980"– 4.185" 4 20 deg 8620 steel 283 Dry 2 pc 3.25" 167 800 Pro 171
SB2.2 block
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
12480097
10051184A 9.025" SB2.2 Siamese 4.116"– 4.185" 4 17 deg 4140 steel 283 Dry 2 pc 3.75" 192 800 Pro 172
12480098 10051184A 9.025" SB2.2 Siamese 4.116"– 4.185" 4 17 deg 4140 steel 350 Dry 2 pc 3.75" 192 800 Pro 172
R0X SB2.2 BLOCK
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
25534453
25534351 9.025" SB2.2 Siamese 4.166"– 4.250" 4 17 deg 4140 steel 283 Dry 2 pc 3.75" 196 800 Pro 173 R0X NON SB2.2 BLOCK
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
25534452 25534351 9.025" None Siamese 4.166"– 4.250" 4 17 deg 4140 steel 283 Dry 2 pc 3.75" 196 800 Pro 173 ROCKET BLOCK
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
22551788 — 9.025" Std Siamese 4.000"– 4.180" 4 18 deg Steel 350 Wet 2 pc 4.125" 200 500 Pro 174 ALUMINUM SMALL-block
Part Cast Deck Lifter Cyl Bore Main Main Bolt Cap Crank Oiling Seal Max Weight Max Usage Page Number Number Height Pattern Wall Range Bolt Degree Material Jnl Size Type Stroke (lbs) HP Number
10185075 10134398 9.025" Std Siamese 3.986"– 4.135" 4 20 deg 8620 steel 350 Wet 2 pc 3.75" 90 800 Pro 175
10134400 10134398 9.025" Std Siamese 4.117"– 4.135" 4 20 deg 8620 steel 400 Dry 2 pc 3.75" 89 800 Pro 175
24502495 24502495 9.525" Std Siamese 4.117"– 4.135" 4 20 deg 8620 steel 400 Dry 2 pc 4.125" 101 850 Pro N/S PRODUCTION-BASED block The GM Performance Parts production-based block are the right choice for street car rebuilds or to start your own mild engine project. They come in the same dimensions that you are already familiar with and are produced to the high level of quality that GM is famous for. Remember, these are brand new castings that are machined to our exacting tolerances and delivered to you at an affordable price. These block are designed for street engines that demand good strength and a high level of durability.
Production-Based Block Technical Note:
• Cylinder walls are the same thickness as current production engines
• Non-siamese bores
• Standard 350 main journal sizes
• Lifter valleys are machined for hydraulic roller and flat tappets
• Use seal adapter P/N 10051118 to use 2-piece rear main crankshafts in these block
See chart on page 166 for complete specifications.
10105123 350 Bare Block (1986–later Style), 1-Piece Rear Main Seal •
Cast iron 4 - bolt block • 4.00" bore• Machined for hydraulic roller or flat tappets
88962516
383 Bare Block (1986– later Style), 1-Piece Rear Main Seal
• Cast iron 4 - bolt block
• 4.005" bore
• Clearanced for 3.80" stroker crankshaft
• Machined for hydraulic roller or flat tappets 10066034
350 Bare Block (Pre-1986 Style), 2-Piece Rear Main Seal
• Cast iron 4 - bolt block
• 4.00" bore
• Can be used for 302, 327, or 350 engines
• Machined for hydraulic roller or flat tappets
• Used on 1973-85 GM Goodwrench 350 engines GM PERFORMANCE PARTS BOWTIE SPORTSMAN BLOCK  This is the block to buy if you want to build a serious street car or if you want to head to the race track! The GM Performance Parts Bowtie Sportsman block has been the starting point for countless racing engines. These iron block are available in a variety of finish options to build almost any engine combination. Most of these block have siamesed cylinder walls1 and four-bolt main caps2 that are secured by Grade 8 bolts. All block in this family have a 9.025” deck height. The Bowtie Sportsman block are a great foundation for your serious street car, circle track, or drag car that makes between 350 and 500 horsepower.
Bowtie block are called out by main journal sizes (i.e., 283, 350 or 400) and then by bore size (i.e., 283, 305, 350 or 400) if the bore is not standard to the main size. Example: #24502501—“350 Main- 283 Bore size”—has standard 350 main journal sizes, however the bore is standard 283 size (for those of you old enough to remember 283s).  Bowtie Sportsman Block Technical Note:
• 2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843, required at all five locations (except for block 10051183)
• 0.900" thick main bearing bulkheads, Grade 8 main bolts
• Priority main oiling system
• Standard 9.025"deck height
• Cylinder bores have a nominal wall thickness of 0.340"
• 0.225" minimum cylinder bore wall thickness at 4.155" bore
(excluding P/N 10051181, 10051183, & 10185047)
• Extra thick deck surfaces with blind-tapped head bolt holes
for improved head gasket sealing
• Tall lifter bore block may require clearancing the top of lifter bores for use with some roller lifters
• Timing system clearance must be checked for interference
• Lifter valley oil scavenging boss behind cylinder #8 below bell housing flange is present, but not drilled & tapped
• Oil dipstick holes are not drilled
• Use seal adapter P/N 10051118 to use 2-piece rear main crankshafts in 1-piece rear main block
See chart on page 166 for complete specifications.
Two-Bolt 350 Main block
Two-bolt main bearing caps are installed to simplify the installation of the heavy duty four-bolt steel main caps with splayed outer bolts.  A. 10051183
350 Bowtie Block, 1-Piece Rear Main Seal
• Cast iron maximum effort block
• 2-bolt mains
• 3.980" rough bore
• 4.090" max bore (siamese cylinder bores)
Four-Bolt 350 Main block
10185047
350 Bowtie Sportsman Block
• Cast iron maximum effort block
• 4- bolt “straight” nodular mains
• 3.980" rough bore
• 4.090" max bore (siamese cylinder bores)
• Replaces older 4-bolt, 2-pc rear main seal block P/N 366287
• Rear main seal adapter required! 12480174
350 Bowtie Sportsman Block, 1-Piece Rear Main Seal
• CNC-machined cast iron competition block
• +/-0.001" machining tolerances
• 4-bolt nodular mains, splayed caps on center 3 mains
• 3.980" finished bore
• 4.155" max bore
• Extra smooth gasket surfaces for better seal
• Tall lifter bores
• Comes with rear seal adapter 12480047
350 Bowtie Sportsman Block, 2-Piece Rear Main Seal
• CNC-machined cast iron competition block
• +/-0.001" machining tolerances
• 4-bolt nodular mains, splayed caps on center 3 mains
• 3.980" finished bore
• 4.155" max bore
• Extra smooth gasket surfaces for better seal
• Tall lifter bores 12480175
350 Main, 400 Bore Size Bowtie Sportsman Block, 1-Piece Rear Main Seal
• CNC-machined cast iron competition block
• +/-0.001" machining tolerances
• 4-bolt nodular mains, splayed caps on center 3 mains
• 4.117" finished bore
• 4.155" max bore
• Extra smooth gasket surfaces for better seal
• Tall lifter bores
• Comes with rear seal adapter  12480157
350 Main, 400 Bore Size Bowtie Sportsman Block, 2-Piece Rear Main Seal
• CNC-machined cast iron competition block
• +/-0.001" machining tolerances
• 4-bolt nodular mains, splayed caps on center 3 mains
• 4.117" finished bore
• 4.155" max bore
• Extra smooth gasket surfaces for better seal
• Tall lifter bores
Four-Bolt 400 Main block
12480049
400 Main, 350 Bore Size Bowtie Sportsman Block, 2-Piece Rear Main Seal
• CNC-machined cast iron competition block
• +/-0.001" machining tolerances
• 4-bolt nodular mains, splayed caps on center 3 mains
• 3.980" finished bore
• 4.155" max bore
• Extra smooth gasket surfaces for better seal
• Tall lifter bores  12480159
400 Bowtie Sportsman Block, 2-Piece Rear Main Seal
• CNC-machined cast iron competition block
• +/-0.001" machining tolerances
• 4-bolt nodular mains, splayed caps on center 3 mains
• 4.117" finished bore
• 4.155" max bore
• Extra smooth gasket surfaces for better seal
• Tall lifter bores
GM PERFORMANCE PARTS RACE block Our race block take the guess work out of what block you need to make big horsepower. They are competition tested in NASCAR, BUSCH, and NHRA Competition Eliminator! GM Performance Parts offers you a huge selection of race block that have been precision, CNC-machined3 with tighter tolerances than our Bowtie block before you even get them. These block feature full race-prep machining, 4-bolt splayed4 main caps, and the very highest grade of materials throughout. When your competition has spilled their guts all over the racetrack, you’ll still be in the show thanks to your GM Performance Parts race block!
See chart on page 166 for complete specifications.  GM Performance Parts Race Block Technical Note:
• These block are CNC’d to +/-.001" machining tolerances!
• Cylinder decks, front and rear of case, oil pan rail surfaces and head dowel pins are blueprinted!
• Non-standard cam bearings required (see each block for details)
• Cam bosses are enlarged to allow machining for the use of larger bearings
• Extra thick main bearing bulkhead machined at 5
• Premium quality main studs & SAE 8620 steel main bearing caps
• Billet wet sump rear main cap can be adapted to dry sump with plugs
• Bearing cap inner bolts are spread 0.210" to allow machining for use with 400 journal crankshafts
• Priority main oiling system
• 2-piece rear-main crankshafts & pre-1986 oil pans required
• Extra thick deck surfaces with blind-tapped head bolt holes for improved head gasket sealing
• Cylinder bores have a nominal wall thickness of .340"
• 0.225" min. cylinder bore wall thickness at 4.155" bore, Sonic bore check data sheet provided
• These block may require clearancing the top of lifter bores for some aftermarket mechanical roller lifters
• Timing system clearance should be checked before engine assembly
• Lifter valley oil scavenging boss behind cylinder #8 below bell housing flange is not drilled & tapped
• Oil dipstick holes are not drilled
 24502501
350 Main, 283 Bore Cast Iron Bowtie Race Block
• Cast iron competition block right out of the box
• 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains
• 2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843 required at all five locations
• 3.875" finished bore (non-siamese bores)
• 4.030" max bore
• 9.025" deck height
• Shipped with 2-piece rear main seal adapter installed
• Oil galleries for dry sump system are oversized and tapped for pipe plugs
• Supplied with sonic data sheet
• Tested to over 650 horsepower!
 24502503
350 Cast Iron Bowtie Race Block
• Cast iron competition block right out of the box
• 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains
• 2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843 required at all five locations
• 3.980" finished bore (siamese bores)
• 4.155" max bore
• 9.025" deck height
• Oil galleries for dry sump system are oversized and tapped for pipe plugs
• Supplied with sonic data sheet
• Tested to over 700 horsepower!
 24502650
283 Main, 350 Bore Size Short-Deck Bowtie Race Block
• CNC Cast iron competition block designed for drag racing, road racing or restricted oval track racing!
• 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains
• 8.325" deck (as of 10/03) (standard deck block are 9.025"), can be machined to 8.200" deck height
• Camshaft is raised 0.433" to 4.955"
• Cam bearing bores machined for 2.250" O.D. x 1.875 roller bearings
• 3.980" rough bore
• 4.190" max bore (minimum of .250" cylinder bore wall thickness) (siamese bores)
• Integral oil restrictors
• Must use Big Block water pump, must raise water pump with adapters for balancers larger than 6"
• Olds Aurora V-8 bell housing bolt pattern (12.25" max flywheel diameter)
• Lifter holes and cylinder head bolt holes are not drilled
• Will accept standard, SB2.2 and splayed valve lifter patterns
• Can be machined to accept any small-block Chevy cylinder head
• Machined as 4.400" bore and main centers, can be machined to 4.500" bore centers
• Shorter than production pushrods required
• Tested to over 800 horsepower!
 12480050
283 Main, 350 Bore Size Medium-Deck Bowtie Race Block
• CNC Cast iron competition block designed for drag racing, road racing or restricted oval track racing!
• 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains
• 8.700" deck (standard deck block are 9.025"), can be machined to 8.500" deck height
• Camshaft is raised 0.433" to 4.955"
• Cam bearing bores machined for 2.250" O.D. x 1.875 roller bearings
• 3.980" rough bore
• 4.190" max bore (minimum of .250" cylinder bore wall thickness) (siamese bores)
• Integral oil restrictors
• Must use Big Block water pump, must raise water pump with adapters for balancers larger than 6"
• Standard Chevy V-8 bell housing bolt pattern
• Lifter holes and cylinder head bolt holes are not drilled
• Will accept standard, SB2.2 and splayed valve lifter patterns
• Can be machined to accept any small-block Chevy cylinder head
• Machined as 4.400" bore and main centers, can be machined to 4.500" bore centers
• Shorter than production pushrods required
• Tested to over 800 horsepower!
 12480045
283 Main Size NASCAR Busch Series Block
• CNC-machined, cast iron NASCAR competition block
• 9.025" deck height
• 4-bolt NASCAR-block specific steel mains, 17 splayed caps on center 3 mains
• 4.116" rough bore
• 4.185"
max bore (siamese bores)
• Machined for 2.280" cam bearings
• .875" lifter bores
• -06AN water drains
• 45 -10AN front oil feed and valley scavenge
• AN O-ring pipe plugs
• (4) Center lifter valley drains (drilled & tapped)
• Steam holes drilled between cylinders .750" below deck surface
• 1/2" NPT water hole on each side of block
• Dry sump only (no oil filter boss)
• Tested to over 800 horsepower!
 12480046
350 Main Size NASCAR Busch Series Block
• CNC-machined, cast iron NASCAR competition block
• 9.025" deck height
• 4-bolt NASCAR-block specific steel mains, 17 splayed caps on center 3 mains
• 4.116" rough bore
• 4.185" max bore (siamese bores)
• Machined for 2.280" cam bearings
• .875" lifter bores
• -06AN water drains
• 45 -10AN front oil feed and valley scavenge
• AN O-ring pipe plugs
• (4) Center lifter valley drains (drilled & tapped)
• Steam holes drilled between cylinders .750" below deck surface
• 1/2" NPT water hole on each side of block
• Dry sump only (no oil filter boss)
• Tested to over 800 horsepower!
12480097
283 Main Size NASCAR SB2.2 Series Block
• CNC-machined, cast iron NASCAR competition block
• 9.025" deck height
• 4-bolt NASCAR-block specific steel mains, 17 splayed caps on center 3 mains
• 4.116" rough bore
• 4.185" max bore (siamese bores)
• Machined for 58mm roller cam bearings
• .875" lifter bores
• -06AN water drains
• 45 -10AN front oil feed and valley scavenge
• AN O-ring pipe plugs
• (4) Center lifter valley drains (drilled & tapped)
• Steam holes drilled between cylinders .750" below deck surface
• 1/2" NPT water hole on each side of block
• Dry sump only (no oil filter boss)
• SB2.2 Lifter pattern and lobe sprayers
• Tested to over 800 horsepower!
 12480098
350 Main Size NASCAR Busch Series Block, SB2 Lifter Pattern
• CNC-machined, cast iron NASCAR competition block
• 9.025" deck height
• 4-bolt NASCAR-block specific steel mains, 17 splayed caps on center 3 mains
• 4.116" rough bore
• 4.185" max bore (siamese bores)
• Machined for 58mm roller cam bearings
• .875" lifter bores
• -06AN water drains
• 45 -10AN front oil feed and valley scavenge
• AN O-ring pipe plugs
• (4) Center lifter valley drains (drilled & tapped)
• Steam holes drilled between cylinders .750" below deck surface
• 1/2" NPT water hole on each side of block
• Dry sump only (no oil filter boss)
• SB2.2 Lifter pattern and lobe sprayers
• Tested to over 800 horsepower!
GM PERFORMANCE PARTS
R0X RACE block
The new GM small-block R0X V-8 engine package is the next evolution in the design of the Chevrolet small-block. It has been successfully raced in ARCA & the Baja 1000. The design incorporates wider 4.500" bore centers for improved engine architecture. The R0X package has dedicated components to take advantage of the spread bores such as cylinder heads, intake manifolds and other aftermarket parts. These parts can be purchased from your local GM Performance Parts dealer. Specialty parts can be purchased from aftermarket suppliers.
See chart on page 166 for complete specifications.  GM Performance Parts R0X Block Technical Note:
• CNC-machined, Cast iron competition block
• 7/16" Priority main oil system
• 9.025" deck height
• 4-bolt R0X-block specific SAE 4140 doweled steel mains
• 17 splayed caps on center 3 mains
• Center main thrust
• 4.166" rough bore (siamese bores)
• 4.250" max bore (min .225" wall thickness)
• 4.500" bore and main spacing
• Special cylinder head bolt pattern, 3/8-24 UNF threads
• 68mm (2.677") cam bearing bores for 60mm roller bearings
• Cam tunnel is closed (no oil drain to rotating assembly)
• Cam tunnel raised 1.572" to 6.093"
• .835" lifter bores (1.06 max.) 42 intake, 52 exhaust, can be relocated
• Cam lobe squirter provisions
• Piston squirter provisions, not machined
• -06AN water drains
• AN O-ring pipe plugs
• (4) Center lifter valley drains (drilled & tapped)
• Steam holes drilled between cylinders .750" below deck surface
• Dry sump only (no oil filter boss)
• Oil pan rails spread to 10.61"
• Front motor mounts only
• Dual starter mounts
• Tested to over 800 horsepower!
25534453
283 Main, R0X Series Block SB2.2 Lifter Pattern
• CNC-machined
• SB2.2 lifter pattern for P/N 88958667 cylinder head
25534452
283 Main, R0X Series Block Gray Iron
• CNC-machined
• Can be machined for standard, SB2 and splayed valve lifter patterns
• No lifter holes
  22551788
Cast Iron Rocket Block (Standard Deck With Wet Sump)
The Rocket Block was designed to be raced. GM Performance Parts has already done most of the precision machining for you, and The Rocket Block still retains a 0.245" wall thickness when you take the bore out to 4.180". That lets you go to some outrageous cubic inches (450+ cubes) from a smallblock that makes sick power and stays together in competition.
• Precision CNC-machined (+/- 0.001") cast iron competition Rocket Block
• 9.025" deck (min 0.625" thickness)
• 4-bolt SAE 8620 20 splayed main caps on center 3 mains (2-bolt steel front and rear mains)
• Camshaft raised .390" to 4.912"
• Uses big block cam bearings (no small base circle cams here!)
• 3.986" rough-finished extra-thick siamese bore
• 4.180" max bore (min .225" wall thickness)
• Standard 4.400" bore spacing
• Can run up to 4.125" stroker crankshaft for big power
 • Oil pan rails are spread .400" per side for extra stroke
clearance (special oil pan required)
• Bottom of bores and oil pan rails may require notching with large strokes for connecting rod and counterweight clearance
• 350 main journal size
• Priority main wet sump oiling system (remote oil filter only)
• Two-piece crankshaft seal
• Dual starter mounts
• Bosses for side and front engine mounts
• Fuel pump mounting boss
• Tested to over 500 horsepower! 
ALUMINUM RACE block The GM Performance Parts aluminum race block offer you the same competition-level strength of our cast iron race block, with the added benefit of reduced weight. This allows your chassis builder to put together a more balanced racecar while not sacrificing any strength under the hood. The GM Performance Parts aluminum race block come CNC-machined, made from our special super-tough aluminum, and ready for battle. If you want to go around corners at 200 mph or make over 1000 horsepower with a fuel-injected, turbocharged combination, this is your starting point.*
See chart on page 166 for complete specifications. GM Performance Parts Aluminum Race Block Technical Note:
• These block are CNC’d to +/-.001" machining tolerances!
• Cylinder decks, front and rear of case, oil pan rail surfaces and head dowel pins are blueprinted!
• 2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843 required at all five locations
• Cam bosses are enlarged to allow machining for the use of larger bearings
• Extra thick main bearing bulkhead machined at 5
• Premium quality main studs & SAE 8620 steel main bearing caps
• Billet wet sump rear main cap can be adapted to dry sump with plugs
• Priority main oiling system
• 2-piece rear-main crankshafts & pre-1986 oil pans required
• Extra thick deck surfaces with blind-tapped head bolt holes for improved head gasket sealing
• Centrifugally spun cast iron cylinder sleeves
• These block may require clearancing the top of lifter bores
(.842" diameter) for some roller lifters
• Timing system clearance should be checked before engine assembly
• Oil dipstick holes are not drilled  10185075
350 Aluminum Bare Block
• CNC-machined, A -356 aluminum competition block
• Increased wall thickness with siamesed bores
• 3.986" rough finished bore
• 4.150"
max bore (siamese bores)
• 350 main size
• Tested to over 800 horsepower!
 10134400
400 Aluminum Bare block
• CNC-machined, A-356 aluminum competition block
• Splayed 4-bolt steel mains
• Increased wall thickness with siamesed bores
• 4.117" rough finished bore
• 4.150" max bore (siamese bores)
• 400 main size
• Tested to over 800 horsepower!
CYLINDER BLOCK COMPONENTS 12363238
Universal Engine Lift Brackets
• Designed to bolt to the end of cylinder heads for removal and installation of the engine
• Made from 0.200" steel and have .88" x 1.00" hook slots
• Use with 3/8" or 7/16" bolts
• Includes two brackets and two 7/16" bolts  88891749
Freeze Plug, 1-5/8" Brass
• Corrosion-resistant brass freeze plug is recommended for marine applications
10121044
Rear Oil Seal,Two-Piece Design (not shown)
• Rear oil seal for V-8 and V-6 engines with pre-1985-style two-piece oil seal design
• Used by many NASCAR teams for superior leak protection  12480004
Cylinder Sleeve (Standard)
• Standard-bore steel cylinder sleeve for new-design aluminum small-block V-8 and 90 V-6 aluminum block, including P/N 10134400, P/N 10134351 and P/N 10134371 Sleeve has 3.980" bore and can be overbored to 4.125".
12480018
Oil Galley Plugs, Aluminum block (not shown)
• Replacement oil galley plugs for all GM aluminum engine block, size AN-6
 12495500
Freeze Plug & Dowel Pin Kit
• For all Chevy Gen I-, and II-style small-block V-8 and 90 V-6 engines
• Includes eight brass freeze plugs, one cam plug, six oil hole plugs, four head dowel pins and one camshaft dowel pin
 14011072
Billet Steel Four-Bolt Main Cap
• Outer holes are angled toward the oil pan rails, tying it to the strongest part of the block for greater strength and reliability in competition engines
• Reduces distortion of the main bearing bores
• Cap is machined from 1010 cold drawn steel, with the Chevy Bowtie insignia laser-etched on top of the cap
• Designed for block with 2.45" main bearings
Consult Chevy Power manual P/N 24502488 for machining instructions when installing splayed caps on block originally equipped with two-bolt or production-style four-bolt caps.
Block must be align-bored after installation of replacement front bearing cap. 94666814 NEW
Nodular Four-Bolt Main Cap (not shown)
• Upgraded cap used for 383 engines
• Straight bolt design, cannot be used on block originally equipped with splayed bolt pattern 14011052
 Billet Steel Two-Bolt Front Bearing Cap
• Replaces the gray iron front bearing cap on small-block V-8 and 90 V-6 block with 2.45" main bearings
• Machined from 1010 cold drawn steel and uses the same bolts and studs as the production front bearing cap
Block must be align-bored after installation of replacement front bearing cap.
12499102
Main Bearing Kit, 383 Engine (Standard)
• Complete main bearing kit for 383-cubic-inch small-block V-8 with standard-size mains 12499138
Main Bearing Kit, 383 Engine, +0.010 (not shown)
• Complete main bearing kit for 383-cubic-inch small-block V-8 with +0.010 -undersize mains  12480108
Main Bearing Bolt Kit, Sportsman block
• Sturdy main bearing cap bolts designed specifically for the following GMPP Sportsman racing block:
P/N 12480047, P/N 12480049, P/N 12480157,
P/N 12480159, P/N 12480174 and P/N 12480175
• Bolts are grade 8 with 12-point heads and black oxide-coated
Front Covers and Timing Pointers  3991435
Timing Pointer, 6.75" & 7" Balancer
• Steel timing pointer bolts on to engines with 6.75" or 7" balancers
• Pointer is not chromed
3991436
Timing Pointer, 8" Balancer (not shown)
• Steel timing pointer bolts on to small-block with an 8" balancer
• Pointer is not chromed  12342089
Small-Block Chrome Timing Cover
• Attractive chrome cover for 1969 –1991 small-block V-8 and all 90 V-6 engines
• Direct replacement for covers that use bolt-on timing pointer
• Supplied with GM oil seal. (Replacement oil seal
P/N 10111769.)
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