V-6 90 ENGINE BLOCK QUICK REFERENCE CHART
Part Number 10205294 25534333 10134371 10134351
Block Material Cast Iron Cast iron A356-T6 aluminum A356-T6 aluminum
Cylinder Wall Type Non-Siamesed Siamesed Siamesed Siamesed
Cylinder Deck Height
9.025" 9.025" 9.025" 9.025"
Cylinder Bore Range 4.000" 4.000-4.155" 4.125" 4.125"
Number Bearing Cap Bolts 2 4 4 4
Cap Bolt Orientation Straight Splayed Splayed (20 deg) Splayed (20 deg)
Bearing Cap Type Cast iron Cast nodular 8620 steel 8620 steel
Crankshaft Journal Dia.
350 size 350 size 350 size 400 size
Oil Sump Type Wet Wet Dry Dry
Crankshaft Seal Type 2 pc 2 pc 2 pc 2 pc
Design Max Stroke 3.75" 4.00” 4.00” 4.00”
Weight (lbs; bare) N/A 163 78 78
Intended Usage Amateur competition Professional competition Professional competition Professional competition
Non-Standard Parts Required Has fuel pump boss — No mechanical fuel No mechanical fuel pump boss pump boss V-6 90 ENGINE block 25534333
Sportsman V-6 Bare Block (not shown)
• Fully CNC-machined Bowtie block
• Nodular main bearing caps and Grade-8 bolts 10134371
Aluminum Racing Bare Block (350 ci Main Size) (not shown)
• Improved, new-design 90 V-6 A-356 aluminum racing block with 3.980" bores (maximum bore of 4.125")
• Will accommodate 4.000" stroke and can be built in displacements ranging from 3.0L to 5.2L
• Deck surface is 0.620" thick, with reinforced front and rear bulkheads
• Head bolt holes are blind-tapped to eliminate coolant leaks
• Four-bolt main caps are machined from 4340 chromemoly steel
• Block has an upgraded V-8-style oiling system
• Uses a two-piece rear main seal A. 10134351
Aluminum Racing Bare Block (400 ci Main Size)
• Has the same features as block P/N 10134371 (see above), except it has 4.117" bores, a 2.65"-diameter main bearing bore and a provision for dry sump oiling
• Maximum recommended bore is 4.130" 
V-6 90 CYLINDER HEADS QUICK REFERENCE CHART Part Description Casting Material Port Port Valve Chamber Int Exh Plug Heat Rocker Notes Number Number Size Type Angle CC's Vlv Vlv Type
Riser Stud
10134359 18 V-6 12480009 Aluminum 215 Raised 18 deg 43 2.15 1.62 Angled No Shaft No seats/guides
12480009 18 V-6 12480009 Aluminum 215 Raised 18 deg 43 2.15 1.62 Angled No Shaft As cast ports
 
V-6-90 CYLINDER HEADS
B. 10134359  
18 Aluminum Cylinder Head
• Low-port 18 aluminum cylinder head for maximum-effort competition engines
• Offers significant improvements over conventional head designs with 18 valve angles (vs. older 23 angles) and 43cc combustion chambers
• Spark plug holes are centrally located and valve centerlines are relocated
• Exhaust ports are high-flow
• Head face has an extra 0.080" of material for 9.1:1 compression, and up to 2.20" intake valves can be used
• Shallow wedge-shaped combustion chambers allow builders to achieve high compression ratios with small piston domes
• Heads do not include valve seats or guides
• Aftermarket shaft -mounted rocker arm assemblies and pushrods are required
• Piston domes and valve pockets must be matched to the revised combustion chamber design 12480009
18 Aluminum Cylinder Head (not shown)
• Low- port 18 aluminum cylinder head for competition engines
• Identical to P/N 10134359 (see above), except that it has a new design intake port for Daytona Dash Racing Series | 
