Chevy Small block V8 SMALL- BLOCK CYLINDER HEADS Part Description Casting Material Port Port Valve Chbr Int Exh Exh Plug Heat Rocker Notes Page Number Number Size Type Angle CC's Vlv Vlv Port Type Riser Stud Number
12480092 Camel back 3991492 Iron 157 — 23 64 2.02 1.60 — Straight Yes Screw-in Bare, discontinued N/S
88958692 Camel back 3991492 Iron 157 — 23 64 1.94 1.60 — Straight Yes Screw-in Leaded 12480092, discontinued N/S
10159552 Gen II 141010837 Iron — — 23 64 1.94 1.50 — Straight Yes Press Bare 10125377 N/S
or 1409621
12363287 LT4 12555690 Alum 195 — 23 54.4 2.00 1.55 LT4 Angled No Screw-in For LT1 or LT4 182
12480034 Bowtie Phase III 12480034 Iron 184 — 23 64 2.02 1.60 Angled No Screw-in Phase 3 Bowtie 179
12497186 Fast Burn 12367713 Alum 210 Vortec 23 62 2.00 1.55 LT4 Angled No Screw-in Bare 12464298 N/S
12464298 Fast Burn 12367713 Alum 210 Vortec 23 62 2.00 1.55 LT4 Angled No Screw-in Assy 183
12556463 ZZ4 10088113 Alum 163 — 23 58 1.94 1.50 LT4 Angled No Screw-in ZZ4 Assy 181
12529093 Vortec 10239906 Iron 170 Vortec 23 64 1.94 1.50 LT4 Straight No Press Bare 12558060 N/S
or 12558062
12558060 Vortec 10239906 Iron 170 Vortec 23 64 1.94 1.50 LT4 Straight No Press Assy 178
or 12558062
25534351 SPVB 25534351c Iron 185 Vortec 23 66 2.00 1.55 LT4 Straight No Screw-in Bare 4421 N/S
25534371 LPVB 25534371c Iron 215 Vortec 23 66 2.00 1.55 LT4 Straight No Screw-in Bare 4431 N/S
25534421 SPVB 25534351c Iron 185 Vortec 23 66 2.00 1.55 LT4 Straight No Screw-in Assy 180
25534431 LPVB 25534371c Iron 215 Vortec 23 66 2.00 1.55 LT4 Straight No Screw-in Assy 180
24502580 18 degree semi 10134363 Alum 215 18 deg 18 60 — — 18 deg Angled No Shaft No seats/guides 184
24502615 15 degree 10134363 Alum 210 18 deg 15 35-37 — — 18 deg Angled No Shaft No seats/guides 184
12480129 SB2.2 12480011 Alum — SB2.2 SB2.2 48 2.15 1.625 SB2.2 Angled No Shaft No seats/guides 187
12480011 SB2.2 bare 12480011 Alum — SB2.2 SB2.2 48 2.15 1.625 SB2.2 Angled No Shaft No seats/guides 187
88958667 R0X SB2.2 88958667 Alum — SB2.2 SB2.2 28 2.15 1.625 SB2.2 — — Shaft No seats/guides 187
12480146 Rough bare splay 10185040 Alum — Splayed Splay 45 2.20 1.65 Splayed Angled No Shaft Rough mach 24502517 185
12480147 Semi mach splay 10185040 Alum — Splayed Splay 45 2.20 1.65 Splayed Angled No Shaft Semi mach 12480146 185
24502517 Splayed valve 10185040 Alum — Splayed Splay 45 2.20 1.65 Splayed Angled No Shaft No seats/guides 185
12480153 R0X splayed 12480153 Alum — Splayed Splay — — — Splayed — — Shaft No seats/guides 186
88958684 R0X splayed 12480153 Alum — Splayed Splay — — — Splayed — — Shaft Rough mach, no seats/guides 186 Overhaul Gasket Kits 88958693 NEW Rebuild Gasket Set (Non-Vortec) • Fits 350HO and Circle Track engine P/N 88958602
This kit includes the following items:
10105117 2 Head Gaskets
10108676 1 Oil Pan Gasket Set
12555771 1 Crankshaft Rear Main Seal
89017465 1 Intake Manifold Gasket Set
10105135 1 Water Outlet Gasket
10108435 1 Front Cover Gasket
12560223 1 Fuel Pump Adapter Gasket
12603957 2 Water Pump Gaskets
10108445 1 Distributor Gasket
10046089 2 Valve Cover Gaskets | 88958694 NEW Rebuild Gasket Kit (Vortec) • Fits ZZ4, Fast Burn 385, HT383, ZZ383 and Circle Track engines P/N 88958603 and 88958604
This kit includes the following items:
12557236 2 Head Gaskets
10108676 1 Oil Pan Gasket Set
12555771 1 Crankshaft Rear Main Seal
89017465 1 Intake Manifold Gasket Set
10147994 1 Intake Manifold Gasket Set
10105135
1 Water Outlet Gasket
12560223 1 Fuel Pump Adapter Gasket
12603957
2 Water Pump Gaskets
10108445 1 Distributor Gasket
10046089
2 Valve Cover Gaskets |
|
CYLINDER HEAD GASKETS & HEAD BOLTS
GM Performance Parts cylinder head gaskets, cylinder head bolts, and cylinder head studs are the finest quality parts available to ensure a secure seal between the engine block and cylinder heads. Note:
Gasket packages contain one gasket unless otherwise specified. Order two per engine. Small-block cylinder head gaskets are available in a variety of materials and thicknesses. Keep in mind your engine’s intended usage and minimum pistonto- head clearance when selecting gaskets.
A. 10105117
Composition Head Gasket
• Composition head gasket with stainless steel fire ring
• For stock or mildly modified engines with
4.00" cylinder bores
• Fits cast iron or aluminum heads
• 0.028"
compressed thickness 3830711
Steel Shim Head Gasket (not shown)
• For stock and mildly modified engines with
4.00" cylinder bores
• 0.026" compressed thickness
12557236
Composition Head Gasket (not shown)
• Stainless steel fire rings
• Fits aluminum or cast iron heads
• Used on ZZ4 and 350 HO engines
• 0.051" compressed thickness B. 10185054
Heavy-Duty Composition Head Gasket
• Teflon-coated
• Pre-flattened wire O-rings around each cylinder
• For competition engines with cylinder bores of 4.00" to 4.125"
• 0.041" compressed thickness Drill steam holes when used on 400-ci smallblock. Gasket does not require re-torquing. C. 12363763
Special Competition Head Gasket
• Teflon-coated, heavy-duty composition gasket
• Pre-flattened steel fire rings and 4.200" bore
• For Bowtie, 400 small-block, and aluminum block with cast iron or aluminum heads
• Revised coolant hole pattern
• No steam holes for production 400 engines
• 0.038" compressed thickness | 
