- Home »
- Catalog »
- Crate Engines and Builder Kits »
- Crate Engine Builder Kits »
- Aftermarket Block
Aftermarket Block
Pontiac V8 Aftermarket Block
Where Pump Gas Meets 700 Horsepower — Aftermarket Block for Pontiac V8s
When the target is 600 horsepower or more on pump gas, a forty-year-old factory casting stops being the sensible foundation. These Crate Engine Builder Kits are built on the aftermarket IAII block at 505 to 535 cubic inches, with the bore, main webs and cam tunnel to support it.
Butler specifies them complete — machined block, forged or billet crank, Eagle rods, Ross pistons, ported Edelbrock heads, COMP roller camshaft, Canton oiling and FAST or Holley EFI — and ships them unassembled for you or your builder.
Browse Aftermarket Block Products
Popular Brands:
More About Aftermarket Block
1. The two power levels
Both kits share a bottom end. What separates them is the cylinder head and the camshaft style, which is where the power actually comes from at this level.
| 600 to 700 horsepower | Edelbrock 340 CNC ported heads with Ferrea valves, a Butler valve job, springs, 10 degree retainers and locks and 7/16" studs. Camshaft choice is open — flat tappet, hydraulic roller or solid roller. |
| 700 horsepower and up | Edelbrock Wide Port heads, ported, with the same Ferrea valve and Butler valve job treatment. Camshaft is hydraulic roller or solid roller only, because a flat tappet is not the right tool at that level. |
| Both | 505 to 535 cubic inches, naturally aspirated, on pump gas. |
2. The shared bottom end
The rotating assembly is specified for the IAII block rather than adapted to it.
| Block | IAII, sonic tested, completely deburred, bored and honed with a torque plate, line honed, deck squared, cam bearings fitted, with main studs. |
| Crank and rods | forged or billet crank at 4.250" to 4.500" stroke on a 2.200" rod journal, with Eagle 6.800" rods and ARP 2000 bolts. |
| Pistons and rings | Ross pistons by Butler at 4.350" bore, any compression ratio available, on Ferrea .990" by 2.930" pins with Total Seal Classic Race rings. |
| Bearings and balance | Clevite or Federal Mogul race rod and main bearings, balanced internally. |
3. Induction, oiling and the lead time
The rest of the kit is specified to match: Butler billet timing gears and chain, roller rockers, Butler pushrods, a Butler aluminum valley pan, Canton oil pan, Butler Pro oil pump with a heavy duty drive shaft, performance damper, timing cover, water pump, intake and your choice of FAST or Holley EFI, with an EFI tank solution available if the car still has a carbureted tank.
Not sure what your Pontiac needs?
Email our tech team at tech@butlerperformance.com. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.