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428 Super Stroker Rotating Assemblies
Pontiac V8 428 Super Stroker Rotating Assemblies
All the Stroke It Will Take — 428 Super Stroker Rotating Assemblies for Pontiac V8s
Super stroker is Butler's term for the longest crank a block will accept, and on a 428 that is a 4.500" stroke. It is the top of the 428 range and the point where the block is carrying as much stroke as a factory Pontiac casting reasonably can.
Butler builds a balanced 487-495 ci rotating assembly for the 428 block at that stroke, and Eagle lists a flat-top 495 ci 4.500" stroker kit for 428 and 455 blocks alongside it.
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More About 428 Super Stroker Rotating Assemblies
1. What is on this page
| Butler 487-495 ci, 4.500" stroke | A balanced rotating assembly for the 428 block, built around genuine Ross forged pistons on Butler's exclusive true-Pontiac forging with Total Seal rings, bearings selected for clearance and Butler Process internal balancing. The displacement is a range because it moves with the finished bore. |
| Eagle flat top 495 ci, 4.500" stroke | A fixed combination listed for 428 and 455 blocks, with forged 4340 rods, ARP 8740 capscrew rod bolts, forged Mahle pistons and file-fit plasma-moly rings. Supplied unbalanced, like all Eagle kits. |
2. What a 4.500" crank asks of a 428
This is the most demanding combination the 428 block sees, and the block gets checked before anything is ordered.
| Cylinder wall thickness | A 428 is a valuable casting and not endlessly reborable. Sonic check it before choosing a bore at the top of the range. |
| Clearance | Long-stroke Pontiac combinations need the block checked for rod and counterweight clearance. Mock it up rather than assuming the crank swings free. |
| Balancing | Every assembly must be balanced before it runs. Butler balancing weighs and pin-fits rods and pistons, computer balances the crank to the assembly, and ships a balance card. Internally balanced means a neutral flexplate or flywheel and a neutral harmonic balancer. |
3. Making the displacement count
| Compression | On the Butler assembly the piston is designed around your chamber cc and target compression ratio. Custom dish pistons run a 10 to 12 week lead time. |
| Top end | Nearly 500 cubic inches will out-breathe a stock port every time. Plan the heads, cam and intake with the assembly, not after it. |
If you are not sure whether your 428 should carry this much stroke, call before the machine work starts. We would rather talk it through than have a good block cut for a combination it cannot support.
Not sure what your Pontiac needs?
Call our tech team at 866-762-7527. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.