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Engine Rebuilder Kits
Pontiac V8 Engine Rebuilder Kits
Pick The Block, Pick The Depth — Engine Rebuilder Kits for Pontiac V8s
Engine Rebuilder Kits take the guesswork out of a Pontiac bottom end. Instead of chasing a ring set, two bearing sets and a gasket kit across four part numbers, you pick the block you have and the depth of the job, and the parts arrive already matched to each other.
Butler groups these by block, from the 326 and 350 through the 389, 400, 421, 428 and 455. Each group carries re-ring kits, full rebuild kits with pistons, and Butler short block kits and assembled short blocks.
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More About Engine Rebuilder Kits
1. Start by choosing your block
Nothing on this page crosses between block families. Bore sizes, main journal sizes and stroke all change, so the first decision is which casting is on the stand.
| Small bore | 326 and 350 kits, sized to the narrow bores those blocks run. |
| 3.00" main blocks | 389 and 400 kits, the most heavily stocked groups Butler carries. |
| 3.25" main blocks | 421, 428 and 455 kits, which share a journal size but not a bore or a stroke. |
2. Then choose how far you are going
Butler builds these in four depths, and the right one depends on what the block measures and what the engine is for.
| Re-ring kit | Rings, rod bearings, main bearings and a complete engine gasket kit with rear main seal and oil pan gasket options. For a block with good bores that just needs a freshen. |
| Rebuild kit | Adds pistons and pins to the above, in cast hypereutectic or forged, in your overbore size. Butler publishes estimated compression ratios against common chamber volumes so you know what you are getting before it ships. |
| Custom short block kit | A prepped block plus a complete internally balanced rotating assembly, shipped unassembled and ready for you or your shop to put together. |
| Assembled short block | The same package built by a Butler engine specialist, on a reusable engine cradle. |
3. What the Butler Process means on a short block
Every Butler short block goes through the same machining sequence. Blocks are cleaned, magnafluxed, sonic tested and completely deburred, then bored and honed with a torque plate, line honed with ARP main studs, deck squared, and fitted with cam bearings and brass freeze plugs. The rotating assembly is internally balanced, the rings are file fit and the bearings are performance rod and main sets from Federal Mogul or Clevite.
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.