The use of billet main caps and rear seal adapters ensures that your crank is securely attached to the block and will not flex when used with hardened studs/bolts, available in standard or splayed outter bolt holes

On Line Performance Parts

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Oliver Main Billet Caps/Kits and Rear Seal Adapters

Manage bottom end stress and flex with the strongest precision milled billet steel main conversion cap kits available.   Available in either 2 or 4 bolt configurations, 10 degree splayed or stock style bolt holes, with either a 1 or 2 piece rear seal rear main cap available.

Eagle Chevy Small Block Nodular Iron 4 bolt main caps

Finding OEM 4 bolt blocks in Junk yards now a days, running from yard to yard, going through pile after pile, and then finding out that the block is not usable due to a crack or some other flaw after you just spent money on hot taking and inspections can be a pain, this kit converts any  305/350 2 bolt Chevy Small Block to a 4 bolt block with these cap kits, Have your machine shop drill and tap the extra holes, install the new caps, and line bore the block to ensure proper fit and alignment.   Kit includes 3 main caps and 6 hex head bolts.

Gellner

Precision CNC ground Billet Main caps for small and big block Chevys.

LaPouttre Racing Products

Extreme Value billet steel main bearing caps, 3 pieces in a set

Extreme Value Aluminum Rear Seal Adapters

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LaPouttre Racing Heads / Engines

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