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These newer style caps are manufactured from alloy billet steel on C.N.C. machining centers. A great fit every time. This alloy steel provides superb strength with ease of honing. Material stock is left in bore (.030) to accomodate off center bores and seats. Line boring and honing is required. Bearing tang notches are machined on the caps. Register (step) on caps are machined to fit tight in stock bulkhead seats. On splayed caps, the outer bolt holes are angled towards the oil pan, fitting the cap to the strongest part of the block, thus improving reliability in high stress racing motors. Angled bolt holes also reduce main bearing bore distortion by increasing the cap’s resistance to closing up under high stress conditions.

Caps Are Slotted For Easy Removal
SB Repl. Main Cap - MSC100S
Set of 3 intermediate caps with bolts and drill bushing. Four-bolt cap replaces O.E. cast or nodular iron. Fits small block Chevy four bolt block with 2.45 journal dia. Bulkhead seat register 6.200.
SB Rebuilder Main Cap - MSC101S
Set of 3 intermediate caps with bolts and drill bushing. Four-bolt conversion cap with straight outer holes, convert two bolt block to a heavy duty four bolt block. Fits small block Chevy with 2.45 journal dia. Bulkhead seat register 4.486. Great for truck applications, preferred by production engine rebuilder's for it's ease of installation
Track 400ci Main Cap - MSC103S
Set of 3 intermediate caps with bolts and drill bushing. Splayed four bolt high performance cap converts two bolt Chevy 400ci to four bolt motor. Has 18 angle on outer bolt holes. Fits all 2.650 journal dia. bulkhead seat register 6.200.
SB Performance Main Cap - MSC102S
Set of 3 intermediate caps with bolts and drill bushing. Splayed high performance cap converts two bolt to four bolt racing application. Has 22 angle on outer bolt holes. Fits small block Chevy with 2.45 journal dia. bulkhead seat register 4.486. Use with performance front cap, Part #[[MSC104]:product=MSC104].
SB Front Perf. Main Cap - MSC104
One front cap per box. Two bolt performance cap replaces stock front cap on small block Chevy 2.45 journal dia. bulkhead seat register 4.486. Use with Part #[[MSC102S]:product=MSC102S].
GM Repl. (Alum. Block) Main Cap - MSC105S
Set of 3 intermediate caps with bolts and drill bushing. This splayed performance four bolt cap is a direct replacement on all Chevy aluminum performance blocks with journal dia. of 2.45. Replacemes GM Part #14011072. Has 12 angle outer bolt hole, can also be retrofitted on all cast iron blocks. The block bulkhead seat must be machined to fit stock two or four bolt blocks. This cap is preferred by performance rebuilders for its wide range of applications and can be fitted individually to each...
BB Chevy Performance Main Cap - MSC107S
Set of 3 intermediate caps with drill bushing. Splayed four bolt performance cap converts big block Chevy two bolt to four bolt, straight outer hole. Fits 2.75 journal dia. bulkhead seat register 7.130.
Main Cap Drill Bushing - MCB100
Used for Silver Seal Main Caps.
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