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You've noted that our 400 uses two-bolt mains. Our engine builder, Jun Nakawatase, pointed out that four-bolt-main 400s are actually weaker than their two-bolt brethren, since the extra bolt runs through the thinnest part of the cap and the block casting. We used ARP main studs for maximum strength.
Chevy Small Block Dyno Tests - Old School Meets New

You've noted that our 400 uses two-bolt mains. Our engine builder, Jun Nakawatase, pointed out that four-bolt-main 400s are actually weaker than their two-bolt brethren, since the extra bolt runs through the thinnest part of the cap and the block casting. We used ARP main studs for maximum strength.  View Related Article

 

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