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· Super Moderator
8,623 Posts
Discussion Starter · #1 ·
most sbc factory heads will allow a lift of about .470 with the factory springs and clearances, a few will allow up to .530, but the only way you can be sure is to verify clearances, I see guys install new high lift performance cams using the factory springs and never verify the clearances then they are amazed when things go badly

using a valve spring micrometer and measuring spring bind helps verify clearance

the result of not verifying valve train clearances,full lubrication and valve spring load rates

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