About to begin my rebuild. Input needed

Iron heads with race gas is no problem I'm talkin about regular unleaded street use blocks running on 92 octane and how did I shatter the pistons was in wot with as condition at 5400 rpms wit the timing at 39 then boom lean wit a lot of timing caused that blow up less than 500 miles on the block

You ran too much timing, it was lean, your EGT's went sky high, you popped pistons.

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Originally Posted by pushrod4life

Iron heads with race gas is no problem I'm talkin about regular unleaded street use blocks running on 92 octane and how did I shatter the pistons was in wot with as condition at 5400 rpms wit the timing at 39 then boom lean wit a lot of timing caused that blow up less than 500 miles on the block

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Ok, I'm just having a hard time understanding how a faulty secondary linkage could cause a lean condition. If it wasn't opening, it would be acting like a two barrel carb, which wouldn't cause it to lean out.