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Originally Posted by CJ428CJ
I don't now about cast iron heads but this is not true for Edelbrock heads. I have a 428 bored .030 and I'm running Edelbrock heads with 2.19 intake and 1.75 exhaust valves. The cam lift is .609 on the intake and .622 on the exhaust.
Chris
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30 over may be enough clearance for the big valves. For a std 428 bore it is in fact true, trust me.
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