I really don't think your losing any power with that dual plane. People have made over 800Hp with GM OEM dual planes. This larger should support at least 850Hp
SMALLER 538 in with ported GM dual plane, 831Hp.
https://www.chevelles.com/threads/ho...-plane.354314/
Mine didn't make 800Hp, but we think the stock 1969 "052" alum block is the issue there.
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