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Re: First motor start, terrible knocking
I don't know about the differences between those two head castings but could it be the rockers are binding with the valve rotators? That's an angry sounding noise. It stands to reason the only changes made were the head exchange so this noise should be related to the heads.
How is the oil pressure?
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Boog
69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
primer is finer
91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said.
I stand for the flag and kneel at the cross
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