Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - I have stock Gen IV 454 & 781 Heads, Compression ????
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Old 11-26-2011, 05:03 PM
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I agree with the above posted reply. Plus you will need more pieces in the heads. Stock 781 heads have VERY short installed heights. After all they are truck heads. If you have larger intake valves installed. Get +.100 long and required retainers and locks/shims.. The exhaust side can use stock length valves with some sort of rotator eliminator (spacer). Your spring spec. did include installed height. Usually 1.875" on a mild big block.. Shorten the guides and cut for decent seals.
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