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Re: 400/406 Builds
Flat tops will build some serious compression in a 400. You really need to know the cc's of the reliefs and how far down the deck the pistons go along with head gasket thickness. In HS I had a warm 400 that had hyp flat tops and 76cc iron heads that ran detonation free on 87. The only issue was intermediate dieseling at shut off. Tighter heads will shoot the compression really quick, especially with a zero deck height. Don't forget that hyper piston are not very tolerant of detonation so stay conservative on the timing curve and add some till it runs the best.
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