Just a question.I never hear anything about the 7h1's,but I see they are a 80cc chamber. I would think these would make a good 400 head seeing as how that would put you right in the mid 9's CR wise. You can convert to big valves and put in screw in studs,correct?
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride