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#1
06-09-2026, 09:47 PM
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76 455 Head Help
I am ready to send off my 455 for a rebuild. Originally with a 7.6 CR, I plan on swapping heads.
I have a set of 1973 #46 heads and a set of 1976 #6X-4 heads. I've seen two different cc sizes for the #46. Wallace lists them as 96.17 cc's, Butler lists them as 89 cc's. Any idea which is correct? Most sources show the #6X-4 as 93.74 cc's. I would like to use the Butler 068 HR cam, but am afraid the cr might get too high for a 212 cam. Will either head work? If not, would the Butler 224/230 HR help the issue? Car has the original 3.23 gears and ST10 Four Speed. Using original intake and q-jet. Switching to ram air exhaust manifolds and dual exhaust with cross-over, if that matters.
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69 Firebird Conv, 350 HO w/3 on the tree swapped to Tremec 5 Speed - Sold 72 GP, 400 Auto - Sold 09 G8 GXP M6 Orig Owner - Sold 76 Trans Am 455, 4 Speed - Current |
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