Thin wall castings
Thne 289/302/5.0 blocks are "thin wall castings". That's great for light weight, but is not good for more than .030 or .040" at he most over bore.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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