they're all 4 bolters.... minus the 2 bolt canadian block... but thats the strongest nickel block i have and the webs are super wide... you can machine it to be a 4 bolt block with splayed billet caps and then it would be as strong as supermannnn
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1990 IROC-z28 Convertible ... best et (15.9 @ 86.7)
1970 Chevelle ls5 ... best et (13.97 @ 101.3)
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