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Old 11-08-2010, 07:38 PM
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1970 396 is actually a 402. 375 hp version is a four bolt block with valve reliefs in the upper cylinder. Heads for 70 are 454 closed chamber. Rectangle port with 2.19 intake and 1.88 exhaust.. These are the rpm version of a big block, stock solid lifter cam will rev to 6500+. 11 to 1 compression. Flat low rise intake manifold. The same as the 70 Corvette. These engines originally had distributors that were modified to have vac advance only in high gear. The Holley carbs, tho the same specs as a 3310- 780 carb were rated for emissions as 450 cfm..
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