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#1
10-14-2020, 07:09 AM
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428 ho talk
Let's talk about how in the world Pontiac gave the 1969 428 HO motor a 390 hp rating when the 1969 366 hp 400 RAIII manual trans motors atleast for the first half of the production run had more Cam and with the small chamber casting number 48 heads far more compression !
Also note that the then new 1970 455 in the A body cars where only rated at 370 hp with everything being the same but for the hp Exh Manifolds.
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