Quote:
Originally Posted by Dragncar
The 390 HP 428 was the highest rated factory HP of any Pontiac in the muscle car era. The 1970 D port 64 head 455 was rated at 370 HP. The RA IVs were close to that also.
They are all under rated. But its still sad that 390 HO 48 headed 428 with dished pistons never made it into a GTO or Firebird. And they all had cast rods, just sad. And we never got a 455 with real compression and real cam either.
Pontiac always had one hand tied behind their back.
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Yes PMD had constraints, yet PMD knew enthusiast were well practiced in Compression and headers. Swiss Cheese