Quote:
Originally Posted by 'ol Pinion head
Of the '70 Pontiac 455 big valve engines, only the stick coded engines had the S grind (068) cam. Have torn down too many originals, a WA, 2 YA's, a YC, & over a half dozen XF's with original cams. Have not removed the original cam from my '69 428 HO GP's XG engine, but am betting since its an auto code, it will also have the P cam.
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According to the Wallace site, the 69 428 HO looks similar to the 70. The 390 MT's got the 068 cam and the AT's the 067. However, it also says the 390 HO MT got the 48 heads and the AT's 62's.