[Jay S]

Originally Posted by racerboy

Thanks Jay. Do I have to change valve springs if I go with the 62043 cam?


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No. Springs should be good.

Just my opinion, I would leave the early rods in the engine. They are not much different strength wise than a stock cast rod. We ran some in a 455 in the stock car photo that is my avatar for for a season and a half before we broke one. It was turning 6500 at the end of the straight on a 3/4 mile track. 4000 rpm through the corners. Going through the heats, sometimes both features, that was some serious abuse. Our mistake was we shouldn’t have ran them again the second season. Lol Personally I think the strength is a toss up between a newer cast rod and those old forged rods. The other Pontiac engines we did we ran cast rods and arp bolts and thru them in the recycle bin after each season. In a street engine with stock heads I would run them an not worry about it.