Quote:
Originally Posted by Jeff Lee
Maybe things have changed but I had great success with CP pistons turn around time, even on pistons not previously approved for Stock.
My Super Stock engine got a set of Diamond pistons in about three weeks (which do not require NHRA approval).
Along the lines of what Ed said, on some engines it can get real costly with rings if it is an odd size. My 390 AMC being one of them. I ran a 4.230" bore in Stock and I spent a lot of $$ on rings and spacers to run the 1.2mm width. It may be more cost effective to run a smaller bore if it is a more common ring size. All depends on if your after every hundredth in ET or not.
Now NHRA allows +.075 which is 4.240" for my 390. What that means to me is I can use a 4.250" ring package which will file down nicely. That gets me rings for a few hundred dollars instead of over a thousand dollars.
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Pardon my AMC stupidity, but a 4.23 bore is pretty big (thinking 427 Ford here) so what does that make the crank stroke to be 390 CI. No scientific information to prove it's any better but I've always liked the big bore/short stroke idea..