Quote:
Originally Posted by pa140flyer
b-man what do you recommend for forged rods? The one reason I was after running 87-89 octane isn't because it is cheaper but because I plan on driving this car on long trips a lot and the way things are going I was concerned about even getting 91 octane fuel! I know I am probably being paranoid! What is your opinion on CR for 91 octane?
Rar_421 How far are you on your 350 build and what company are you dealing with to get parts?
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Nothing wrong with being a bit conservative with compression when you might be stiuck using 87 or maybe even 85 depending on what state you’re traveling through. Your 8.7 to 8.9:1 should be fine in that case. Somewhere between 9 and 9.25:1 would be pretty safe I’d say.
I built my 421 HO at 8.8:1 intending to run 91 octane premium. However my car is a heavy and highly optioned Le Mans convertible with factory A/C, automatic transmission and a 2.56 rear end so it’s a bit less octane tolerant than a lighter weight 5-speed stick shift hardtop GTO.
Forged rods in whatever price range you can afford are available at most any established Pontiac parts vendor like Butler’s or even through one of our forum members Paul K (Paul Knippen) who also builds some nice engines as well.