Thread: exhaust pipe diameter

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Keep your '64's 4:10 rear and use a 700R4 instead of the Turbo 350, I did that in my '65 I had, the lower first gear in the 700R4 made it launch much harder and the overdrive made it EZ on gas when cruising.With new HEI's selling for around $100 junk the stocker and get a new one with a better performance curve and higher voltage to work with your cam and intake.

You want to stay with 2.5" pipe mainly for the reason that you can buy flanges for 2.5". 2.25" is a bastard size but if you are going to run pipe that doesnt need a flange connection to the header then you should be fine.