02-25-2020, 09:21 PM

hurryinhoosier62 hurryinhoosier62 is offline

Ultimate Warrior

Join Date: May 2006

Location: Floyd Co., IN/SE KY

Posts: 4,076

Quote:

Originally Posted by Stan Weiss

If under square was the way to go why did Pontiac use the Olds 403 - 4.351" x 3.385"?

Stan

Stan, you are making this too easy. It was already EPA and CARB certified for CA and high altitude areas. The Pontiac 350 and 400 were NOT. Look at the cam specs, carb jetting and ignition timing of the 403s. Then, consider the 403 had an air pump, catalytic convertor and was designed to burn unleaded fuel.

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