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Author Topic:   Big block ? small block ? think the techies will catch it ?
posted March 18, 2004 10:21 PM
in a pure stock class not sure a big block was available that year if not think the tech guys will catch it ? was the 403 olds a big or small ???

posted March 19, 2004 12:51 AM
It's considered a "medium" block by Pontiac. It came out in alot of rides, mostly '79-'81 TA's. Yes, it's an Oldsmobile engine, but corporate GM used it in a few other makes, too.

posted March 19, 2004 06:59 AM
403 is considered a small block. The stroke is the same as a 350 olds. The cranks, rods, bearings, cams and etc. all interchange with the small block olds'. Don't rev it over 5000 the bottom won't live without major help.

I ran one for 2 years and currently building one to replace my sbo 350

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