My buddy in Chicago's 86 442 with a Q-jet 403 will do 12.50's all day long using the cruise and AC on the way to the track and back. They frown upon the AC condensate on the track, so he has to turn it off during runs.
307 to 403 OLDS
- Thread starter TURNA
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A stock 403 short block and early 330 or 350 heads is an easy 9 to 1 recipe but the heads flow better on the exhaust side. Very interested in this upgrade. I always found the early 307's acceptable, if not good for their time. Nearly everyone who complained about the later swirl port heads.
The Olds 307 is an excellent engine for what it is any year.
Great reliable little engine
Great reliable little engine
Is it in yet?
That's what she said!
Turna will probably have that 403 in his Cutlass long before I get the 403 in mine. 🤔
I doubt it
Its a fresh rebuild buy a shop I never dealt with. So I have to dissemble it and check everything or I will never be at ease with it
Its a fresh rebuild buy a shop I never dealt with. So I have to dissemble it and check everything or I will never be at ease with it
Agree 100%. I don't just run Olds V8's to be different. They were much more durable than the sbc till the mid 80's.
Turbos. Displacement on demand.
A perfect candidate for a head swap down the road. I would swap the lame 186/200 .400/.402 cam and degree it. Good luck.
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