307 to 403 OLDS

olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,752
113
Melville,Saskatchewan
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.
 
TURNA

TURNA

Geezer
Jul 24, 2009
8,197
113
Socialist NY
The Olds 307 is an excellent engine for what it is any year.

Great reliable little engine
 
TURNA

TURNA

Geezer
Jul 24, 2009
8,197
113
Socialist NY
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
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,752
113
Melville,Saskatchewan
What is supposed to be done to it?
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,752
113
Melville,Saskatchewan
The Olds 307 is an excellent engine for what it is any year.

Great reliable little engine
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.
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,752
113
Melville,Saskatchewan
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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