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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,078 Posts1,056,027 Members48,433 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | The thought had been that the Offy was a better street manifold, because of smaller runners. The smaller runners provide better low end, and mid range torque. Recent dyno tests on a 292 indicate that this may not be the case, for the 292. There are dyno tests in the planning stages for the 250, but it will be a few months before the data will be available. IMO the Offy would still be a safe bet for the 250 if your not looking at high RPM.
Larry
I don't own a vehicle that isn't old enough to drink.
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