| |
Click on image for the lowdown. 
====
| | |
7 members (MickeyP, Rusted Nut, Steelonsteel, 5 Window 9434, Dennys28, Southerntruck, mick53),
91
guests, and
3
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,043 Posts1,055,612 Members48,426 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#61386 06/06/2006 10:13 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | I just checked the vacuum on my rebuilt 261 and fiddled with the timing, and got only a mas of 15 inches. I thought it was due to the 3/4 cam or dual carbs, or leaky gaskets or bad valves.
However, after checking all that I talked to a friend and he said that engines produce less vacuum at altitude. Where I live is about 5,500 feet above sea level. My friend said its about 1 inch per 1,000 feet. He said 15 inches is good here and it would be 20-21 at sea level.
Has anyone else heard this?
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
| | |
|
|
| |
