| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,012 Posts1,055,317 Members48,419 | | 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!
| | | | Joined: Nov 2002 Posts: 2,763 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,763 | If the vacuum advance will not hold a vacuum, then I would replace it before looking for anything else.
You may have additional issues; but fix the one you know is bad, and see what happens.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Jan 2014 Posts: 3,677 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,677 | If the vacuum advance will not hold a vacuum, then I would replace it before looking for anything else.
You may have additional issues; but fix the one you know is bad, and see what happens.
Jon. X2 My engine ran like garbage until I figured out the vac advance was toast. I doubt that is THE issue here. But might as well just knock it off the list. If you can’t find a replacement right away, at least plug the port.
1951 3100
| | | | | Joined: Feb 2004 Posts: 29,743 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,743 | Putting a new vacuum advance on an engine with internal problems is like a doctor giving a patient aspirin for the headaches caused by a brain tumor. Go ahead and throw parts at the problem if you choose, but I'd "Test, Not Guess" like Sun used to promote. Disconnect and plug the vacuum line if you like, but I've never seen a bad vacuum advance keep an otherwise good engine from running well at low to medium speed.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2011 Posts: 814 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 814 | Trying to find one now. It may take a few days.
1956 Chevy 3200
| | | | | Joined: Sep 2011 Posts: 814 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 814 | If I can't run the engine long enough to do a hot valve adjustment, would a cold adjustment be acceptable?
1956 Chevy 3200
| | | | | Joined: Feb 2004 Posts: 29,743 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,743 | Yes. For the purposes of compression testing, I just snug the adjusting screw to eliminate any clearance, then back off 1/4 turn of the screw to assure that the valves get completely closed. Be sure the distributor rotor is pointed at the cylinder you're adjusting to be sure both valves are supposed to be closed.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | |
|
|
| |
