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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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| | | | Joined: Jan 2005 Posts: 112 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2005 Posts: 112 | 327, good compression. Just replaced timing chain, starts idles good. Tried every tuning trick i know. Runs the same as before chain swap. No popping back, very dead on bottom end, acts like low vaccum.Runs good after up to speed, but seems like you have to "ride" it all the time. This used to be a real go getter. Has my cam played out? | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | What is the vacuum reading at a steady throttle setting, maybe 2,000 RPM in neutral? If it's under 18 inches of mercury, you've got the timing chain one tooth out of time. A quick way to check this is to take the passenger's side valve cover off and watch the #6 cylinder valves as you turn the engine over slowly. The exhaust valve should be closing, and the intake just starting to open, as the timing mark aligns with top dead center. (0 degrees). I'm going to predict that the intake valve will be open way too far as the TDC mark lines up, from the cam being one tooth late on the timing chain alignment.
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: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | X2 - sounds like the cam is retarded. | | |
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