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10-11-2010, 04:53 PM
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set timing on chevy 454 with HEI
Hey guys,
Im new to the site, just got back from afghanistan a few months ago. I wanted the get something I could work on, so I picked up this 71 nova with a 454. The car seem sto idle well and starts off driving fine, but when I try to speed up it bogs out and back fires. I am assuming it is because I am losing spark or timing is off. Any suggestions? 
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10-12-2010, 03:59 PM
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Here are a few things to consider.
When was the last time the carb was rebuilt? Check the fuel filter and replace if dirty. Check the distributor cap for cracks. Get a timing light and verify ignition timing. Hope this helps, BT
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10-12-2010, 06:51 PM
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ok the carb has just been rebuilt, so i know thats good. I have never really messed with the timing on a car before, where is it supposed to be? I am not sure what the HEI distributer is even out of. I dont really know to much about the motor, is there a site you can run crate motor numbers on to find out where it came from and the specs? Oh and a fuel leak almost caused me to burn the car down today!! I think I am just gonna pull the motor and rebuild it from ground up just so I know what im working with.
Last edited by 71Nova454; 10-12-2010 at 06:57 PM.
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10-12-2010, 07:48 PM
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Before you rip into the motor you need to determine what is wrong. Some simple tests can be done to eliminate certain potential problems.
A compression test revels many things like burned valves or worn compression rings. A vacuum test also can help diagnose the problem. Of course the routine things that were already mentioned need to be done. The history of the motor won't help at all as the info cannot be trusted. vicrod
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10-12-2010, 08:06 PM
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ok thanks, I really appreciate all the help guys. Question, the vaccum connection on my distributer should connect to where? also how do I adjust timing on a HEI distributer? The army has me on a very demanding schedule in between deployments, so I am going to rely on the info you guys give, so thanks much.
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10-12-2010, 08:14 PM
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Here is an old post I found that may help you out.
454 Ignition Timing Question To check initial timing you remove the vacuum line and plug it at the vacuum source. The vacuum source can either be above the throttle plates (ported vacuum) or at the intake manifold. I don't know which way it is on Chevys. Wish I could be of more help but I am a Pontiac guy.  BT
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