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Old 07-09-2005, 08:29 PM
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383 tuning

Hi, I just got my 383 running and now I am trying to tune it. It has 10.5:1 compression, xe-274 cam, msd ignition, etc. When I try to time it I cannot get it to go to zero without the motor dying. In fact, advancing at all will backfire trough carb and die. It will only run with timing retarded. Is this normal? Any suggestions on helping me time my car?

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Old 07-09-2005, 08:48 PM
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Nope it`s not normal, what balancer are you using? make sure the balancers outer ring hasn`t moved. are you sure you have the correct timing marks? are you sure it was timed correctly?
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Old 07-14-2005, 09:25 PM
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I am using the correct balancer, I checked the timing mark and it is right on the money, I am about 98% certain the timing was set correct. I don't really know how to check that out. I asked a guy at my work and he said to bring it up on #1 TDC and look at the intake valve to see if it moves. I did this and both the intake and the exhaust don't move when coming up to TDC of #1. No matter how much I tune the carb or try to adjust the timing, it still likes it retarded and continues to backfire through the carb when I hit the gas. Someone please help me out? I cannot figure this out. Any ideas will help out a lot. Once again it is a chevy 383 with 10.5:1 compression, AFR 195cc heads, xe-274 cam, msd pro billet ready to run distributor with a blaster SS coil. I tried to check my vacuum and it reads a steady 9" of vacuum at idle. When I disconnect the vacuum advance and plug it off to adjust timing, nothing changes. NEED HELP!!!
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Old 07-14-2005, 09:32 PM
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Are you turning the dizzy counterclockwise to advance the time? you should be. often a backfire is a sign of a lean mixture or retarded timing.
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Old 07-14-2005, 10:19 PM
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Yes I am turning the dist. counterclockwise to advance. The exhaust smells like it is running very rich. I cannot get it to run very well at zero or advanced.
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Old 07-14-2005, 10:23 PM
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did you degree the cam? it sounds like a leaky intake valve or a cam off center. {or rockers too tight}

You need to run a compression check on all eight.
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