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Old 03-24-2009, 09:24 AM
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Hard Starting SBC

The 355 SBC in my Late Model Stock Car is very hard to start. Once I get it started it runs great, but until then it's an exercise. I'm running a Holley 650 4150, Edelbrock RPM Intake. Initial timing is 16 Deg and no vacuum advance. Any help would be appreciated. Thanks

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Old 03-24-2009, 09:39 AM
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Can you discribe in detail. Does it crank slow, or will not engage right away? Is the motor cranking for a while before it fires up?
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Old 03-24-2009, 10:27 AM
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Hard Starting SBC

The engine cranks at normal speed, it will run for about 2-3 seconds and then quit. The engine will do this several times and continue to run for longer periods of time until it finally stays running. Sometimes it will do a slight backfire through the carb. I've checked the timing once it's running and it's fine. I run an HEI, new plugs and wires, rebuilt the carb with new proform main body and throttle plate. I've checked P-valve. Idle vacuum is 8 inches. Motor has break-in time only. Thanks
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Old 03-24-2009, 10:37 AM
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It dosent have a choke anymore.thats the trade out when running the proform center section. theres nothing wrong with it its just cold natured. if you have every thing set correctly it will be like mine, the first thing I do when its cold it to pat the gas two to three times then hold pedal about half way down while turning the key. motor should start. It will stumble a few times but just keep the rpms about 1600 to 1800 for a minute then let it idle for a couple of mins. dont try to rev it because it will just fall on its face. this is the same thing I have to do with all my engines with no choke. just be patient with it.
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Old 03-24-2009, 10:43 AM
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Quote:
Originally Posted by zeromod
The engine cranks at normal speed, it will run for about 2-3 seconds and then quit. The engine will do this several times and continue to run for longer periods of time until it finally stays running. Sometimes it will do a slight backfire through the carb. I've checked the timing once it's running and it's fine. I run an HEI, new plugs and wires, rebuilt the carb with new proform main body and throttle plate. I've checked P-valve. Idle vacuum is 8 inches. Motor has break-in time only. Thanks
your vacuum is really low... idle vacuum in drive for normal should be around 12-15... i would recheck the timing correctly and check your carb for any leaks... also i hear the edelbrock's aluminum intake give a hard start
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Old 03-24-2009, 11:30 AM
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The reason it stalls, You have the choke wide open. You must have the choke working. Is it electric or manual? Either way, You need the choke to work. On the electric there is a High idle and a low idle adjustment screws. You need the high idle to operate during cold condition. It's even worst with a high performance cam. Judging from the vacuum you got. It sounds you have a pretty large cam. I have two 390 holley's on my tunnel ram setup. The rear carb has the choke. My car would stall and backfire during cold idle if the choke not used. Hope this will help you.

Last edited by lg1969; 03-24-2009 at 11:49 AM.
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Old 03-24-2009, 11:59 AM
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Chuck75 you nailed it. That is the exercise I go through as well. No choke is a problem. I am running a big cam, and that is the spec idle vacuum. Thanks to all, for the replies.
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