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Thread: SBC with vortec heads and thumpr cam timing/carb questions
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Old 01-12-2013, 06:45 PM
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cobalt327 cobalt327 is offline
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Quote:
Originally Posted by tcarlx View Post
keep the info coming people. The Rhoads lifter choice was for my father. He had them in his old camaro and he asked me to put them in my setup. I agree that it hurts my build and have thought about replacing them. I will try your timing suggestion Greg T. As far as issues. The truck runs and drives, its just has a shutter/shake in cruise mode. I have eliminated the possibility of trans due to enriching the fuel intake but then it over fuels at idle. I could tell you tons of details on where I have been with this and what makes me think its timing and carb but I'm sure noone really wants that. So my main issues is either over fueling to the point of gas in oil and/or I have a shutter/shake in cruise mode. Still would like to hear more timing suggestions.
Start w/22 degrees BTDC and work up or down from there, limit the total to 32 degrees all in by 3000 rpm, sooner if it'll take it w/o detonating. More here.

Use a vacuum advance limited to 10-12 degrees, use ported vacuum. Add vacuum advance if the engine likes it.

Be sure the timing marks for TDC are accurate.
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