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07-18-2006, 05:42 PM
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horse power
I have a 350 4 bolt main bored 30 a 510 dur 530 lanati cam
12 to 1 top domed pistons 300 horse heads valved and seated for cam a weiand intake and a 750 eldebrock carb. a hammer head crank a msd firing box and accel distributor accel distributor cap and accel wires and the valves are chattering any suggestions. 
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07-18-2006, 06:51 PM
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valve chattering
Are you running racing gas? or at least fuel additive. If not it might be firing too soon. You are running alot of compression you need to run a hi octane gas. also if your doing all of this already try moving the timing. hope this will help Grim
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07-18-2006, 07:43 PM
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what size vavle spring
i hope you got some stout springs for that cam if not check the piston for holes from the vavles hitting the pop up pistons
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07-19-2006, 06:21 AM
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how can you have 510* dur. when there is only 360* in a circle?
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07-19-2006, 08:36 AM
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Are there 360* in a circle or 360° in a circle?
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07-19-2006, 08:45 AM
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What kind of fuel are you using? With a 12 to 1 compression ratio you will have pre-detonation if you do not mix or use the right fuel.
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