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Old 03-31-2003, 04:03 PM
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Post muffler explosion

Recently I rebuilt my 350 Chevy for my street rod.I'm having a problem with stalling at idle and muffler explosion. Timing is set at 15% inital and 35% total timing. If I back off on the advance then it back fires.
This is what I have in engine new parts.
350 4 - bolt .030" over
Keith Black pistons KB-119. .100" dome
Elgin cam .454"/480" gross lift 224@ .050 dur.
World sportsman II heads 2.020"/1.600" 72cc
Edelbrock RPM performer manifold
Holley street avenger carb. 670 cfm
Dynomax cerma coated headers
Mallory unilite distributor
Mallory pro-master coil
split fire plugs

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Old 04-01-2003, 12:57 AM
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Hey man i had the same thing on me falcon it turned out the carb was overfueling it acually ended up bloing one of me mufflers straight through the seem so i retimed it and jeted it and fixed it. good luck hope that helps
PS i personally wouldnt use those sort a plugs either noone here like them cus normally they one last a couple a blocks and then they r ded i use NGK Gold polidiums #7 on the heat range they seem to last me around 6-8 months im not sure if use have them there anyway good luck
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Old 04-01-2003, 04:45 PM
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The Smell of Nitro in the morn
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Check the float level, fuel pressure and you could be off one tooth on timing. When retarded it would backfire thru exhaust valve.
Luv the smell of NITRO in the morning.
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