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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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Check the float level, fuel pressure and you could be off one tooth on timing. When retarded it would backfire thru exhaust valve.
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