Motor Backfires Thru Exhaust When Trying To Start

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10-01-2019, 08:16 PM

Jim Coleman Jim Coleman is offline

CC Member

Join Date: Jun 2003

Location: Waco, TX

Cobra Make, Engine: 1980 Arntz, 350 'Vette & Muncie, & Jag rear

Posts: 219

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Motor Backfires Thru Exhaust When Trying To Start

The 350 chevy engine that came with my Arntz is giving me problems.

I was told it is a rebuilt 70's 350 with a 30-30 solid lift cam.

I brought it up to tdc , and ran the plug wires according to the firing order.

Tried to start it and it is backfiring thru the exhaust. The new 1980's Holley
started leaking gas, so I removed it and installed a 750 Edelbrock that I know
was a good carb as I took it off a running engine.

My question is this: I was told that backfires thru the intake are usually ignition related and that backfires thru the exhaust are usually fuel related.

I haven't tried to start it with the Edelbrock on it yet, thought I'd get some guidance here first.

Thanks,

Jim

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