Thread: Backfiring.
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Old 06-30-2016, 09:07 PM   #14
TJ's Chevy
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Re: Backfiring.

Quote:
Originally Posted by jdl71 View Post
Sorry for the hijack, but this might be relevant to the OP. When you changed to HEI did you also change to a hotter plug? I assume you upgraded to 8mm wires also?
On my 305 V6 with a 4 barrel, I stayed with stock type NGK plugs and stock type wires and installed a pertronix. Hardly if Ever pops on deacceleration now.

On my 292 with a 600 cfm edelbrock I installed an HEI, Napa 8 mill wires and 1 step hotter on the plugs.

The 305 V6 has been burning the fuel without issue so I haven't seen the need for bigger wires or hotter plugs.
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