sparkplugs, gaping

For a 1980 vette what is the sparkplug gaping? aso have light cam and elderbrock avs650 carb. Does it make a difference ?frstvette2007-05-22 08:58:39

The gap should be .35

 This spring when I tuned my 73 up I put those E3 plugs in. So far I really like them. The are a bit more but seem to work really well. Give them a try.

Pretty sure the later C3s with HEI ignition use plugs gapped at .045. I know all 78/79s are .045.

gap on my 75 with ac platinum plugs is listed at .060. it does have hei ignition. ossw1--- .035 sounds like the gap for distributors that have points. electronic ignition has higer gaps.

The EARLY HEI systems did have really large gaps, .060"
They found out that wasn't really good for the coils...too much heat involved. The later cars went to a tighter gap, at .045"
That being said, in 1979, I did a tune-up on a friends truck, a '79 Cheby, with over 100,000 miles(he were a Whiskey salesman...). He had a slight miss at idle, but that was it. When I pulled the plugs, I were shocked(no pun intended). There were absolutely NO side electrodes AT ALL on any of the sparkle plugs. NONE! The plugs were just completely worn smooth out, but the truck ran fine!! That was a real eye-opener for me, as far as the HEI systems. I figured if his truck ran that good with no electrodes, then the system must be pretty good.

This was the problem with the larger gaps, tho...it would eventually just arc away the electrodes. The smaller gaps allowed the plugs to survive longer, as well as reducing the amount of heat build-up in the coil.

Go with the .045 gap on your '80 car...