Proper spark plug gap?

[MisterB]

1980 350 V8. Standard plugs, cap and rotor.

What should I set them to?

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[Frankenchevy]

Stock head, ignition, etc I want to say .035

I’m at .060 with my current setup, but I’m pretty sure I’m remembering that correctly.

 

[Chevyguy]

1980 350 V8. Standard plugs, cap and rotor.

What should I set them to?

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Should be listed on the emission sticker that's either on the air cleaner housing, or the top radiator mounting plate. My 87's by the radiator.

Clayton

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[hunters628]

I just make sure there is actually a gap on the plug and I call it good. Lol. No noticeable performance difference in properly gapped plugs so what’s the point. That’s how I do it on all my rigs. Learned that trick from a vw engine builder of 40+ years.

 

[Frankenchevy]

There’s absolutely a difference in plug gaps. Try running my gap on a turbocharged engine. Compression, flame front, timing, ignition strength...there are a ton of variables. I guess on a 160hp 8:1cr v8 it may be a wider window, but at least you’ll get longer plug life and more complete combustion.

 

[PrairieDrifter]

I gap at .045

 

[Dan Miller]

Ive had alot of mine come preset at .045 . I use AC - R45TS in my stock 350 2bbl ,, seems to do fine for me

 

[Chevyguy]

Looking online .045 seems to be the recomended gap for your 1980 HEI motor.

Clayton

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[Dysco]

Gap certainly does make a difference. The wrong gap means you aren't burning all the fuel, and/or at the right time, which means you are giving away horsepower, torque, and spending more at the pump. It's a factor in the timing and performance of any engine.
Generally with a stock 350sbc,h and carb, .35 is reccommended. An aftermarket hei and/or injection is often 45.

 

[MisterB]

Gap certainly does make a difference. The wrong gap means you aren't burning all the fuel, and/or at the right time, which means you are giving away horsepower, torque, and spending more at the pump. It's a factor in the timing and performance of any engine.
Generally with a stock 350sbc,h and carb, .35 is reccommended. An aftermarket hei and/or injection is often 45.

I would agree. If an engine doesn't care about the spark plug gap, it must be running really poorly in other areas.

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[78C10BigTen]

I have pre gapped E3 in my tired ol dog so idk.... lol

 

[C10MixMaster]

.035 for points distributor .045 on HEI . i have no problem bumping that to .060 on an HEI

 

[Snoots]

I gap at .045

X2

 

[1973c10]

.045 on HEI
X3