LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Gapping recommendations for a SC LT

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Old Mar 1, 2014 | 04:13 PM
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Default Gapping recommendations for a SC LT

I've read so many different suggestions that my head is spinning... Some guys say boosted should have larger gap and some say close it...

Vortech manual suggests factory heat range and gap (this is that manual written 10+ years ago) but when I was purchasing some parts from them 2 different techs said to do 32-34 and that I could even drop a heat range.

The plugs I pulled were gapped at 70-75! Center electrodes were worn down but color looked good (probably why gap was high??). Also what is the best way to close the gap? I've always just pushed the ground electrode against a hard surface but a neighbor flipped on me and said I needed to buy a gapping tool.???
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Old Mar 2, 2014 | 02:42 AM
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Bigger gap
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Old Mar 2, 2014 | 06:11 AM
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I got away with .035 on mine so if you are around there that should work fine. Some folks go a little tighter with higher boost but your sig says 7lbs so follow your techs advice. I would drop a heat range on the plug as well.
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Old Mar 3, 2014 | 11:20 AM
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Great thanks!
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Old Mar 3, 2014 | 11:32 AM
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Originally Posted by DUDCOUPE
Bigger gap
Oh Really? and he should go 4 heat ranges hotter too..
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Old Mar 3, 2014 | 01:02 PM
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So TR6 with .35 should be good?
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Old Mar 3, 2014 | 02:36 PM
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Originally Posted by moehorsepower
Oh Really? and he should go 4 heat ranges hotter too..
Sorry shoulda been smaller. My buddies gap on his blown motor is like .30
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Old Mar 3, 2014 | 04:53 PM
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Originally Posted by mhslax6
So TR6 with .35 should be good?
That is a good starting point. You will want to pull a couple plugs right after a WOT run to see where things are.
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Old Mar 4, 2014 | 06:28 AM
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I can tell you at 12lbs, I was blowing out the spark at 32, going 15lbs, I am squeezing it to 28.
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