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Is there a threshold in modding where spark plug gap should be reduced from factory ?



Yes, at some point there is a need to reduce the gap because it can be blown out.

You'd be at a pretty high power level to be needing to run anything under a .050 to .055 gap.
 
Roughly around the point where the supercharger turns into a turbocharger.

Or you're running a nasty blower setup/nitrous and need to close the gap some to prevent blowout.

Light mods no need to mess with gap at all.
 
What gap would you guys recommend for a build with XP Cam, Double Roller, Stage 2 ported heads, Gen v, 3.0 pulley, SD Headers, lQ4 MAF, FS I/C?
 


i wouldnt recommend it to anyone to be like me, but when i was running smaller pulleys i just gapped it at 0.045" and stopped caring.
 
close the gap if you start to misfire or lean it back out until it stops misfiring.

I run down to a 025 gap on the cheapo plugs to keep my turbo setup happy, so you can do it if you want.. it doesnt really hurt.
 
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