Back to basics... spark plug gap?

Hi All,
Just had to clean up some mildly-fouled plugs (old gas and lot's of idling), and thought I'd regap them.
Reading through this site, I see many, many different suggested gaps. I read that with MSD boxes, gap should be changed. I also read that a test of different gaps had no resultant change in HP.
So, there's a lot of variation for perhaps not much outcome.
So, I turn this to you all for your opinions.
I've been gapping my plugs at .030
I've got a 10.4:1 505" RB with E'brock heads, a 0.587/0.593 287/294 cam, M1 intake and 1050 Dominator.
MSD 6AL box, MSD Blaster 2 coil, MP distributor and NGK BCP6ES plugs.
For street and strip, what would you gap them at?

Cheers!

i set mine at 35 gas / 40 alcohol

35 is fine, might try on heat range higher, if there are no signs of other problems.

My 440 with MSD and 12.5 domes, 1050 Dominator and Stealth heads I run .040.Its street driven and no problems.My sons 413 with MSD same gap.I run NGK plugs and they seem better than the Autolites I was running.Rocky

I think for the most part all a wider gap does on a NA engine is work the ignition system and wires harder.

I seen a car a few years back that wouldn't run with a .040 gap and was fine at .035..

I run mine at .035 on gas and tightened it up to .030 when I put alky on it.

Blower, turbos and NOS are a different story.

NGK's @ .035 right out of the box....MSD-7AL2

Rickster

sorry should have said i run 35 on gas / 40 on alcohol but i change the plugs for alcohol, heat range is diff and alcohol being more violent, i change the gap
hi rick hows the car comming along ? are you done yet??

Quote:

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Hi All,
Just had to clean up some mildly-fouled plugs (old gas and lot's of idling), and thought I'd regap them.
Reading through this site, I see many, many different suggested gaps. I read that with MSD boxes, gap should be changed. I also read that a test of different gaps had no resultant change in HP.
So, there's a lot of variation for perhaps not much outcome.
So, I turn this to you all for your opinions.
I've been gapping my plugs at .030
I've got a 10.4:1 505" RB with E'brock heads, a 0.587/0.593 287/294 cam, M1 intake and 1050 Dominator.
MSD 6AL box, MSD Blaster 2 coil, MP distributor and NGK BCP6ES plugs.
For street and strip, what would you gap them at?

Cheers!

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The wider the better - as long as your ignition system is up to the task of lighting them. I'd go for .040"