Herb

What do most people gap their
Double platinum plugs at with forced induction? 5psi

383tpimachine

93?

Mine are gapped to 25 but I will have 18 or so lbs on 93+meth

LT1inaMGB

I have mine at .035" running 8 psi and an MSD 6A and it works fine to 6000 rpm.

BlowerWorks

Hi Herb - The bigger the gap the better !!! Why do some engines have 2 plugs per cylinder ?
The real question is what gap can you fire up to what RPM ? And that depends on your set-up. A distributor style engine on an 8 cylinder engine has limitations that can be met by reducing the plug gap or adding a CDI module - and on and on and on ! lol
greg