MSD plug gap

[72ScampTramp]

I have a 440 and MSD street fire box. MSD says .040-.045. and stock is .035 Do I wanna start out on the low side?



Rule of Thumb Plug Gap
COMPRESSION GAP
UP TO 10.5:1 .040 - .045
10.5:1 - 13:1 .032 - .040
OVER 13:1 .025 - .032

 

[bad440]

got mine set at 40.prob gonna set them at 35 for nitrous use.