need spark plugs gt 40 heads

gpp · 04-30-2006

i bought a set of cast iron gt 40 heads and dont know what size or heat range spark plugs to run.motor is a stock 88 gt mustang.can anyone help me please?

GhostDog 5.0 · 04-30-2006

I would use Autolite #764 gapped at 0.054

gpp · 04-30-2006

hey,thanks alot.so many heads out there so i thought i better ask.

Young_Buck · 05-01-2006

I agree with GD.

Autolite is one of the best copper plugs to buy out there, most Mustang users swear by them.

I bought them and love them.