How do I go about determining what my spark plug gap should be? I have a 383 heads and cam(10.5:1 comp)...The cam is a 240/240 595 595 112, and its got a set of fully ported AFR's. The car is an m6...Thanks guys this will really help me...

 

I think (someone please come in here on this) the stock gap is .55. Im not sure how to calculate the what gap you need with your heads and all.

 

actually, I think it's .45

 

Stock gap =.050.Go with that.Or higher if you have an aftermarket ign.system.

 

thanks guys, i am going to gap at .55 being that i have th MSD ignition. Thanks for all your help guys!