Help with plugs.....

[TallyMan]

I am having a hard time finding plugs for my car now.. I just installed a procharger and want to go 1 step colder with my gt-40x heads. The stock plug for these heads is autolite 764. There is no such thing as a autolite 763, so what do I do ??? Anyone know what plug to try for 1 step colder, I would also use NGK or autolite.... Please help, i've tried searching the plug manufacturers sites with no real luck.

Steve

 

[N8Miller]

i can cross reference it at work tommrow. maybe the 763 turned into a new #.

 

[TallyMan]

That would be great, as i am having a hell of a time trying myself. If you could get me 1 step colder and 2 steps colder that would be great.

thanks
Steve

 

[cjman15]

get NGK iridium plugs

 

[TallyMan]

I am planning on the NGK, just cant get them cross referenced to a colder plug...

 

[TallyMan]

Ok heres the results. I just got off the phone with the NGK tech. For GT-40X heads:
1 step colder than factory is Part#TR6IX, stock#3689 (summit 7.99/ea)
2 steps colder is part#TR7IX, stock#3690 (summit 7.99/ea)
These are for the NGK Irridium plugs

Figured i would share the info.

Steve

 

[N8Miller]

or autolite 5143....

 

[TallyMan]

Thanks N8miller. Are those 1 step colder than the autolite 764's???

 

[N8Miller]

Thanks N8miller. Are those 1 step colder than the autolite 764's???

yep

 

[camarokiller5.0]

Sorry to bring up an old post but need to know what the num. for autolite sparkplug one step colder then the 5143, or two steps colder then the 764 for gt40 heads on nitrous Thanks!