Spark Plug Suggestions

[gr8vet]

OK, I admit, I am a looser, I have searched and read all I can find about spark plugs and I am more lost than before.

New engine build, compression under 10, 350 CI, mild cam, GM iron heads. Engine cam with r45ts plugs, which I think means resistor,14 mm, 5 heat rating, extened tip. What the heck is the difference in heat rating numbers, up or down + / -? With my setup do I need the 5's or go higher? I do ALOT of cruising in slow traffic, not much hotrodding around, and would like to keep plugs from fouling. Also need a couple of shorty plugs due to headers? I have come across ACCEL shorty's with no flipping clue what the heat ratings are. Any help about this mystery subject would be great. tt

 

[mrvette]

Accell plugs are overpriced....

having said that, your numbers 45ts is fine....but if you stick a X on the end of it, it seems to me that the shank up top is somewhat shorter than the others...

now I remember finding something for my iron heads like with looking for a shorter shank to help with header clearance...and the difference was the X on the end, the rest of the plugs were identical far as I could see....

they worked fine...but I forget if they had the gasket/compression rings, or the tapered fit trick....

but in that case AC DID make a shorter shank plug....

 

[gr8vet]

THanks my friend! tt