I have AFR 180's with the LPE 219 cam in a 355 with 9:1 comp. Does anyone have any quick ideas as to what plug to start with?? I got a # off the AFR web page, but it is not a part #???

 

If I hit the same page as you AFR recommends an AC FR3LS plug. That is a 5/8" hex, 3/4" reach, 14mm thread, FineLine Resistor plug with an extended tip:

http://www.acdelco.com/html/pi_plugs_ident.htm

A decent plug in the Autolight line would be the 3924.

RBob.

 

Do you think a FR5LS would be ok instead of the FR3LS?? I can't find anyone that carries FR3LS around here.

 

That is two heat ranges in difference. I don't know if that is a hotter or a colder plug. If hotter then pre-ignition may occur (bad). If colder then fouling may occur (not too bad).

For the L98 Aluminum headed Corvette engine the 3926 is the stock Autolite plug. The 3924 is two heat ranges colder. Equivalent to this is the NGK FR4 plug.

All of these are easy to get as they are stock in the Vette (3926) and the Sy/Ty's (3924/FR4).

RBob.

 

Thanks RBob, I found the proper plugs here finally.