correct plug?

[buzzman]

thanks in advance.....what is the best plug to use in a mildly modified 87 gn? I see that the "spring guide" calls for the r43ts for cars running around 13.50. this is one heat range cooler than factory plug. Is the 43 the best plug for my car? what are the advantages of running a cooler plug in this car? I pulled the originals (27000 miles) and they look real good, maybe burning a little lean. I want to make sure before i put a new set in.....I know you guys know. thanks

 

[salvageV6]

I'd go with the 43's.

CR43's have the larger ground electrode and are like normal plugs made in the old days.