Spark Plugs ?

[DONTGAF]

Can anyone tell me what is the best spark plug to use in an "86" GM 5.7L/260 with Thunderbolt IV ignition?

Ron

 

[rbh]

Re: Spark Plugs ?

try an ngk br6fs or ac delco mr 43t?
rob
what kind of sea ray do you have?

 

[Bondo]

Re: Spark Plugs ?

Ayuh,... AC Delco, MR43T....