swinger340
Well-Known Member
10.5:1 340. Eddy closed chambered heads w a solid flat tappit cam. What is recommended for spark plugs? Thanks for any help.
Was thinking about going w a cooler plug like Champion RC9YC or Autolite 3923. Anyone running cooler plugs?
What would you recommend I gap these ?My 408 with 10.3-1 and edelbrock heads is running the RC12YC's since(believe it or not ) '09.No troubles and sees 6500 rpm regularly.That should be '06 not '09.
What would you recommend I gap these ?