Which spark plugs?
I'm finally putting my 4.2l back together, and am looking for the best spark plugs to use. It's got a 4.0l head, it's been Nuttered, and has the large Ford cap & rotor. It had Bosch Platinum FR9HP, but I'd like to make sure I'm getting the hottest spark my ignition system is capable of producing. Are the Bosch good to stay with, should I use the Denso APP985s like my 2000 TJ took, or something else? Thanks.
'90 YJ w/4.2l & 4.0l head, Weber carb, 5-speed, 4" RC lift, 33x10.5x15 BFG MT KM2s.