4.0l head swap with TFI ignition - spark plug question B Beaulac Jeeper Posts 28 Thanks 0 Location Regina Vehicle(s) '83 Jeep cj, 258, auto Apr 27, 2010 #1 I have a 1983 jeep cj and just completed the 4.0l head swap. I have the TFI ignition upgrade and am wondering what spark plugs/gaps should be used??
I have a 1983 jeep cj and just completed the 4.0l head swap. I have the TFI ignition upgrade and am wondering what spark plugs/gaps should be used??
Sasquach Crazy Sr. Respected Jeeper Posts 4,055 Media 35 Thanks 2 Location Santa Ynez, Ca. Vehicle(s) 1978 CJ5, 258 w/4.0head, Mopar MPI, P.S., P.B.,Tilt wheel, No stereo, t-18, t-20, amc 20, dana-30 w/tru-trac, Warn full float w/locking hubs & Detroit locker in the AMC. 1964 CJ3B, 4-134 1952 M100 trailer Apr 27, 2010 #2 Champion RC9YC at .040 or .045 with the E coil if memory serves me.