It looks like the ngk 94201 B58 spark plugs would be a good match for this setup. It’s a step colder and the dimensions are identical to the 97506. Plus the terminal is flat.
Would be interesting to see if it we can run the 94201 stock gap (0.75mm) with the B58 coils @ 25 psi.
Would be interesting to see if it we can run the 94201 stock gap (0.75mm) with the B58 coils @ 25 psi.