standup303
Well-Known Member
Went to replace my plugs today with the NGK ZFR5N and they are a good bit longer than the Champions I pulled out. Are the NGKs the incorrect plug? This is for a 225 slant 6
Awesome thank youThey are correct and will fit and work fine. The electrodes are longer, yes, but will not hit anything. If you're installing these in a '63-'74 head, remove the metal ring washers first.
PS: I haven't tried them on a 170 engine, but I would be careful, as the piston comes up to the top of the block, and MIGHT hit the plug. 198/225 engines do not have this potential problem.