G'day all
I'm running a ZZ502, and have been fouling plugs in it for years. I've used both Bosch and NGK.
The NGK's I've used are the 5s, 6s and 7s.
I've found other zz502 owners have the same issues, but no one has really solved the problem. Has any one on here fixed it?
Its a stock motor with an Edelbrock 850 - vac Secondarys.

I need to sort out what plugs, but also why they're fouling in the first place.

Cheers