Yes, I see what you mean. I was referring to engines in general. I never want to guess with something that could potentially ruin an engine.

On the Stovebolt, you're saying that if the only part of the plug that's extended is the electrode/insulator and that the threads and seat are identical to the stock plugs, they'll be ok with no interference.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)