I'm in the process of building an Olds 455 and was curious...
I know which spark plugs were originally designated to run in this motor, but this motor isn't exactly being built stock, on top of the fact that it's a marine motor now so it's gonna run a lot colder.
What I'm wondering is how do I know which heat range of plugs I should run in it? Here are the specs:
455 Olds punched .020 over
Elgin Pro Stock Cams -
.328/.328 SAE Duration (Int/Exh)
.244/.244 050 Duration (Int/Exh)
.475/.475 Valve Lift (Int/Exh)
.297/.297 Cam Lift (Int/Exh)
110/110 Lobe Centers (Int/Exh)
Holley 4150 750cfm Marine Carb w/mechanical secondaries
Edelbrock Torker 455 Manifold
Naturally Aspirated
Jon