spark plugs, changing heat range tips anyone?
I have a 73 Mustang that I just finished putting an engine in. It's a stock 302c.i. bottom end except for the piston rings and timing chain, but I went with a Summit camshaft .471 lift-218 intake and 228 exhaust duration at .050". I also went with a Performer 289 intake, Holley 600 carb, and a Mallory dual-point distributor. Can anyone give me possible pro's and con's to running either colder or hotter spark plugs?
[ February 17, 2002: Message edited by: dmorris1200 ]</p>