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Old 02-17-2002, 06:29 AM
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Question 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>
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