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Old 05-08-2007, 11:05 PM
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Choosing a plug heat range

I'm building a vortec 383 and I'm trying to decide which heat range plugs to put in. I was thinking putting in plugs 1 step colder than stock to start and if they foul then go one step hotter.. Is this the regular procedure? Or do most people just run the oem plugs?

I plan on running only on 87 octane gas if that matters.

sbc 383
vortec heads
9.3 to 1 compression
XE262 camshaft (218/224)
performer rpm intake and edelbrock 600 carb
manual transmission

autolite 605 (5) is the stock heat range for vortecs
I was thinking of trying 104 (same plug but 1 steps colder)

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Last edited by fiscus; 05-08-2007 at 11:18 PM.
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Old 05-09-2007, 08:13 AM
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go as hot as you can without detination. If it pings step it down.
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Old 05-10-2007, 07:12 AM
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Quote:
autolite 605 (5) is the stock heat range for vortecs, autolite 605 (5) is the stock heat range for vortecs
I was thinking of trying 104 (same plug but 1 steps colder)

GMs always run plugs hot, I would recomend going with a 103 first and if they foul out, go with the 104.

also, once you find a heat range that works, invest in some autolite XP style plugs, I run them and they last a long time. they are easy on the ignition system too, because they use less voltage to do the same job.
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