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Old 11-14-2003, 03:02 AM   #1
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K well my car usually runs un evenly at idel and resulting in poor mpg, a certified mechanic that my dad knows said that with these cars you MUST go with only AC delco plugs and wires, i have the cheap Delcos in there and cheapo wires 8mm, he mentioned something about the correct heat range, so okay what plug has the correct heat range for my car, also should i go with AC delco wires or MSD? 8mm or 8.5mm???
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Old 11-14-2003, 03:17 AM   #2
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I just posted some info from NGK (the maker of AC Delco Plugs) a few days ago. They told me with regards to heat ranges (talking about the NGK V-power plug which I'm addicted to):

On an unmodified L67, the proper heat range would be the TR55 V-Power.

On a Modified L67 (with regards to boost) use the TR6.

These are both copper plugs, which the L67 prefers. Don't use Platinums of any type, and not sure about Irridiums.

You should use the STOCK plug that GM recommends or the TR55 NGK V-Power in an un-modified L67.
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Old 11-14-2003, 03:51 AM   #3
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and if i have future plans for MSD coil packs? TR6?
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Old 11-14-2003, 03:53 AM   #4
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No. Coils don't make any difference in the plug you need. Only boost/other mods.
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Old 11-14-2003, 03:53 AM   #5
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Not need to go to TR6 if you plan on getting MSD coil packs. You only need a colder plug if you have a dramatic increase in horsepower. I wouldnt even get the coil packs unless you plan on modding your motor. Otherwise your stock spark & recommended plug is fine.
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Old 11-14-2003, 03:56 AM   #6
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I beat you!

To back this up and clarify:

BOOST levels are the #1 reason for needing to go with colder plugs. When you finish your pulley swap, intake, and exhaust, change to TR6 (or one heatrange colder of the plug of your choice).
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Old 11-14-2003, 03:58 AM   #7
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the amount of squeeze is what determines your heat range. defintly use prem. fuel.
if you go with a smaller pulley, chip, or anything like that, then go colder. cylinder pressures and timing are the main things to look at when to or not to go colder.
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Old 11-14-2003, 01:43 PM   #8
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FYI I have always used stock AC Delco 41-601 plugs, because I am Mr. Stock Man.

$.99 a piece.
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Old 11-14-2003, 02:25 PM   #9
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i belive thats what i have but my wires are cheap 8mm i paid like 20 bucks for 6 of em at Auto Value! lol
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