Parts for rebuild - Somewhat urgent - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-25-2005, 08:20 PM   #1
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Default Parts for rebuild - Somewhat urgent

Two questions:

First come the sparkplugs. If I am correct, the stock Autolite plugs for the L36 are #606. What are the corresponding Autolite numbers for one, two, and three heat ranges colder? We need an answer to this question tonight, so all help is appreciated.

Secondly, I've read through the thread about changing to an adjustable vacuum modulator for the 4T60E in order to firm up the shifts. I would like to know where that modulator is located in the engine bay, and also some part numbers for buying one from Autozone or O'Reillys.

Thanks in advance, and there may be more requests posted here throughout the night as we continue putting the motor back together!
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Old 11-25-2005, 08:34 PM   #2
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Not sure on the sparkplugs but here is the modulator:

and heres the aftermarket modulator box/instructions:
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Old 11-25-2005, 09:25 PM   #3
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Thanks Mike!

So you install it as per the "1986 and newer" TH-440?

Also, if anyone can give me info about spark plugs, it would be greatly appreciated. We NEED colder plugs before we can fire this baby up, so I'm going to have to find out one way or another before the night is over.

Thank you!
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Old 11-25-2005, 09:37 PM   #4
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I'm not sure how the 606s rate compared to 605s, but here'* a list that gets cooler towards the bottom;

Autolite 605
Autolite 104
Autolite 103

HTH

Cheers,
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Old 11-25-2005, 10:16 PM   #5
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Quote:
Originally Posted by MyLittleBlackBird
Thanks Mike!

So you install it as per the "1986 and newer" TH-440?

Also, if anyone can give me info about spark plugs, it would be greatly appreciated. We NEED colder plugs before we can fire this baby up, so I'm going to have to find out one way or another before the night is over.

Thank you!
Yep.
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Old 11-25-2005, 11:38 PM   #6
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Is all that green stuff in those pics coolant? It looks like a gatorade commercial!!
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Old 11-26-2005, 12:18 AM   #7
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Quote:
Originally Posted by maxpower9004
Is all that green stuff in those pics coolant? It looks like a gatorade commercial!!
No, if you would have read our other thread in performance and brainstorming, you'd see it is ectoplasmic goo!
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Old 11-26-2005, 12:32 PM   #8
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I'm curious as to why you want to change the heat range on the plugs. Are you drag racing?

If you're not, I'd keep the factory heat range.
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Old 11-26-2005, 12:48 PM   #9
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One reason is the higher compression. It'* over 10.1:1.
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Old 11-26-2005, 02:29 PM   #10
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Quote:
One reason is the higher compression. It'* over 10.1:1.
One heat range should handle that easily. I'd forget about 2 or 3 heat ranges colder unless you enjoy changing plugs often.

Since a supercharger essentially bumps compression, I'd go with the SSEi plug, if it'* different from the "K" engine plug, and stop there.
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