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Old 05-21-2007, 07:18 PM   #11
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no I am buying a 1991 Olds the model is called a 98 the motor that is in it is a 91 L67 what I am trying 2 do is figure out what I should do with the pulley I can't tell how much boost I am making cuz it doesn't have a boost gauge
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Old 05-21-2007, 07:34 PM   #12
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get a boost gauge first. THats a start
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Old 05-21-2007, 10:30 PM   #13
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Techinfo will show you how you're making 7-8 psi stock by adding an aftermarket boost gauge. I wrote the article.

Then Techinfo will tell you what steps you need to go through to be able to decrease pulley diameter. There'* alot involved for a S1 L67.
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Old 05-22-2007, 03:51 PM   #14
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i looked through there today
very confusing
i was wondering if i could get some easier advice
you know straight from you guys
hell maybe you could dumb it down to my level of stupidness
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Old 05-22-2007, 04:13 PM   #15
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Did you read the article about cracked manifolds and fuel pressure?

How about you read it and post questions that you don't understand.
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Old 05-23-2007, 12:39 PM   #16
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went back and read it a couple of times and understand now
i looked at the car today and there is good oil and fuel pressure and there are now cracks on the manifold
so every thing is clearer now
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Old 05-23-2007, 01:43 PM   #17
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BS. You have cracked manifolds. I gaurantee it. You can't see them unless you either take them off the car or look VERY carefully with mirrors and good flashlights. Every square inch needs to be inspected.

I haven't seen a set of L67 S1 manifolds in the last 2 or 3 years that didn't have cracks.
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Old 05-23-2007, 02:00 PM   #18
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I took mine off a couple days ago. No cracks. But 4 of the 6 ports were leaking between the flange and the head.
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Old 05-23-2007, 02:21 PM   #19
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That'* another reason why you gotta pull the manifolds off. Do a search on holy exhaust cracks with me as the author. You'll see some neat pics. Some of the cracks are very small.
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Old 05-25-2007, 06:34 PM   #20
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cracked manifolds my ***
no leaks either I did wat u said I took a 2 hour look

I also listened with the motor running
I used a mechanical stethascope 2 check 4 leaking
nothing
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