Actually planning an LN3 to L67 top swap - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-19-2007, 08:26 AM   #11
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Radomir, I can tell you the diameter of the shaft hole won't matter in that case. The offset is totally wrong and won't line up with your belt path. That pulley will 'stick out' too far.

You would have to have the back face machined. If you're willing to do that, I suggest you contact the seller and ask him the inside diameter (note that the pulley in the ebay link is from a Vortech, not an Eaton).
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Old 11-19-2007, 01:44 PM   #12
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If it'* a matter of spending this much money, I'm leaning closer to your solution. Are there places that could get a 2.9 or 3.0 pulley for the M62? I'll see if I can find the BMW guy.
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Old 11-19-2007, 02:29 PM   #13
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It'* not just about diameter. You have to have the correct OFFSET as well.

For instance, greyhare here at work has an Eaton M45 with the same nosedrive shaft diameter as my M62'*. But our pulleys are not interchangeable due to the different offsets.
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Old 11-19-2007, 02:31 PM   #14
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That is a party pooper. I guess I could still do the Gen 3 pulley on a Gen 2 SC, but it would be great to have less boost. Who manufactures pulleys? Would it be too much to get one at about 3"? I'm sure there'* currently no market for these except for me.
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Old 11-19-2007, 02:36 PM   #15
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I AM SO PUMPED! LOOK!!!!
http://www.pulleyboys.com/gms1p.html

I think this is far too satisfying. Now, I think I'm all set on the pulley unless someone can find something bigger. What are some of your recommended 3" or larger catalytic converter and muffler (one side, straight through) part numbers?
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Old 11-20-2007, 01:41 PM   #16
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i dont think you really need anything bigger. F14Crazy drove his top swap reatta for over 20k miles with a gen3 and stock pulley. His car had 150+k miles with no rebuild.
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Old 11-21-2007, 01:23 AM   #17
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It'* just a good safety thing. Plus, I can swap Series 1 supercharger pulleys so quickly & correctly, I may as well. In your face, Series 2!!!

I've already found some machinists and a machine shop or two. I could put that notch in the L67 harmonic balancer now. Now that I have found the 3" pulley and can open up the exhaust piping, I think I should be almost all set. These are good plans. I have yet to contact Ryan for the computer work, though. Do I have pretty much everything covered?
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Old 11-21-2007, 02:44 AM   #18
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i think so. Make sure you address the fuel pump though. F14Crazy'* topswap was on a reatta and this is on a bonneville so there may be different challenges.
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Old 11-21-2007, 05:05 AM   #19
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I have great news! I found a guy who has a normal-looking house and garage, externally, but has one of the most advanced garages you could ever see. He does his own supercharger needle bearings and can easily swap M90 pulleys. There'* a purple Grand Prix at his shop at the moment with the engine taken apart and polished to a mirror finish and a chrome transmission housing. It'* a work in progress. The guy'* personal car is a Grand Prix with just a smaller pulley and bigger exhaust pipe. He messed with a scanner and tuned it for 6 months. Now, the car runs a 12.993-second quarter mile. That'* awesome! The best part about this is that he works exclusively with GM 3800 engines! I found out about him through 1337ssei, who is working with him on getting his new supercharger assembled. I should be all set once I gather a spare supercharged engine or two and some free time.

Also, I almost forgot to mention something. The 92-93 Bonnevilles seem to have an accessory bracket made for the smaller alternator of the two available for the 92-95 years. I would like to put on the bigger 140-amp alternator. As I'm aware, they're not interchangeable. Will I have to get a 94-95 accessory bracket? Here'* what I have figured out from this that I know I'll need:
- Gen2 supercharger & throttle body
- probably a new supercharger coupler, Intense-style
- 3" pulley
- L67 harmonic balancer machined to fit the LN3
- L67 fuel injectors
- 3" or bigger exhaust all the way back
- power steering pump lines
- accessory bracket to fit a 140-amp alternator
- fuel pump
- reprogrammed/new PCM

Perhaps that guy close to here is going to be able to rewrite the PCM. If not, Ryan is in Ft Wayne, which is 2 hours from Indianapolis. I think Intense is 3-4 hours away, and ZZP is about the same 3-4 hour drive. I believe the term for this is holyfreakingyesandsuch.
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Old 11-21-2007, 08:53 AM   #20
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Find a pic under my hood. My red alternator is a 94/95 140 amp unit 'amped up' to 160 amps. That'* on my stock 93 bracket.

3" exhaust? No. That'* going to kill your low-end. Would you believe I still run 2.5" exhaust? The only exception is my exhaust cutout, but I notice little difference at the track with it open. Every Series 1 that went to 3" exhaust on this Forum (about 3?) regretted it.

Your friend is not likely to be able to work over your PCM. Totally different animal. GMTuners is the most experienced in the OBD1 PCM'* dealing with odd L67 applications.
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