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    Hunting down a weird idle

    Hey all. The current tune in my engine runs 25° advanced at idle. This seems excessive and I think it’s causing a very rough idle. Does this seem correct for an L 29?
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    1999 K2500 continuously gets 5mpg

    Hey all - I have a k2500 ccsb with a modded 7.4. Stock bottom end with Brodix short runner heads and all the valve train goodies. 510 cam both sides with a nice lsa for efi. The truck never gets better than 5mpgs (empty or towing). I have done it all: maf, o2s, new ECU, three new tunes, blocked...
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    Rear Catalytic Converter Direct Fit Options - 1999 7.4 CCSB

    Hey there - I ordered the Magnaflow y pipe with driver side cat (93607) but I cannot find the the next section with the passenger side cat to fit my truck. I have found part #95471 that looks to be identical to my stock exhaust, but anytime I verify fit on summit or jegs is comes back as...
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    L29 Build update - gremlins persist

    Hey all - some updates on my L29 build: I dove into HP Tuners and through the help form folks on the HP Tuner forums figured out that my timing table was no where near what it needed to be. I've been flashing updated timing on the ECM and things are improving with every new table. One thing...
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    Post L29 Build gremlin - need ideas

    Well I got my truck all put back together and it hauled an 11,000 pound trailer 1400 miles with 1,000 pounds in the back from Colorado to Michigan. It was 101 degrees through South Dakota and the ole girl did what I asked it to do. Trailer was probably a bit heavy but the brakes and controller...
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    Updated Power Steering Cooler Install - need photos

    Hey everyone - having a tough time finding info on this topic. I have the frame rail PS cooler assembly that GM no longer makes. It is leaking profusely so I purchased the long rectangular one that is supposedly a replacement for the frame rail style. I have read that other members have this...
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    Part 2637 Motor mount - manufactured wrong

    Just FYI - I am putting my L29 back into the truck and the motor mounts I got are manufactured slightly off. The third hole that mounts lower down on the frame is off by about 3mm and will not let the bolt through. I went to 3 different auto parts store today and compared like 5 brands to the...
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    L29 Oil Cooler line routing clarification

    Hi everyone - been sorting through this info on my rebuild and I am finding conflicting information. This is how I understand it: The oil cooler lines on a Gen VI come from the oil pan rail next to the oil filter. They are tapped fittings into the gallery with quick connects on them. The...
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    L29 Injector rail NLA - part # 17120039

    Does GM have a tendency to re stock stuff like this? I find it really odd that they discontinued a plastic fuel rail that lives above the lifter valley (heat) that has no aftermarket producers. Talk about a critical part concerning support of older vehicles.
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    COMP Cams 202/212 Tri-Power Extreme

    Just curious if anyone has run this in an L29. https://www.compcams.com/tri-power-xtreme-202-212-hydraulic-roller-cam-for-chevrolet-big-block-gen-vi.html
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    L29 rebuild - give me ideas

    I have a 1999 CC K2500 with a 454. The truck has 325K on it and it seems that the engine finally gave up the ghost. I have rebuilt a few engines and have done complete restorations on lots of oddball cars. I have never worked on an engine with so many rebuild options or avenues, and I would...
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    K2500 Axle Rebound Shutter

    Hey Yall - long time reader but this is my first post. So I just did an entire front end rebuild. Poly for almost all bushings, every wear item got replaced. Did a PSC XD steering gear and pump, SS Idler bracket, Cognito Arm braces...the works. The front end feels great. As I turn my...

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