Fbody LSX swap problems
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Fbody LSX swap problems Looking for some help on an LSx swap project that has turned into a nightmare. I have a 2002 automatic Fbody Camaro Z28 and I decided to swap in a boost ready LSX engine for future upgrades I have planned. I got the new motor installed at a local shop then towed it to the tuner who put in some LS3 injectors and put it on the dyno. He called me back saying the car was blowing white smoke on decel after a WOT throttle pull. He didn't want to test it anymore and told me it needed to be checked out. At this point i opened a case with GM as the motor is brand new and they approved me to take it to a performance shop that they would work with. Long story short the engine ended up having a blown piston. Surprisingly i was sent a replacement motor and after being installed and dynoed with another new set of injectors, I am having the same issue with the white smoke on decel and low HP. They did a compression test after the dyno and all cylinders tested good. They definitely have the PCV system setup the way GM recommends so I don't believe that's the issue. Does anybody have any suggestions for me? I am at my wits end with this project. My setup is as follows:
New items for this project:
LSX-376-B15
yank SS 4000 stall converter with cooler
BMR turbo tubular K-member
Fast 102MM intake manifold with 102MM throttle body
Reused items from original motor:
Front accessories(power steering, AC, alternator, water pump)
Oil Pan
BBK Long tube headers and SLP catback
The shop thinks the problem could be the oil pan as they say it had to be modified to match up to the new motor, not sure why as I was told by the engine build site it would work. They are currently waiting on GM to advise the next move. Any advice to speed things up would be much appreciated.
New items for this project:
LSX-376-B15
yank SS 4000 stall converter with cooler
BMR turbo tubular K-member
Fast 102MM intake manifold with 102MM throttle body
Reused items from original motor:
Front accessories(power steering, AC, alternator, water pump)
Oil Pan
BBK Long tube headers and SLP catback
The shop thinks the problem could be the oil pan as they say it had to be modified to match up to the new motor, not sure why as I was told by the engine build site it would work. They are currently waiting on GM to advise the next move. Any advice to speed things up would be much appreciated.
Thread Starter
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Launching!
Joined: Jan 2004
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Can you give more details on your boost set up. Post some pics showing PCV., any oil feed and return lines. My first thought is youre pulling vacuum and oil during decel, find out where.
LSX-376-B15, just looked that up, hadnt seen these before, looks real nice from the specs.
LSX-376-B15, just looked that up, hadnt seen these before, looks real nice from the specs.
Last edited by indyjps; Sep 15, 2020 at 10:01 AM.
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You’re going to find the trans tunnel on a Foxbody and SN95 is kinda small and doesn’t really fit a a lot of transmissions without a little massaging. Keep your motor low to help avoid this. You can get by with Fbody 4th gen radiator and fans, they fit the Mustang well. 8.8 rear with a little upgrading will work well and is well supported in the aftermarket, weld the tubes into the center section and if you’re up to it get some aftermarket 31 splined axles using 9 inch housing ends, get rid of those weak tapered 28 splined c clip axles.
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