LQ4 vs. LS1 flexplate question

[_Syclone_]

Hello all, Is the LQ4 flex plate and a LS1 flex plate the same? I had my precision stall converter re stalled and they made the motor side snout a little longer so it would bolt up the a LS motor. It fits fine but the snout is all the way in and the flex plate is about 1/4 to 5/16's away from the plate I have and the holes are not perfectly aligned.

If it is different then can I just bolt up a LS1 flex plate? will it be the same tooth for the stock starter on the LQ4 motor?

Thanks
Will

[RedHeartbeat]

Are you sure you have the converter seated all the way into the pump? If not, that is one sure fire way to break the front pump. I can't remember the measurement, but it has to be in correctly. I had to stand my 80e on end to get the converter to drop all the way on.

Yes, there is a difference in the early model LQ4 flywheels vs the LS1 flywheel. I believe its 1999-2001 has a longer snout on the end of the crankshaft, so the flywheel is flat. The later models have a dished flywheel like the LS1.

How far does the end of the crank stick out past the oil seal on your engine?

[_Syclone_]

Thanks RedHeartbeat

Found the answer:

Most of the LSx motors use a shorter crank shaft than the older GEN I and II SBC`s. The exception is the 1999-00 6.0L motors which use a crankshaft that is the same offset as the GEN I and II SBC`s.

Just thought I would share in case someone else runs into this issue.

Will