427ci LS2 sleeved, dry sump oil pump, engine build & install, 69 Camaro

[parsonsj]

Hey Dale,

Back to your clutch set up: I've got a question/caution for you. D&D tells me that their spacer is designed for the LS1 (Camaro) slave, not the ZR1 slave, and that Mark S. used LS1 slaves in his similar setups.

It might be a good idea to compare the sizes of the LS1 and ZR1 slaves to make sure you don't have a problem down the road.

[garickman]

Originally Posted by parsonsj

Hey Dale,

Back to your clutch set up: I've got a question/caution for you. D&D tells me that their spacer is designed for the LS1 (Camaro) slave, not the ZR1 slave, and that Mark S. used LS1 slaves in his similar setups.

It might be a good idea to compare the sizes of the LS1 and ZR1 slaves to make sure you don't have a problem down the road.

If it works fine now, how could it be a problem down the road? I am just asking because I am new to all of this. I am only in the mock up stages but I have already purchased the complete set up Dale has. Wondering if this is something I should change now.

[parsonsj]

Originally Posted by Greg

If it works fine now, how could it be a problem down the road?

Good question. A couple of things come to mind:
1. Too much or or not enough release bearing to clutch finger clearance could lead to premature bearing failure, or
2. Too much or not enough wear adjustment could lead to shortened clutch life.

Or it might be just fine as is. Does anybody know of the dimensional differences (if any) between the LS1 and the LS9 slaves? I think that's what we need to know.

[DaleTx]

Originally Posted by parsonsj

Good question. A couple of things come to mind:
1. Too much or or not enough release bearing to clutch finger clearance could lead to premature bearing failure, or
2. Too much or not enough wear adjustment could lead to shortened clutch life.

Or it might be just fine as is. Does anybody know of the dimensional differences (if any) between the LS1 and the LS9 slaves? I think that's what we need to know.

John, I found out some info on the dimensions for the for the LS1 and LS9 slaves. I contacted Katech and they said the ZR1 LS9 slave is 2-3/8” when compressed. I went to an auto parts store and measured an LS1 slave for a 2002 camaro (AC Delco #386433, Summit #24264182) and it was about 2-1/2” when compressed.

It looks like either the LS1 or LS9 slave would work. The plumbing is slightly different on the two slaves, and the ZR1 slave has a rubber boot covering the spring and the LS1 slave did not… I’m not sure what other differences there might be.

[parsonsj]

Dale,

I was working on the exact same information. I agree that either should work fine, and I am resting easier myself since my project's drivetrain is all bolted up and installed in the car.

Thanks!

[garickman]

Originally Posted by DaleTx

John, I found out some info on the dimensions for the for the LS1 and LS9 slaves. I contacted Katech and they said the ZR1 LS9 slave is 2-3/8” when compressed. I went to an auto parts store and measured an LS1 slave for a 2002 camaro (AC Delco #386433, Summit #24264182) and it was about 2-1/2” when compressed.

It looks like either the LS1 or LS9 slave would work. The plumbing is slightly different on the two slaves, and the ZR1 slave has a rubber boot covering the spring and the LS1 slave did not… I’m not sure what other differences there might be.

Good news! Thanks for the update Dale. Pretty cool that you took the time to find out this info even though your ride is done. Much appreciated.

[DaleTx]

Originally Posted by parsonsj

Dale,

I was working on the exact same information. I agree that either should work fine, and I am resting easier myself since my project's drivetrain is all bolted up and installed in the car.

Thanks!

Originally Posted by garickman

Good news! Thanks for the update Dale. Pretty cool that you took the time to find out this info even though your ride is done. Much appreciated.

No problem guys...

Be sure to report back how you like the clutches... I'm sold on the set up. It's hard to beat the OEM stuff. Super smooth engagement and firm grip.

[parsonsj]

Originally Posted by Dale

Be sure to report back how you like the clutches...

I'm running the same ZR1 clutch in my Z06. I've got about 300 miles on it, and it's great. Smooth, easy on the leg, etc. No hint of chatter or anything like that. I'm a big fan of OEM clutches too.

[DaleTx]

Originally Posted by parsonsj

Hey Dale,

Back to your clutch set up: I've got a question/caution for you. D&D tells me that their spacer is designed for the LS1 (Camaro) slave, not the ZR1 slave, and that Mark S. used LS1 slaves in his similar setups.

It might be a good idea to compare the sizes of the LS1 and ZR1 slaves to make sure you don't have a problem down the road.

I don’t know the dimensional difference is between the LS1 slave and the ZR1 slave, and I’m not sure which bell housing Mark Stielow used on his build. I am using a QT bell part#RM-8020… D&D “ZR1 Clutch Spacer” Part#BC40… GM ZR1 throw out bearing part#24237569… GM pilot bearing part#12557583… GM ZR1 twin disc clutch, and a Katech (Fidanza) aluminum flywheel.

I was very careful to check all the critical dimensions when installing the new transmission and clutch, including the free play on the slave… and the fit of the transmission input shaft to the pilot bearing. Using the parts listed above, everything fit correctly and the clearance between the clutch fingers and slave face was ~0.12”. I did not have to use any shims on the ZR1 slave.

When I called D&D and told them I was installing a ZR1 twin disc clutch and ZR1 slave they asked which bell I was using. They knew exactly which spacer I needed to use with the QT bell. They had the spacer I needed on the shelf. I’ve been driving the car for a couple of months now and everything works great.

I do appreciate the word of caution though… it’s good to have discussions like this. When you mix and match parts things can go wrong.