ls6 to lq9 motor mount question
Thread Starter
Joined: Mar 2010
Posts: 1,704
Likes: 10
From: Harrison City, PA
ls6 to lq9 motor mount question I'm currently putting an LQ9 408 stroker in my 04 CTS-V, and I've run into a big jam... I'm missing 2 bolt holes in the side of the block for the motor mounts. Is there an adapter plate anywhere I can use? I've been searching and it seems like I can't find anything. I've searched for "lq9 ls1 motor mount" "ls1 lq9 mount adapter" etc... no luck.
and with the LQ9, the holes on the leftmost side of the block, aren't there. ( left of 4.5 arrow, and right of 5.75 arrow)
what the fudge can i do?
and with the LQ9, the holes on the leftmost side of the block, aren't there. ( left of 4.5 arrow, and right of 5.75 arrow)
what the fudge can i do?
I have absolutely no idea what those motor mounts bolt to...
I have truck, f body, gto, and vette mounts. They all bolt to the 4 existing holes in the iron or aluminium block. Could there have been an adapter plate between the block and your mounts?
My suggestion would be measure the width of the frame mounts. Get solid SBC/BBC motor mounts (your frame mounts have rubber isolators) and a set of adjustable adapter motor plates.
If you figure out how those motor mounts bolt up, let us know. Btw is one 3 bolt and the other 4 bolt?.....rings a bell but can remember where I saw it.
Any chance the CTS-V mounts bolted to the front 2 of the regular 4 bolt mounts and to the other rear bosses that might not be on the truck blocks? I know the brass coolant plug is different between truck and aluminum blocks, but never paid attention to the other block bosses.
I have truck, f body, gto, and vette mounts. They all bolt to the 4 existing holes in the iron or aluminium block. Could there have been an adapter plate between the block and your mounts?
My suggestion would be measure the width of the frame mounts. Get solid SBC/BBC motor mounts (your frame mounts have rubber isolators) and a set of adjustable adapter motor plates.
If you figure out how those motor mounts bolt up, let us know. Btw is one 3 bolt and the other 4 bolt?.....rings a bell but can remember where I saw it.
Any chance the CTS-V mounts bolted to the front 2 of the regular 4 bolt mounts and to the other rear bosses that might not be on the truck blocks? I know the brass coolant plug is different between truck and aluminum blocks, but never paid attention to the other block bosses.
Last edited by garys 68; Aug 6, 2012 at 07:22 PM.
Thread Starter
Joined: Mar 2010
Posts: 1,704
Likes: 10
From: Harrison City, PA
I know that's exactly what's going on with these CTS-V mounts. I feel like I can fit a 1/4 or 3/8 piece of steel in between the block and the mounts on the drivers side, as in:
1 2 3
1 2 3
Holes indicated as "1" have a bolt going through the factory mount, a steel plate, and into the block
Holes indicated as "2" have a small headed, strong allen head bolt going in (enough clearance to fit the mount over them)
Holes indicated as "3" are drilled and tapped, NOT in the block, obviously, but bolted to the steel, and I could use that side of the engine mount.
I'm out of ideas for the passengers side.
1 2 3
1 2 3
Holes indicated as "1" have a bolt going through the factory mount, a steel plate, and into the block
Holes indicated as "2" have a small headed, strong allen head bolt going in (enough clearance to fit the mount over them)
Holes indicated as "3" are drilled and tapped, NOT in the block, obviously, but bolted to the steel, and I could use that side of the engine mount.
I'm out of ideas for the passengers side.
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My suggestion...measure your frame mounts, see if shert/wide or tall/narrow GM mounts fit. Buy solid BBC/SBC monuts.
Get the sliding adjustable Dirty Dingo or multihole plates:
http://www.ebay.com/itm/Adjustable-L...ddb555&vxp=mtr
Bolt it close to the original location.
Or if you're handy, make your own adapter plates with your existing mounts.
Get the sliding adjustable Dirty Dingo or multihole plates:
http://www.ebay.com/itm/Adjustable-L...ddb555&vxp=mtr
Bolt it close to the original location.
Or if you're handy, make your own adapter plates with your existing mounts.
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Verdad Gallardo Thread Starter
Joined: Mar 2010
Posts: 1,704
Likes: 10
From: Harrison City, PA
I was thinking about making adapter plates, but this is what worried me:
https://ls1tech.com/forums/attachmen...0806-00106.jpg
thanks for the info.
something like what you showed me would be awesome if I could bolt my motor mounts into the middle of the adjustment plate.
http://www.umiperformance.com/catalo...roducts_id=607
https://ls1tech.com/forums/attachmen...0806-00106.jpg
thanks for the info.
something like what you showed me would be awesome if I could bolt my motor mounts into the middle of the adjustment plate.
http://www.umiperformance.com/catalo...roducts_id=607
It looks like the CTS-V motor mounts bolt to the rear bosses on the aluminum block that are not there on an iron. They also look like they're in a different plane. Good news is that they look like they center the mount at the rear bolts of the standard 4 bolt mounts.
Your frame mounts already have rubber/poly isolators. A simple solution might be to try solid SBC/BBC chevy motor mounts bolted to a standard swap plate flipped backwards (link below). That would center the mounts over the rear bolts.
http://www.ebay.com/itm/LS1-Conversi...00ca46&vxp=mtr
Your frame mounts already have rubber/poly isolators. A simple solution might be to try solid SBC/BBC chevy motor mounts bolted to a standard swap plate flipped backwards (link below). That would center the mounts over the rear bolts.
http://www.ebay.com/itm/LS1-Conversi...00ca46&vxp=mtr
