LS motor mounts. Need info
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
LS motor mounts. Need info
Guys, I was at AR headers yesterday and we were talking motor mounts. Now they are using Dirty Dingo slider mounts. I have a set of Dirty Dingo mounts but from all my info and measuring it puts the motor in the stock location. They are using the slider mounts but Phil their fabricator who also owns a C3 and fit the headers using his 78 puts the sliders in the stock location also. Here is a picture of where my mounts sit. The lower hole in the 3 bolt stock mounts goes into the front hole on the LS block. This seems to put the motor in the stock location. I tried mine moving the motor back and then forward and the stock location seemed to be the best fit for everything. It would give the stock AC guys room for the box and it keep the pulleys in a good location. I relayed this info onto AR but just want to confirm that most guys are putting it close to the stock position. They have to make a header fit everything, and not make custom ones for everybody. Let me know your thoughts on this. We will get these out there and I may have to just get my car up to them.
Melting Slicks
Joined: Feb 2009
Posts: 2,797
Likes: 608
From: Dallas Georgia
2020 Corvette of the Year Finalist (track prepared)
C3 of Year Winner (track prepared) 2019
DD slider mounts here as well, although my motor is not in the car yet....
The plan was to keep it as close to the stock location as possible.
The plan was to keep it as close to the stock location as possible.
Safety Car
Joined: May 2004
Posts: 4,364
Likes: 1,588
From: los altos hills california
VetteAid mounting plates AND z-bracket
http://vettaid.com/LSxPackagesKits.aspx
Energy Suspension motor mounts - I see they also make an adapter kit
http://www.energysuspensionparts.com...sp?prod=3.1148
Everything in stock location, except the motor sits a little high!
http://vettaid.com/LSxPackagesKits.aspx
Energy Suspension motor mounts - I see they also make an adapter kit
http://www.energysuspensionparts.com...sp?prod=3.1148
Everything in stock location, except the motor sits a little high!
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
When I was measuring things up, it looked like the plates that share that bottom bolt hole would result in the motor/trans face would be forward of the original location. The setback plates in the VetteAid post pic moved it about 1/4" from original location.
Burning Brakes
Joined: Oct 2008
Posts: 1,037
Likes: 14
From: Mobile Alabama
I know this wont help your cause, but throwing it out for anyone using this thread to pick their mounts.
I made stock location plates and didn't like them. I ended up changing them to lower and move the engine a hair rearward. This way worked better with the transmission I was using - using C5 manifolds anyway.
I made stock location plates and didn't like them. I ended up changing them to lower and move the engine a hair rearward. This way worked better with the transmission I was using - using C5 manifolds anyway.
Safety Car
Joined: May 2004
Posts: 4,364
Likes: 1,588
From: los altos hills california
My only gripe is the height, it would be nice if someone could integrate the mount with the adapter plate so that the motor didn't sit as high. But that is a different thread.
Intermediate
Joined: Oct 2013
Posts: 31
Likes: 2
Guys, I was at AR headers yesterday and we were talking motor mounts. Now they are using Dirty Dingo slider mounts. I have a set of Dirty Dingo mounts but from all my info and measuring it puts the motor in the stock location. They are using the slider mounts but Phil their fabricator who also owns a C3 and fit the headers using his 78 puts the sliders in the stock location also. Here is a picture of where my mounts sit. The lower hole in the 3 bolt stock mounts goes into the front hole on the LS block. This seems to put the motor in the stock location. I tried mine moving the motor back and then forward and the stock location seemed to be the best fit for everything. It would give the stock AC guys room for the box and it keep the pulleys in a good location. I relayed this info onto AR but just want to confirm that most guys are putting it close to the stock position. They have to make a header fit everything, and not make custom ones for everybody. Let me know your thoughts on this. We will get these out there and I may have to just get my car up to them.
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
I would be surprised if anything on my 45 year old car was within 1/4" specs.
The original Muncie transmission dropped into the original holes with no modification. Same with the linkage, nothing changed. Z-bar went where it was supposed to. If there's a 1/4" difference it seems to have been accommodated somehow.
My only gripe is the height, it would be nice if someone could integrate the mount with the adapter plate so that the motor didn't sit as high. But that is a different thread.
My only gripe is the height, it would be nice if someone could integrate the mount with the adapter plate so that the motor didn't sit as high. But that is a different thread.
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Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
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From: Forked River NJ
Hey Gordon its Pat, as we had talked about the motor placement I found the hooker headers part number 12623 HKR and it says it puts the motor 1 1/4 forward with the same bolt hole in the bottom mount to boss on the block. I looked at mine again(home made) and im using the same bolt hole as u and hooker. What type of dirty dingo plates are u using?
Intermediate
Joined: Oct 2013
Posts: 31
Likes: 2
Cant remember which ones they were but I have to do a little more research as to what ones I am using. These are about 2 years old now. AR is using sliders but in talking with Phil who owns the C3 and is the header fabricator he seemed to think it was very close to the setup I am running. I. Think most are running this way.
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I was going off the measurement of the back of the heads to the firewall. The LS heads are approx in the same location as the Gen1 heads. So it may move the LS motor ahead but the physical spot the motor sits is in approx the same location as the Gen1 motor.
Yes if the lower bolt is in the same hole regardless of brand of motor mount the motor will be in the same location.
Yes if the lower bolt is in the same hole regardless of brand of motor mount the motor will be in the same location.
Intermediate
Joined: Oct 2013
Posts: 31
Likes: 2
I was going off the measurement of the back of the heads to the firewall. The LS heads are approx in the same location as the Gen1 heads. So it may move the LS motor ahead but the physical spot the motor sits is in approx the same location as the Gen1 motor.
Yes if the lower bolt is in the same hole regardless of brand of motor mount the motor will be in the same location.
Yes if the lower bolt is in the same hole regardless of brand of motor mount the motor will be in the same location.
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
We are working on some solutions. They want my car there but with the weather that is coming and it is a hassle to get my car there I'm not sure if I will get it there any time soon without a great incentive. You are welcome to trial fit them once I get another set in my hands for sure.
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
I used the Z bar with my LS I initially had the 1" setback plates and it was close to stock. But the 621 bell combined with slightly raised engine, Richmond trans, and sagging body resulted in the bell contacting the tunnel. Add to that, the trans yoke was very close to bottoming out...I went for the shared lower bolt hole plates.
I just redrilled the Z bar mounts on both engine and frame to square it. Z bar clears the C5 exhaust, O2 sensor.
Btw, ended up using the 1" setbacks for my Olds swap with stock Z bar.
I just redrilled the Z bar mounts on both engine and frame to square it. Z bar clears the C5 exhaust, O2 sensor.
Btw, ended up using the 1" setbacks for my Olds swap with stock Z bar.
Burning Brakes
Joined: Oct 2008
Posts: 1,037
Likes: 14
From: Mobile Alabama