LS1 motor mount brackets????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jkade · 09-12-2007, 09:34 PM

I made my own conversion brackets that are like the s&p style. Question is, the factory three bolt mounts that I took off a 86 350 had a plate between the block and the mount and the mount has a hump that is on the back side of it ( the hump sits inside the plate that is between them). So if I don't use the plate the mount will not sit flush on the brackets I made, if I use the plates will the mounts still bolt into the towers or will they be spaced to wide to get the 2 bolts in? I hope this makes sense

BustedTruck · 09-12-2007, 09:47 PM

I purchase mine from Classic Performance Products. They have a slot cut into them that the raised rib on the mount sits in. I dont know what needs to be done to the S & P mounts.

jkade · 09-12-2007, 09:49 PM

Is there a mount the doesn't have the raised rib?

jkade · 09-13-2007, 01:24 PM

bump.ttt

shifty · 09-13-2007, 03:23 PM

*bump* for you.

jkade · 09-13-2007, 04:06 PM

I guess it is going to be trial and error. I will try it with the plates and if it wont work I will cut my plates so it will sit in there flush.

shifty · 09-13-2007, 06:28 PM

I'm really curious to see what you end up with. There are three different mounts for our trucks - BBC, SBC and inline 6. I think they are all distinct. There is a thread here which explains how to convert one of those into GenIII mounts (i think the SBC mounts are the ones). The article is in the FAQ i think - and I believe the poster's name was 'rolphe1' or something similar that started with an R.

The GenIII ECE mounts I used look like 78-87 engine mounts (or 73-77?) that just have the top half of a F-Body mount bolted onto them. You could probably make the same mount for around $100.

I really wish someone here had a definitive answer...but ...

jkade · 09-13-2007, 08:52 PM

I am using the mounts and towers off a 85 or 86 2wd truck. I will let you know if they work.

BustedTruck · 09-13-2007, 09:35 PM

The mount plates I purchased came with the rubber mounts with the rib, but I wanted the poly mounts & they have no rib. Not sure if this will answer your first question, but hope it helps.

jkade · 09-13-2007, 09:37 PM

Quote:

Originally Posted by BustedTruck

The mount plates I purchased came with the rubber mounts with the rib, but I wanted the poly mounts & they have no rib. Not sure if this will answer your first question, but hope it helps.

Those are totally different than what I am using. Thanks for trying though

billyjo · 09-13-2007, 10:06 PM

I'm using the S&P mounts and mine don't have the slot in them. They bolt flat with a bolt going through the tower into the mount very similiar to the picture above on the left (gold anadized).

I know there is a difference between the 4x4 mounts and the 2x4 mounts so the way mine mount may not be applicable.

Good thing I went out and looked because mine was loose.

Bill

jkade · 09-16-2007, 07:41 PM

I ended up using the stock 67 mounts. The towers off the 85 would not work so I used what I had. I got the motor and trans in and about 75% wired up. Maybe it will run by this time next week.

Americanrider · 09-17-2007, 12:33 AM

http://www.classicperform.com/tech_a...ngine-Swap.htm

shifty · 09-17-2007, 11:47 AM

Man, classic performance needs to update that page, it's pretty dated and single-sighted at this point.

09-12-2007, 09:34 PM	#1
jkade Senior Member Join Date: Nov 2005 Location: AL Posts: 2,519	LS1 motor mount brackets????? I made my own conversion brackets that are like the s&p style. Question is, the factory three bolt mounts that I took off a 86 350 had a plate between the block and the mount and the mount has a hump that is on the back side of it ( the hump sits inside the plate that is between them). So if I don't use the plate the mount will not sit flush on the brackets I made, if I use the plates will the mounts still bolt into the towers or will they be spaced to wide to get the 2 bolts in? I hope this makes sense

09-12-2007, 09:47 PM	#2
BustedTruck Registered User Join Date: Dec 2006 Location: Braselton, GA Posts: 245	Re: LS1 motor mount brackets????? I purchase mine from Classic Performance Products. They have a slot cut into them that the raised rib on the mount sits in. I dont know what needs to be done to the S & P mounts.

09-12-2007, 09:49 PM	#3
jkade Senior Member Join Date: Nov 2005 Location: AL Posts: 2,519	Re: LS1 motor mount brackets????? Is there a mount the doesn't have the raised rib?

09-13-2007, 01:24 PM	#4
jkade Senior Member Join Date: Nov 2005 Location: AL Posts: 2,519	Re: LS1 motor mount brackets????? bump.ttt

09-13-2007, 03:23 PM	#5
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: LS1 motor mount brackets????? bump for you. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

09-13-2007, 04:06 PM	#6
jkade Senior Member Join Date: Nov 2005 Location: AL Posts: 2,519	Re: LS1 motor mount brackets????? I guess it is going to be trial and error. I will try it with the plates and if it wont work I will cut my plates so it will sit in there flush.

09-13-2007, 06:28 PM	#7
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: LS1 motor mount brackets????? I'm really curious to see what you end up with. There are three different mounts for our trucks - BBC, SBC and inline 6. I think they are all distinct. There is a thread here which explains how to convert one of those into GenIII mounts (i think the SBC mounts are the ones). The article is in the FAQ i think - and I believe the poster's name was 'rolphe1' or something similar that started with an R. The GenIII ECE mounts I used look like 78-87 engine mounts (or 73-77?) that just have the top half of a F-Body mount bolted onto them. You could probably make the same mount for around $100. I really wish someone here had a definitive answer...but ... __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

09-13-2007, 08:52 PM	#8
jkade Senior Member Join Date: Nov 2005 Location: AL Posts: 2,519	Re: LS1 motor mount brackets????? I am using the mounts and towers off a 85 or 86 2wd truck. I will let you know if they work.

09-13-2007, 09:35 PM	#9
BustedTruck Registered User Join Date: Dec 2006 Location: Braselton, GA Posts: 245	Re: LS1 motor mount brackets????? The mount plates I purchased came with the rubber mounts with the rib, but I wanted the poly mounts & they have no rib. Not sure if this will answer your first question, but hope it helps. Attached Images

09-13-2007, 10:06 PM	#11
billyjo Junior Member Join Date: Oct 2005 Location: Vancouver, WA Posts: 95	Re: LS1 motor mount brackets????? I'm using the S&P mounts and mine don't have the slot in them. They bolt flat with a bolt going through the tower into the mount very similiar to the picture above on the left (gold anadized). I know there is a difference between the 4x4 mounts and the 2x4 mounts so the way mine mount may not be applicable. Good thing I went out and looked because mine was loose. Bill __________________ 1972 K/5 4x4, Radixed LS1 6.0, 428HP/445TQ, Lingenfelter GT2-3 cam, WCCH 90mm J-Tube, LS2 90mm TB, Stainless Works Headers, NV4500, 4.56 gears, Detroit Lockers, 14 bolt FF, Dana 60, 4 wheel disk Hydro Brakes, dual electric fans, Autometer guages, 4" lift, Zero Rates, Weld Evo Velocity XT8 wheels, 35x12.5x17 Super Swamper SSR's..... http://s72.photobucket.com/albums/i1...tos/?start=all

09-16-2007, 07:41 PM	#12
jkade Senior Member Join Date: Nov 2005 Location: AL Posts: 2,519	Re: LS1 motor mount brackets????? I ended up using the stock 67 mounts. The towers off the 85 would not work so I used what I had. I got the motor and trans in and about 75% wired up. Maybe it will run by this time next week.

09-17-2007, 12:33 AM	#13
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Re: LS1 motor mount brackets????? http://www.classicperform.com/tech_a...ngine-Swap.htm

09-17-2007, 11:47 AM	#14
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: LS1 motor mount brackets????? Man, classic performance needs to update that page, it's pretty dated and single-sighted at this point. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.



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