Confused about Motor Mount options - The 1947 - Present Chevrolet & GMC Truck Message Board Network

5150 · 10-08-2011, 11:20 PM

I'm confused about the motor mount options for the LS1's. Which is probably a sign I shouldn't delve into this, but I've never obeyed those signs in the past so why start now.

I guess I'm confused about the $25 adapter plates compared to the $219 ECE kit. What's the difference and which one is more "cost effective"

The LS1 I'm picking up has the original A/C compressor still with it. I'm putting this in my burb and will have to go Vintage Air at some point. I know that's another question in it's self. I'm not trying to make this look good, just want it bolted soundly to the frame.

pat565 · 10-09-2011, 09:47 AM

The adapter plate allows you to bolt up a standard sbc mount to the ls block. -This works for some to use the existing mounts to mount into the chassis. I have just done this in my 71.
The other kits gives you everything to get the engine mounted to the frame using nothing from your original setup.

5150 · 10-09-2011, 11:00 AM

The only thing I have left is the original stands in my 72.

BR3W CITY · 10-09-2011, 12:29 PM

its hard to beat the cost of the adapter plates. There are a few different ones out there, with different offsets that can move the engine forward or back for clearance.

Even with newer mounts and hardware, the adapter plate setup cost me no more than $55. I didn't see a reason to spend another 150$ that could go elsewhere.

pat565 · 10-09-2011, 02:54 PM

I did modify mine to set the engine back. I had to cut the front hole that would hold the upper from sbc mount bolt, to gain cleance for the AC with the factory brackets ( on the 5.3). I then ended up fipping the mounts side to side and dilling and tapping one hole for the new location of the sbc mount.

In the end, the frame mounts are in the two rear holes on upper frame flange, and the trans crossmember is in the most forward set of holes. This should push the engine back to make it sit a bit tighter to the firewall.

mcbassin · 10-09-2011, 09:05 PM

I used the cheaper style plates on my install with what I think are the 73 up style engine stands. I had to drill new holes for inboard mounting holes. I also moved the passenger side back to accommodate the a/c compressor. Which means I had to cut the angled portion that side adapter plate and then made a brace to use the last hole and carry the weight on the back. The reason I went with this style stand, I think they are a better design and I never liked the 72 back design (I had one break on me and the whole engine would raise up.
Here are the pictures I have, I will try to get more when I get back to my build.

5150 · 10-11-2011, 11:12 AM

This is what I have now

mcbassin · 10-11-2011, 11:22 AM

Quote:

Originally Posted by 5150

This is what I have now

I had those same mounts too but I really don't care for the motor mounts on this style. (just my opinion though). My reasoning, I have a 402 in my 70. It used to eat those mounts for lunch. when they fail the whole engine raises up. Not cool

The newer style can fail and the engine can't raise up more than the inner mount. Like I said, just my .02 cent.
You can pick up the later stands at pull-a- part cheap. Good luck.

BR3W CITY · 10-12-2011, 11:25 PM

^^ torque straps

mcbassin · 10-13-2011, 12:07 AM

Quote:

Originally Posted by BR3W CITY

^^ torque straps

Yep, back in the day we used chains too

BR3W CITY · 10-13-2011, 01:00 PM

that sounds noisy.
I really want to get a set of torque/limiting straps for me engine once I've got the procharger setup done, but I will admit they don't look nearly as cool; as they would on something with a big bds sitting up top.

pat565 · 10-15-2011, 08:40 PM

^^^^

Put an F3 and gear drive on then!

BR3W CITY · 10-16-2011, 02:57 AM

I can put an intercooled D1sc on it (or use meth) and change pretty much nothing but cam and tune. If I went that big it would be engine build time. Maybe someday.

jays68yak · 10-16-2011, 03:48 AM

In my experience...the towers you currently have on your frame are going to cause exhaust manifold/header clearance issues. If you run stock 72 towers and adapter plates, or 73 up towers and adapter plates, or the ece kit you would be good. I've done a 72 using the stock towers and adapter plates, along with the lsx swap headers. That was the best one imo. Also done a 71 and had to cut the tower up for clearance.
Posted via Mobile Device

pat565 · 10-16-2011, 10:00 AM

The stock frame stands can fit nicely with the factory A/C on the LS using Doug Thorley headers. They were made for these trucks, so they look and fit awsome

10-08-2011, 11:20 PM	#1
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Confused about Motor Mount options I'm confused about the motor mount options for the LS1's. Which is probably a sign I shouldn't delve into this, but I've never obeyed those signs in the past so why start now. I guess I'm confused about the $25 adapter plates compared to the $219 ECE kit. What's the difference and which one is more "cost effective" The LS1 I'm picking up has the original A/C compressor still with it. I'm putting this in my burb and will have to go Vintage Air at some point. I know that's another question in it's self. I'm not trying to make this look good, just want it bolted soundly to the frame. __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

10-09-2011, 09:47 AM	#2
pat565 Registered User Join Date: Jun 2011 Location: Wembley, Ab Posts: 53	Re: Confused about Motor Mount options The adapter plate allows you to bolt up a standard sbc mount to the ls block. -This works for some to use the existing mounts to mount into the chassis. I have just done this in my 71. The other kits gives you everything to get the engine mounted to the frame using nothing from your original setup.

10-09-2011, 11:00 AM	#3
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: Confused about Motor Mount options The only thing I have left is the original stands in my 72. __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

10-09-2011, 12:29 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Confused about Motor Mount options its hard to beat the cost of the adapter plates. There are a few different ones out there, with different offsets that can move the engine forward or back for clearance. Even with newer mounts and hardware, the adapter plate setup cost me no more than $55. I didn't see a reason to spend another 150$ that could go elsewhere. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

10-09-2011, 02:54 PM	#5
pat565 Registered User Join Date: Jun 2011 Location: Wembley, Ab Posts: 53	Re: Confused about Motor Mount options I did modify mine to set the engine back. I had to cut the front hole that would hold the upper from sbc mount bolt, to gain cleance for the AC with the factory brackets ( on the 5.3). I then ended up fipping the mounts side to side and dilling and tapping one hole for the new location of the sbc mount. In the end, the frame mounts are in the two rear holes on upper frame flange, and the trans crossmember is in the most forward set of holes. This should push the engine back to make it sit a bit tighter to the firewall.

10-09-2011, 09:05 PM	#6
mcbassin Still Learning Join Date: Jul 2009 Location: Central Oklahoma Posts: 10,108	Re: Confused about Motor Mount options I used the cheaper style plates on my install with what I think are the 73 up style engine stands. I had to drill new holes for inboard mounting holes. I also moved the passenger side back to accommodate the a/c compressor. Which means I had to cut the angled portion that side adapter plate and then made a brace to use the last hole and carry the weight on the back. The reason I went with this style stand, I think they are a better design and I never liked the 72 back design (I had one break on me and the whole engine would raise up. Here are the pictures I have, I will try to get more when I get back to my build. __________________ Mike "69 Short Wide" My Project 86 Silverado Landen's Project Instagram: @mcbassin My Website C/10 Club Oklahoma Facebook Group Last edited by mcbassin; 10-11-2011 at 11:24 AM.

10-11-2011, 11:12 AM	#7
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: Confused about Motor Mount options This is what I have now __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

10-12-2011, 11:25 PM	#9
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Confused about Motor Mount options ^^ torque straps __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

10-13-2011, 01:00 PM	#11
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Confused about Motor Mount options that sounds noisy. I really want to get a set of torque/limiting straps for me engine once I've got the procharger setup done, but I will admit they don't look nearly as cool; as they would on something with a big bds sitting up top. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

10-15-2011, 08:40 PM	#12
pat565 Registered User Join Date: Jun 2011 Location: Wembley, Ab Posts: 53	Re: Confused about Motor Mount options ^^^^ Put an F3 and gear drive on then!

10-16-2011, 02:57 AM	#13
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Confused about Motor Mount options I can put an intercooled D1sc on it (or use meth) and change pretty much nothing but cam and tune. If I went that big it would be engine build time. Maybe someday. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

10-16-2011, 03:48 AM	#14
jays68yak Registered User Join Date: Oct 2002 Location: Gilroy, CA Posts: 1,453	Re: Confused about Motor Mount options In my experience...the towers you currently have on your frame are going to cause exhaust manifold/header clearance issues. If you run stock 72 towers and adapter plates, or 73 up towers and adapter plates, or the ece kit you would be good. I've done a 72 using the stock towers and adapter plates, along with the lsx swap headers. That was the best one imo. Also done a 71 and had to cut the tower up for clearance. Posted via Mobile Device __________________ 1969 Chevy Project SWB Fleet, 20s, 5.3, t56, in the weeds. 1970 Chevy Truck cab on a 1979 Jimmy frame-8.1 liter 496 bbc/sm465/np203-jeds doubler-np205/d60/14bff Welded/42 tsls on recentered H1s 1998 Chevy Crew Cab K3500 SAS'd with hpd60, links and swayaway coilovers. 8.1l vortec DD/towrig "I like long walks, especially when they are taken by people who annoy me. "

10-16-2011, 10:00 AM	#15
pat565 Registered User Join Date: Jun 2011 Location: Wembley, Ab Posts: 53	Re: Confused about Motor Mount options The stock frame stands can fit nicely with the factory A/C on the LS using Doug Thorley headers. They were made for these trucks, so they look and fit awsome

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