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Old 12-15-2018, 06:40 PM   #1
Bartman008
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New LS for my 72 blazer

Does anyone know what I will need to change on the motor mounts when I install the new LS motor? Or will the stock ones work?
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Old 12-15-2018, 08:32 PM   #2
Blazerowner
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Re: New LS for my 72 blazer

You need a different crossmember for the engine to fit. The stock one is too narrow. There are a couple of companies making them. I used a Tilden on mine. Depending on the transmission it will pretty much be a bolt in job. I used a 4l80e and had to elongate the th400 frame holes to slide the crossmember forward slightly. If you use a 4l60 you likely won’t have to do that and it will bolt right in. Also be sure the pan will fit. I used a Holley swap pan and it fits fine. The Tilden comes with motor mounts included along with bolts. The other thing I like about it is you don’t have to move your brake lines.
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Last edited by Blazerowner; 12-16-2018 at 12:17 AM.
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Old 12-15-2018, 10:21 PM   #3
jjzepplin
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Re: New LS for my 72 blazer

Subbed.
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Old 12-16-2018, 11:00 AM   #4
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Re: New LS for my 72 blazer

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Originally Posted by Blazerowner View Post
You need a different crossmember for the engine to fit. The stock one is too narrow. There are a couple of companies making them. I used a Tilden on mine. Depending on the transmission it will pretty much be a bolt in job. I used a 4l80e and had to elongate the th400 frame holes to slide the crossmember forward slightly. If you use a 4l60 you likely wonít have to do that and it will bolt right in. Also be sure the pan will fit. I used a Holley swap pan and it fits fine. The Tilden comes with motor mounts included along with bolts. The other thing I like about it is you donít have to move your brake lines.
Thanks for the info on the crossmember. I am using a 4l60e. If I can figure out how to get pictures on the site I will show my progress. I have rust free 72 all stock. It should be a good build.
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Old 12-16-2018, 11:32 AM   #5
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Re: New LS for my 72 blazer

Welcome Batman!!! Oh I get it now. 4X4. Duh
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Old 12-16-2018, 08:43 PM   #6
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Re: New LS for my 72 blazer

Yeah move the engine forward with the crossmember and you will be golden. You won’t have to change much with that method. If you buy the adapter you can bolt the 205 tcase to the 4l60 and back into the stock location and it will look stock from the cab. No one will even know you have an overdrive. I considered the 60 or 70e but I have a stout ls3 and wanted the Tranny to last a long time. The 80e pushed the engine pretty far forward though. I have to run electric fans and I have a Wagner serpentine drive. I believe the 60e is about 4 or 5 inches shorter.
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Old 12-16-2018, 09:10 PM   #7
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Re: New LS for my 72 blazer

Your Blazer looks nice, I found two different crossmembers one is made here in AZ it appears. I will find out tomorrow.
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Old 12-17-2018, 12:19 AM   #8
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Re: New LS for my 72 blazer

Here’s a couple more recent pics. I added a 3” lift. I also noticed I used the original holes for the th350 location. Its been a bit since I put it in. There’s a lot of adjustability with the Tilden crossmember. The others out there don’t use the original frame holes. You have to drill new ones. I wasn’t a fan of that and if you ever change transmissions you have to redrill.

Below is the crossmember I used and it’s on sale:

http://tildenmotorsports.com/63-72-g...ssmembers.html
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Old 12-17-2018, 09:02 PM   #9
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Re: New LS for my 72 blazer

That really looks nice. I found a place here in the Phoenix area Dirty Dingo Motorsport that makes a crossmember. I spoke with there sales dept today and yes there is some drilling required with there product. That seems to be the only downside. Good thing is they are local and they work with my engine builder on other projects. I will keep you informed on how I like the product. I am picking up the crossmember tomorrow.
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Old 12-17-2018, 10:16 PM   #10
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Re: New LS for my 72 blazer

Thanks for the compliment. It’s definitely a labor of love. I can’t wait to drive it again.

I have the DD crossmember. I bought it a few years before the swap. I’m pretty sure you have to reroute your brake lines and it doesn’t have any adjustment. It has the plus of a removable center section but I prefer the Tilden's adjustability.
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Old 12-18-2018, 09:24 AM   #11
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Quote:
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Thanks for the compliment. Itís definitely a labor of love. I canít wait to drive it again.

I have the DD crossmember. I bought it a few years before the swap. Iím pretty sure you have to reroute your brake lines and it doesnít have any adjustment. It has the plus of a removable center section but I prefer the Tilden's adjustability.
I think that your advice is good you have done the work, the Tilden is the winner. It is also $100 cheaper.
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Old 12-19-2018, 01:33 AM   #12
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Re: New LS for my 72 blazer

Either one should work but I was worried about drilling so it was a preference on my part. I threw away some money buying both but I figure I can sell it when I get time to box it up. Post up some pics with what you go with. There aren’t a lot of threads for the 4x4 swap so it’s always nice to have a reference. I like your blazer that’s a good color.
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Old 12-19-2018, 11:50 AM   #13
paul mora
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Re: New LS for my 72 blazer

I am thinking about putting a ls in my Blazer next year. Since you are in the process of doing this have you considered putting together a parts list and posting it in your thread. I thought a lift kit was required to convert to a LS and I do not want to put a lift on my Blazer.
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Old 12-19-2018, 10:18 PM   #14
Bartman008
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Re: New LS for my 72 blazer

I am in my infant stage of this swap, from what I I have read an been told a lift is not required but it is recommended due to having to change the crossmember and it is lower than the original. There may be clearance issues.
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Old 12-20-2018, 12:38 AM   #15
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Re: New LS for my 72 blazer

Mine required the lift. It was really close to the pumpkin.
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Old 12-21-2018, 08:27 PM   #16
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Re: New LS for my 72 blazer

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Mine required the lift. It was really close to the pumpkin.
Wow - thanks for this info. Iíd like to go with the pac fab crossmember but donít want to lift my blazer. Didnít realize it would be that close. They do recommend at least 2Ē lift right?
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Old 12-22-2018, 01:25 AM   #17
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Re: New LS for my 72 blazer

I believe they said 2.5” is minimum. The DD cross-member is said to not require a lift but I would make sure you are ready to lift it. The cross-member is much wider than stock due to the LS block. It just requires much more room. Also when I lifted mine 3” it looks more like 6” The original springs were pretty saggy.
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Last edited by Blazerowner; 12-22-2018 at 01:32 AM.
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