Swap and Clamshell Mounts
Swap and Clamshell Mounts 1978 Impala, Has factory "Clamshell" mounts. not sure if there is a more proper name, but this is what i have always heard them called.
Getting ready to actually start putting my engine in the car, but i cannot find the info i need. Apparently there are a few different kinds of the factory mounts. I know the trucks were taller. Basically, trying to figure out exactly what i need to buy.
I know Hooker makes some, p/n 12621HKR, but trying to avoid buying them as i already have the generic LS to SBC swap mounts. Hoping to buy just the engine side mounts i need, or conversely a different frame side mount to use my already purchased mounts, which are too narrow for the 4" wide clamshells.
anyone who has dealt with the before have a good solution other than the above hooker mounts?
found these on summit, but not sure if they are the correct ones due to i already know there are a few different kinds.
https://www.summitracing.com/parts/o...xoCCq0QAvD_BwE
Thanks in advance.
Getting ready to actually start putting my engine in the car, but i cannot find the info i need. Apparently there are a few different kinds of the factory mounts. I know the trucks were taller. Basically, trying to figure out exactly what i need to buy.
I know Hooker makes some, p/n 12621HKR, but trying to avoid buying them as i already have the generic LS to SBC swap mounts. Hoping to buy just the engine side mounts i need, or conversely a different frame side mount to use my already purchased mounts, which are too narrow for the 4" wide clamshells.
anyone who has dealt with the before have a good solution other than the above hooker mounts?
found these on summit, but not sure if they are the correct ones due to i already know there are a few different kinds.
https://www.summitracing.com/parts/o...xoCCq0QAvD_BwE
Thanks in advance.
1978 Impala, Has factory "Clamshell" mounts. not sure if there is a more proper name, but this is what i have always heard them called.
Getting ready to actually start putting my engine in the car, but i cannot find the info i need. Apparently there are a few different kinds of the factory mounts. I know the trucks were taller. Basically, trying to figure out exactly what i need to buy.
I know Hooker makes some, p/n 12621HKR, but trying to avoid buying them as i already have the generic LS to SBC swap mounts. Hoping to buy just the engine side mounts i need, or conversely a different frame side mount to use my already purchased mounts, which are too narrow for the 4" wide clamshells.
anyone who has dealt with the before have a good solution other than the above hooker mounts?
found these on summit, but not sure if they are the correct ones due to i already know there are a few different kinds.
https://www.summitracing.com/parts/o...xoCCq0QAvD_BwE
Thanks in advance.
Getting ready to actually start putting my engine in the car, but i cannot find the info i need. Apparently there are a few different kinds of the factory mounts. I know the trucks were taller. Basically, trying to figure out exactly what i need to buy.
I know Hooker makes some, p/n 12621HKR, but trying to avoid buying them as i already have the generic LS to SBC swap mounts. Hoping to buy just the engine side mounts i need, or conversely a different frame side mount to use my already purchased mounts, which are too narrow for the 4" wide clamshells.
anyone who has dealt with the before have a good solution other than the above hooker mounts?
found these on summit, but not sure if they are the correct ones due to i already know there are a few different kinds.
https://www.summitracing.com/parts/o...xoCCq0QAvD_BwE
Thanks in advance.
Andrew
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
Hooker might raise the engine by .5", but combined with their tranny mount, keeps driveline angles where they should be. They have done the best job of making pieces that work together for a clean swap.
after a bit more research, the 12621 is the P/N for truck mounts. the closest i can find may be their 12643hkr, which are made for a G body car.
On The Tree
Joined: Sep 2009
Posts: 155
Likes: 39
From: ELGIN IL
There are a bunch of different part number clamshell tops. All of the frame side lowers are the same for that style mounts, the uppers are not the same. I'd get something like Dirty Dingo adapter plates. The 1/4 inch or so isn't usually a problem. It's at an angle and won't lift the full thickness anyway. I used the old style adapter plate before and you had to redrill the frame mounts. That was not fun.
There are a bunch of different part number clamshell tops. All of the frame side lowers are the same for that style mounts, the uppers are not the same. I'd get something like Dirty Dingo adapter plates. The 1/4 inch or so isn't usually a problem. It's at an angle and won't lift the full thickness anyway. I used the old style adapter plate before and you had to redrill the frame mounts. That was not fun.
The issue is i do not have the upper brackets for the car. I know the lowers are the same, but uppers are different. i do not have the uppers and they are no longer made. So i need to find the correct mounts to use.
I have the general adapter plates, but no mounts to bolt to them as they did not come with my roller of a car. I'm not worried about the 1/4" I just need to get it mounted up
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Verdad Gallardo Might have found a solution with a trans-dapt part 4233 than replaced the frame side clamshell with a solid mount, then allows you to use the older "short and wide" cushioned engine side mount.
That, or i'll just buy some tube and some rubber bushing to make my own from scratch. Just hoping to save a step and get something more off the shelf, and not spend a ton.
Rather than me ramble on and on you may possibly find some things in my thread of interest.
https://ls1tech.com/forums/conversio...3-4l60e-8.html
https://ls1tech.com/forums/conversio...3-4l60e-8.html
Last edited by Vetteman61; Feb 3, 2019 at 09:03 PM.
Rather than go on and on you may possibly find some things in my thread of interest.
https://ls1tech.com/forums/conversio...3-4l60e-8.html
https://ls1tech.com/forums/conversio...3-4l60e-8.html
i was actually just going through your thread a bit earlier tonight. I saw you had used the actual B-body swap mounts. I'm sure i'll be referencing it quite often in the coming weeks as i continue with my build.
Just hoping for a bit more off the shelf, I saw those mounts are $300. I can make them for much less, but was more or less trying to save some time and order something.
If i can't figure out an off the shelf solution in the next day or so, i'll whip some up myself. some stuff i make for the novelty of it, other stuff i make because i can much cheaper than buying, but engine mounts i was hoping would be simpler to just buy and it is a part that the novelty is not much on a seldom seen part.
The frame side mounts' rubber is pretty bad if original.
If the frame is broader at the cradle, then the Spohn frame side mounts, and the 98-02 Camaro rubber clamshell mounts won't work without spacing. If it's not, I like their design. Or copying it with some plate to fit your application.
Since you may or may not care about any of that, the 77-93 engine side mounts are more than likely the same. And that chassis was quite similar to the 73-77 A-body. There's nothing preventing you from finding the parts you want online, used.
If the frame is broader at the cradle, then the Spohn frame side mounts, and the 98-02 Camaro rubber clamshell mounts won't work without spacing. If it's not, I like their design. Or copying it with some plate to fit your application.
Since you may or may not care about any of that, the 77-93 engine side mounts are more than likely the same. And that chassis was quite similar to the 73-77 A-body. There's nothing preventing you from finding the parts you want online, used.
Why not just make your own mounts? I've done that for years and I'm able to place the drivetrain exactly where I want it each time. I can whip them up faster and cheaper than I can buy them - if I can even buy them for the vehicle I'm working on which I usually can't.
Pics of what exactly? I currently have these plates https://www.lsxinnovations.com/produ...n-swap-plates/ and these mounts for the engine side https://www.ebay.com/itm/Pair-of-Che...YRy2:rk:3:pf:0 That i bought before realizing the solid motor mounts will not work with the Clamshell's.
Rubber mounts in the car are good. Issue with looking online for them used are many people list them generically, though they can be pretty specific for the application. I know my car uses the same size left and right, but many had different mounts on either side of the engine, even including later model B-bodies though they share a very similar chassis. Truck mounts, while very similar are too tall and mess with the spacing. There are many variations of the brackets, so used online is still a guessing game as to if they are correct or not.
This looks as if what it will come down to. I have no issue making them, was just hoping to buy something to save a bit of time. Working on the car in one place, all my metal working tools are in another place. Never thought the clamshell brackets were going to cause this much headache.
Off to the fab shop to build a few custom mounts it looks like.
The frame side mounts' rubber is pretty bad if original.
If the frame is broader at the cradle, then the Spohn frame side mounts, and the 98-02 Camaro rubber clamshell mounts won't work without spacing. If it's not, I like their design. Or copying it with some plate to fit your application.
Since you may or may not care about any of that, the 77-93 engine side mounts are more than likely the same. And that chassis was quite similar to the 73-77 A-body. There's nothing preventing you from finding the parts you want online, used.
If the frame is broader at the cradle, then the Spohn frame side mounts, and the 98-02 Camaro rubber clamshell mounts won't work without spacing. If it's not, I like their design. Or copying it with some plate to fit your application.
Since you may or may not care about any of that, the 77-93 engine side mounts are more than likely the same. And that chassis was quite similar to the 73-77 A-body. There's nothing preventing you from finding the parts you want online, used.
Why not just make your own mounts? I've done that for years and I'm able to place the drivetrain exactly where I want it each time. I can whip them up faster and cheaper than I can buy them - if I can even buy them for the vehicle I'm working on which I usually can't.
Off to the fab shop to build a few custom mounts it looks like.
Thanks for the replies.
Just ordered some tub bushing material to whip up a couple frame side tube mounts and just use the conversion plates and SBC mounts i already have.
Just ordered some tub bushing material to whip up a couple frame side tube mounts and just use the conversion plates and SBC mounts i already have.
yes,
Here is the start to my thus far fairly unproductive build thread.
https://ls1tech.com/forums/conversio...wap-build.html
Here is the start to my thus far fairly unproductive build thread.
https://ls1tech.com/forums/conversio...wap-build.html