LS conversion motor mounts?

[Mike_Mc]

Looking for some advice on LS swap motor mounts for my 68 step side? Took out the straight 6 and there are so many companies out there making them. Seeing if anyone had good experience with one company from another.

[nightrider388]

I bought the newest CPP sheet metal engine and frame mounts from summit racing. They fit perfect. My truck is a 70 c10

['70_402]

I've got the CPP mounts also.. perfect fit.

[dgheinen]

Dirty Dingo Sliders look really promising. The nice part about them is that depending on your previous setup, you can just slide the mounts forward and back to hopefully maintain your previous driveshaft. With a lot of the conversion mounts out there, there are only a couple pre drilled mounting locations. With the sliders, you can fit it exactly where you want to.

[Mike_Mc]

CPP were the ones I was leaning towards but just wanted to see if anyone had experience with them. Thanks

[Steve Cole]

Do the CPP mounts put the LS engine in the same position as the stock V8 ?

[nightrider388]

Originally Posted by Steve Cole

Do the CPP mounts put the LS engine in the same position as the stock V8 ?

CPP mounts are adjustable. The frame mounts do go in the stock location. CPP engine mounts are adjustable within reason very similar to the dirty dingo sliders. I chose the cpp mounts because I did not want to drill holes in my cross member. The sheet metal frame mounts bolt in stock location.

[nightrider388]

This might get moved to the LS swap section.

[68Stepbed]

I used these from POL. https://www.performanceonline.com/19...-Brackets-V-8/

They work in either the V8 or 6-cylinder position, clearance for any kind of headers or manifolds, look clean and simple. Don't use the cheap Chinese rubber mounts, though. Go ahead and get the Energy Suspension urethane mount upgrade.

[indymachinist]

I recently dropped my engine in on Early Classic mounts. Its not done yet but I like the way it sits. Fits well with a ctsv pan that is easily available, has room for a low mount a/c compressor with minimal frame tweaking, and allowed a 4l80e to go under a low hump tunnel.

[racecougar]

I used the Speed Engineering adapter plates...they worked well.

[SierraMtns]

Originally Posted by 68Stepbed

I used these from POL. https://www.performanceonline.com/19...-Brackets-V-8/

They work in either the V8 or 6-cylinder position, clearance for any kind of headers or manifolds, look clean and simple. Don't use the cheap Chinese rubber mounts, though. Go ahead and get the Energy Suspension urethane mount upgrade.

Matt,

Did you get the LS Conversion Brackets too? Looks like everything is $284?

[SierraMtns]

Originally Posted by racecougar

I used the Speed Engineering adapter plates...they worked well.

Are these the ones?

https://www.speed-engineering.com/ls...3-ls6-ls9.html

I don't see any for our year trucks.

[racecougar]

Originally Posted by SierraMtns

Are these the ones?

https://www.speed-engineering.com/ls...3-ls6-ls9.html

I don't see any for our year trucks.

Those are the ones. Those pair up to the stock type motor mounts and I-6/V8 perches.

[MDPotter]

Originally Posted by racecougar

Those are the ones. Those pair up to the stock type motor mounts and I-6/V8 perches.

It looks like these worked well for you? I have a 68 C15 and I want to reuse the stock perches (look just like yours-see top picture) but it seems like most of the LS motor mount plates are made for the other type of mount which has a thru-bolt (see bottom picture) rather than the bolt through the back of the motor mount like mine (top picture). I'm told that the 3-bolt pattern is different between the two style mounts too. Do you have the style like mine (top picture)?

[nightrider388]

Originally Posted by MDPotter

It looks like these worked well for you? I have a 68 C15 and I want to reuse the stock perches (look just like yours-see top picture) but it seems like most of the LS motor mount plates are made for the other type of mount which has a thru-bolt (see bottom picture) rather than the bolt through the back of the motor mount like mine (top picture). I'm told that the 3-bolt pattern is different between the two style mounts too. Do you have the style like mine (top picture)?

Attachment 1873006

Attachment 1873007

The 3 bolt part is the part that actually mounts to the LS engine. That bolt pattern will remain the same no matter which mounting style you use. The single through bolt simply attaches to a certain type of frame mount or plate that goes to the cross member. Its just the attachment point style that has to match which frame mounts you have.

[MDPotter]

Originally Posted by nightrider388

The 3 bolt part is the part that actually mounts to the LS engine. That bolt pattern will remain the same no matter which mounting style you use. The single through bolt simply attaches to a certain type of frame mount or plate that goes to the cross member. Its just the attachment point style that has to match which frame mounts you have.

There are (4) bolts that attach the plate to the LS block. What I want to confirm is that the Speed Engineering plates will work the style of SBC mounts I have (single bolt through the face of the stock perches). What racecougar appears to have in his pictures is the same perch and mount I have, but I want to confirm that it worked out for him before I order the Speed Engineering plates.

Are you saying that both types of SBC mounts have the same 3-bolt pattern and will work with any of the LS plates?

[nightrider388]

Well the style I used has a plate that bolts to the (4 bolt) engine side. Then it has the 3 bolt similar to what you have in photo. I'm not saying that they all will fit the same. I know you have to buy the right kind that fits the style of frame mounts you have. I wouldn't personally want the fixed kind. Depending on which style pulleys you have and oil pan, the adjustable ones let you slide them to the front or back as needed to clear firewall and crossmember and pulleys. Sorry to make it sound confusing.

[MDPotter]

Hopefully racecougar responds, but I will probably end up buying the Speed Engineering plates. They aren't sliders like most plates, but they have multiple holes for a total 2-1/4" of adjustment via (4) sets of holes. I'm not running A/C so that will eliminate some of the clearance concerns typical of these trucks.

[nightrider388]

But just guessing. I would say they will all fit the frame side the same. I think basically all the conversion mounts do is flip the ls style to fit a factory configuration. Worst case if it didn't line up, you drill the plates and put the mount where you want it.

[jrusher]

I used the dirty dingo sliders on my 65 they worked awesome was so nice just to quickly slide the engine back and forth to position it . On my wife’s 61 I’m trying the ICT ones off Amazon they have multi holes for different positions

[racecougar]

MDPotter, the Speed Engineering adapter plates will work for your mounts without issue.

[AZ 67 C10]

If you want to use the factory perches and have the bolt through the back of the motor mount use these. https://www.summitracing.com/parts/ens-3-1156g

I used factory perches with those motor mounts on dirty dingo sliders. It can be a pain by yourself to get the bolt lined up going from the perch to the motor mount since you can't really see it.

Do some aftermarket perches that have the bolt through style change the motor height/position compared to the factory perches? I see some people run the AC compressor down low and some move it up because of clearance.

[Nick_c10]

I used the dirty dingo sliders on my 68 and I didn’t like them for a couple reasons. They sit up 1/4 higher than stock so I had to bend the tab back in the transmission tunnel with my 4l60, and also if you want to slide the motor all the way forward you have to trim the passenger side rubber mount. But other than that they worked and looked nice.