After third try, LS3 STILL won't go in

[absinthe]

use the preload plates! without them the poly will literally come apart on the first rev.

I was having the same problem with mine and here are some of the solutions possible to you that I tried:

1. Energy suspension makes an adapter plate kit that is the mount and adapter plate. Thay are built without the preload plate and "skinny" up the mounts.

2. Check to make sure you have the right ones---there are "tall-narrow" and "short-wide"

[Mkelcy]

Originally Posted by absinthe

use the preload plates! without them the poly will literally come apart on the first rev.

I was having the same problem with mine and here are some of the solutions possible to you that I tried:

1. Energy suspension makes an adapter plate kit that is the mount and adapter plate. Thay are built without the preload plate and "skinny" up the mounts.

2. Check to make sure you have the right ones---there are "tall-narrow" and "short-wide"

Why wouldn't the solid aluminum adapter plates provide the same preload as the preload plates?

[ModernMuseum]

Originally Posted by absinthe

use the preload plates! without them the poly will literally come apart on the first rev.

I was having the same problem with mine and here are some of the solutions possible to you that I tried:

1. Energy suspension makes an adapter plate kit that is the mount and adapter plate. Thay are built without the preload plate and "skinny" up the mounts.

2. Check to make sure you have the right ones---there are "tall-narrow" and "short-wide"

Thanks. Do you happen to have the part numbers of the skinny ones?

What about these solid ones that you guys are talking about? Thanks for the replies. This is VERY frustrating

[MarkM66]

Originally Posted by ModernMuseum

Thanks. Do you happen to have the part numbers of the skinny ones?

What about these solid ones that you guys are talking about? Thanks for the replies. This is VERY frustrating

The solid aluminum plate Mike is referring to is that plate you're bolting to your engine, that is suppose to put your LS in the right place.

Remove the plates behind the mounts and see if it fits. I agree with Mike, with them being bolted to a flat solid piece, I don't see why they're needed.

[ModernMuseum]

Originally Posted by MarkM66

The solid aluminum plate Mike is referring to is that plate you're bolting to your engine, that is suppose to put your LS in the right place.

Remove the plates behind the mounts and see if it fits. I agree with Mike, with them being bolted to a flat solid piece, I don't see why they're needed.

Thanks for the replies, gents.

I'll take another look at the mount specifically tonight. I think if you remove the plate though, the rubber doesn't really have any damping qualities.

I spoke to S&P this morning and they are shipping me some "regular" or "original" style mounts. He referred to the ones I currently have (the Energy Suspension mounts shown in the pics) as the "heavy duty" type which may be too thick. When I get them, I'll post up some more pics.

[camcojb]

Originally Posted by ModernMuseum

Thanks for the replies, gents.

I'll take another look at the mount specifically tonight. I think if you remove the plate though, the rubber doesn't really have any damping qualities.

I spoke to S&P this morning and they are shipping me some "regular" or "original" style mounts. He referred to the ones I currently have (the Energy Suspension mounts shown in the pics) as the "heavy duty" type which may be too thick. When I get them, I'll post up some more pics.

you cannot interchange short and wide with tall and narrow, unless you change the frame mounts also. If these fit over the frame pads snugly (not a 1/4" gap or so) then they are correct. Hopefully the original style mounts solve the issue.

[MarkM66]

Originally Posted by ModernMuseum

Thanks for the replies, gents.

I'll take another look at the mount specifically tonight. I think if you remove the plate though, the rubber doesn't really have any damping qualities.

I spoke to S&P this morning and they are shipping me some "regular" or "original" style mounts. He referred to the ones I currently have (the Energy Suspension mounts shown in the pics) as the "heavy duty" type which may be too thick. When I get them, I'll post up some more pics.

Those plates that come with the ES mounts are to stop the mount from distorting when bolted directly to an engine block. Since most engine blocks use mounting bossed which extend from the block.

If you bolt them to a adapter plate, these would not be needed.

The "dampening qualities" come from the poly material inside the mount.

[ModernMuseum]

Originally Posted by MarkM66

Those plates that come with the ES mounts are to stop the mount from distorting when bolted directly to an engine block. Since most engine blocks use mounting bossed which extend from the block.

If you bolt them to a adapter plate, these would not be needed.

The "dampening qualities" come from the poly material inside the mount.

Ahh, I gotcha. I'll probably try it with the mounts that I have then without the compression plate before I try the other ones. I think they 'might' fit without the compression plates.

I took some quick dimensions of my pedestals, which are as follows:

Driver's side:
2.5" tall
2-5/8" width

Passenger's side:
2.75" tall
2-5/8" width

The energy suspension mounts I have right now are pretty much 2-5/8" wide as well, so the fit is very snug.

[Rybar]

Todd is correct, I wrecked two sets of the poly mounts before switching to solid. But the mounts felt fine to me, I never noticed any issues until a buddy pointed it out to me, so maybe the preload plates are needed? But I had the same issue as the OP, the motor wouldn't fit with them.