onebinky

iTrader: (1)

IIRC, No.

9D1BURD

You are correct, they will work on either side.

Lo-tec

Yes they will fit on either side, but there is a left one and a right one. What the difference is I do not know. If they have #'s cast in them post them and I'll see if I can figure it out.

onebinky

iTrader: (1)

I actually just checked them, and they are different. One is a bit taller taller than the other one, I'll snap some pics and post the stamped numbers tonight if I remember.

Sorry for the mis-info guys.

onebinky

iTrader: (1)

Alright, here's what I got:

14039486 and 334971

It looks almost like one of these may be aftermarket, or at the very least more recent GM parts. One of them had all kinds of scale and rust buildup, one was nearly perfect. Unless it had a nasty oil leak for most of it's life on just the one mount.

I won't know where each one goes until I pull the old motor out of the car, which won't be for a couple days.

onebinky

iTrader: (1)

I tried to post up a couple pics, but it appears that the server is having some difficulties

Apeiron

334970 - Left
14039436 - Right

onebinky

iTrader: (1)

From driver's seat, or from the front of the car? Any idea why those part numbers are so different?

onebinky

iTrader: (1)

Dirk got the attachment thing all fixed

Lo-tec

Left is drivers side, right is pass side.

Apeiron

Left and right are always the car's left and right.

Got TPI?

Just went out and looked at mine, can't see any difference in the mounts on the car or the clamps on the motor. Motor is getting ready to be put in, and this isn't something I want to hit me in the back when I'm trying to drop it in. Is the difference so small that it would be hard to tell which is which?

Lo-tec

There has to be enough difference that GM would make two different parts. I would pull yours and read the part #'s on them, and verify they are on the correct side BEFORE the motor goes in. It would suck a$$ trying to do it later.

Apeiron

The only obvious difference I can see on mine without starting to measure things is that the "ears" where the bolt goes through the left-hand one are bent outwards slighty.

five7kid

iTrader: (14)

So, two left feet would be a good thing?

I never noticed any difference, but then, I've never had mine off!

Got TPI?

Both of mine are bent out slightly. The motor is on a stand so looking at them is no problem, though I don't see a casting number on either of them (they are off the motor). Probably just my haste and paying more attention to their dimensions. They was on the motor when I got it though, stock 1998 vortec 350 out of a ck2500. I can get some pics tommorow to throw up if ya'll think it may help.

Apeiron

Actually, the through-bolt holes are in different locations on the two. The right-hand mount has the holes closer to the block and lower.

onebinky

iTrader: (1)

Here's some closeups of the ears:

onebinky

iTrader: (1)

2

Apeiron

You can see the difference in the hole locations pretty clearly in those pictures.

five7kid

iTrader: (14)

The front crossmember must not be symmetrical. Makes you wonder how many have been crossed over the years producing canted engine installations.

BOTTLEDZ28

iTrader: (9)

well I have had mine off over a dozen times and never noted which side they came off and never had any big problems putting them back on. I have had some small issues getting 1 of the 2 bolts to go through all the way but Im surer everyonehas that problem once in a while. No issues here as far as I know. I started this post becuz I was curious. I wonder how important it really is to have them on the correct sides?

Apeiron

There's been the occasional story of "I swapped engine mounts/engines and now everything sits higher", or "now my headers hit the steering shaft".

allisonguy

My 84Z had the 14039436 on the right,and a 334971 on the left. My question is," What is the trick to getting to the nuts on the bottom of the mounts?" My engine is out and it still looks like a chore to get the mount bolts out. Thanks for any help.

Apeiron

Some people have had luck with a swivel socket and series of extensions to get at the nuts. As long as the car's apart though, it might just be easier to take out the springs.

Got TPI?

Take off the wheels and it's fairly easy if you have a lot of extensions and a swivel head. Key is just take your time, I did mine last Friday and took about 45 min with me by myself first time doing it (taking off the old and putting on the new). Impact wrench speeds up the process. Just take your time and remember it's a PITA!

allisonguy

Thanks for the information. Just went through the engine and the mounts looked pretty sad. Thanks again.

Got TPI?

Finally found camera, mount brackets look the same to me Going to test fit it tommorow to make sure before I get any farther.

Got TPI?

One more

Apeiron

No numbers stamped in them?

Got TPI?

nothing

onebinky

iTrader: (1)

Is it possible that the mounts for the thirdgen F-body are vehicle specific?

Apeiron

I'd say it's probable.

capzoidz84Z

Difference is slight angle and height. Odd number is always left side of vehicle, even number is right side. Just spent a couple hours referencing same question for an 84 Z that I'm putting together. My mounts are numbered 399371, 399372. Hope that helps.

five7kid

iTrader: (14)

Kind of makes you wonder if it's still an issue after almost 7 years.

capzoidz84Z

Supposedly because of direction of tourque..........................................

VincentZ28

iTrader: (2)

The difference is the engine will move either to the left or the right about 1/4in. This is the reason why some people had trouble with SLP 1 3/4 headers hitting the steering shaft and the Super Ram hitting the wiper motor.

austleadfoot

old post i know ,but if i wanted to move the motor to the drivers side 1/4 inch ,i could swap the mount housings over?

austleadfoot

only reason i ask , is the car is converted to right hand drive and having clearence issues with extractors to steering shaft

skinny z

Something I see that no one has mentioned is the 3/16" spacer that's designed to go between the mount and the block.
After the first couple of go rounds installing different engines, I had always noticed the the drivers side valve cover was higher than the passenger side. A level across the carb pad on the intake shows the amount that's it's off.
I found this spacer in my pile of parts and with it's installation in the passenger side, the engine sits perfectly level.
All OEM parts.
The first pic is the with the engine sitting in the mounts without the spacer, the 2nd pic shows the spacer position between the mount and the block.
Result, level.
It also made a difference with the header installation. Before the spacer there was contact with the cross member and the frame. After the spacer was installed, lots of clearence.

Dyno Don

iTrader: (7)