Motor Mounts

1811 Views 14 Replies 6 Participants Last post by stan_the_man, Apr 12, 2009

stan_the_man

Discussion Starter · Apr 9, 2009

So, I have my motor/tranny back in. The pass side header will not clear the trans x-member. I purchased new motor mounts from summit
http://store.summitracing.com/partdetail.asp?autofilter=1&part=PIO-A2292&N=700+0&autoview=sku
and slapped them on there. Didn't notice anything different that would indicate they were Left or Right mounts.

The motor does sit a little crooked in the engine bay, kinda leans toward the driver's side by about 1/4".

Are the engine brackets on the side of the block L and R specific?????

1 - 15 of 15 Posts

Bluesman

· #2 · Apr 10, 2009

I'm a little confused. My headers stop well short of the transmision x-member.

At least I think they do. ...and my motor mounts look way different from yours so I don't know if yours are different right to left.

These are my motor mounts...
http://store.summitracing.com/partd...861902+4294908216+4294907681+115&autoview=sku

stan_the_man

Discussion Starter · #3 · Apr 10, 2009

My headers stop short of the cross member too. When I put the flange on the end of the collector (3-2.5" reducer) it's about 1-2 inches away from the cross member and is the same distance from the floor board as the x-member. If I attach my exhaust pipe it will not pass under it.

Looks like I might have inadvertently switched the motor mount brackets that attach to the block. If they are L/R specific, that could be it.

hope that makes sense

tnblkc230wz

· #4 · Apr 11, 2009

The 73 and 74 frames use the clam shell mounts and they should fite either side.

Slow 73

· #5 · Apr 11, 2009

Thats the correct frame mount for a 73 as I just removed my factory ones today. I dont think they make a pass and a drivers side.....I believe they are interchangeable. Ill look at my old ones tomorrow to see for sure. Did you just re-use your mounts that bolt to the block?

racer77

· #6 · Apr 11, 2009

They are the same for left and right. Are you sure you used the right holes? And do you have 4 bolts in the crossmember? If you only have 2, you might have it too far forward(it could happen). Also make sure both sides are using those little tabs welded off the back of the engine crossmember on the upper bolt holes.Bluesman,yours a aftermarket ,his are stock,that's why they look different.

firebird69racer

· #7 · Apr 11, 2009

racer77 said:
Bluesman,yours a aftermarket ,his are stock,that's why they look different.

No
Bluesman's are 68-72 mounts and Stan's are 73 and up mounts. Thats why they are different

Bluesman

· #8 · Apr 11, 2009

I am sure you guys are right about the differences between a '71 and a '73, but I think I am also mixing them up. Doesn't his link take you to the mounts that bolt to the crossmember? I am looking at the ones that bolt to the engine...the "other half" of the mounts. Sorry about that!

Dave

racer77

· #9 · Apr 11, 2009

AHHH, I can see clearly now...

stan_the_man

Discussion Starter · #10 · Apr 11, 2009 (Edited)

I did reuse my engine mount brackets. I have 4 bolts for my x-member so it's in the right spot. It lines up with the tranny perfect. I also used the welded tabs for the top rear holes of the frame mounts.

I pulled both sides off yesterday and compared what I had on L and R.....

The passenger side frame mount is 1/4" taller than the one that I put on the driver's side. Both are new from summit and had identical part numbers.

The engine brackets that bolt to the side of the block were different too. The one I had on the passenger side was 1/4" to 3/8" of an inch taller than the driver side. These were the mounts on the car when I bought them but I never checked them for differences before I put the motor back in as I thought they are for either side.

I ended up switching only the engine brackets and leaving the slightly taller frame mount on the passenger side. I compared them side by side in that configuration and they appeared to be the same height (assembled). SO I went with it.

I installed them that way and now the motor sits almost level, I'd say within a 1/16" to 1/8" with a slight lean toward the drivers side.

Now I have another question..... Should the center bolt of the balancer/crank line up with the center of the engine bay? (ie crossmember, center of front clip)

My motor is shifter towards the passenger side by about a 1/2" to maybe 3/4".

Thanks for all the replys.

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Bluesman

· #11 · Apr 12, 2009

stan_the_man said:
Now I have another question..... Should the center bolt of the balancer/crank line up with the center of the engine bay? (ie crossmember, center of front clip)

My motor is shifter towards the passenger side by about a 1/2" to maybe 3/4".

Thanks for all the replys.

Not necessarily. These old cars were not put together by brain surgeons. Your drive train may be off-center either at the front or at the rear. Mine was 3/4" to the passenger side at the rear when I measured. I haven't really checked the front, but who's to say the cross member is exactly centered! Hey! It goes down the road...right!!??

That's what U-joints are for, isn't it!!:turn::turn:

Dave

stan_the_man

Discussion Starter · #12 · Apr 12, 2009

Bluesman said:
Not necessarily. These old cars were not put together by brain surgeons. Your drive train may be off-center either at the front or at the rear. Mine was 3/4" to the passenger side at the rear when I measured. I haven't really checked the front, but who's to say the cross member is exactly centered! Hey! It goes down the road...right!!?? That's what U-joints are for, isn't it!!:turn::turn:

Dave

Well, I just went and bought new motor mounts (frame) from AZ. They are identical in every way. I took a closer look at the mounts I got from Summit and the taller one is actually slightly different besides being taller. I'm going with two from AZ, and I'm putting the bigger engine bracket back on the passenger side. That one has a #3998658 on it. I can only find a 72 on the second engine bracket...... i'm putting that one back on the driver side. I believe that the motor will get closer to center as I never noticed the motor that far off of center when I had the mounts on there like that before.

Originally, I had the taller engine bracket with the taller frame mount on the passenger side which is what made the engine lean toward the driver side.

I'll let you know how it turns out. It may be that the engine bracket with #72 on it is from another application because I have found that the #3998658 is the old part number for the passenger side. Correct me if I'm wrong on that one.

Thanks again.

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stan_the_man

Discussion Starter · #13 · Apr 12, 2009

Well, the scenario I mentioned above worked!!! The engine brackets are R/L specific. With the AZ frame mounts (identical in height/size) and the taller engine bracket on the passenger side............. The motor is now level and centered in the engine bay.

What a freaking PITA.... One slightly different frame mount from summit gave me such a problem. Hope this info helps others.

Bluesman

· #14 · Apr 12, 2009

LOL! It sounds like a PITA!:turn: Glad you got it figured out Stan...

Dave

stan_the_man

Discussion Starter · #15 · Apr 12, 2009

Me too. Thanks for all the help Dave.

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