72 Sm. Blk. Motor Mount Bolts

[Edward J.]

Which Direction Do The Bolt Heads Face On My Small Blk. On Driver And Pass.motor Mounts, The Bolt On Pass Side Seems To Be 1/16 In. Away From Pump Body ( Head Of Bolt Is Facing Toward The Starter. Thanks Ed

[Patrick H.]

Re: 72 Sm. Blk. Motor Mount Bolts

Ed,

I don't recall, but I know that the correct orientation is in the AIM. Also, they really only "fit" one way.

Also, see attached pic regarding your question of a week or two ago.

Patrick

[Rich P.]

Re: 72 Sm. Blk. Motor Mount Bolts

Ed,

passenger side bolt is installed from the back to front. This is done in order to be able to remove it while the fuel pump is still installed.
The drivers bolt is installed in the oppisite direction.
You should check to see that you have the correct bolts. Replacement bolts are longer and are grade 8 not grade 5 like original. Also the replacements are coarse thread (7/16-14) instead of fine thread (7/16-20) like the originals.

Hope this helps, Rich

[Edward J.]

Re: 72 Sm. Blk. Motor Mount Bolts

Thanks For The Replys Guys Pat I Did Catch A Veiw Of The Pass Side Mount Bolt, I Guess Mine In Is Correct, But Idont Think The Drivers Installed Correctly, Rich Ill Check The Grade Of Bolts, But I Beleive There Correct But Im Not Sure That The Bolts Are Suppose To Be The Fine Thread, Im Almost Postive There The Course Thread.

[Rich P.]

Re: 72 Sm. Blk. Motor Mount Bolts

Ed,

I don't have a 72 AIM handy BUT I do have a 69 AIM here. The bolt pt # is 3958007 and the nut is 272876. Now I am 100% sure they are fine thread and the nut is a mardsan (sp)? with fine slits on the hexes. Now if your 72 AIM gives the same part # then they are fine thread. As I am not positive when they started using the safety locking motor mounts.

Hope this helps.
Rich

[Edward J.]

Re: 72 Sm. Blk. Motor Mount Bolts

Rich, 72 Aim Manuel Shows A Part#399803 Bolt,9422299 Nut. Also I Guess In 69 The Drivers Bolt Goes Through Differently, Aim Shows Only A Picture Of The Drivers Side Mount And The Bolt Goes Through The Same As The Pass. Side, Thanks For Your Help Rich.

[Rich P.]

Re: 72 Sm. Blk. Motor Mount Bolts

Ed,

Thanks for the 72 PT# to clear that up (that means that your bolt should be grade 8 and not grade 5 like I had said earlier).
The 69 AIM shows the same picture for the drivers side mount and that is incorrect as the bolt should go from fron to rear. There are many little mistakes like this in different AIM's. So I can't say with certanty that the dr bolt for a 72 goes from front to rear but I am pretty sure it does.

What is the PT# for the motor mount in the 72 AIM. 69 has it as 3977767.

Rich.

[Edward J.]

Re: 72 Sm. Blk. Motor Mount Bolts

3980701 Mount Part # , Thanks For The Info On Mount, Ill Have To Switch The Drivers Mount Bolt.

[Terry M.]

Re: 72 Sm. Blk. Motor Mount Bolts

1970 Corvette had locking motor mounts, 1969 did not.

[Edward J.]

Re: 72 Sm. Blk. Motor Mount Bolts

Terry And Rich , What Do You Think Of The Drivers Motor Mount Bolt, Does The Head Face The Front Or Rear, Aim Shows It Facing The Rear. I Looked At It Today The P/strg. Pump Seems To Be A Clearance Problem To Face The Front.

[Dick W.]

Re: 72 Sm. Blk. Motor Mount Bolts

As posted the RH bolt is installed from the rear, the LH is installed from the front. Quite a few make it to the judging field installed incorrectly. The LH just will the P.S. pump. I have had enough of them out over the years. Now for replacing the freeze plugs.............

[Edward J.]

Re: 72 Sm. Blk. Motor Mount Bolts

Dick, Thanks For The Reply Another Opinion Is What I Needed, I Will Make The Correction, Maybe Ill Loosen The Pump Belt And See If I Can Swing It Away From The Bolt Head.

[Dick W.]

Re: 72 Sm. Blk. Motor Mount Bolts

If you have the correct bolt, you should be able to get it in.

[Edward J.]

Re: 72 Sm. Blk. Motor Mount Bolts

Dick, Im Sure There The Original Bolts And Nuts .i Measures The Clearance Its About 4" From Pump To Mount The Bolts Are About 4 1/2" Long , Close, Its Just Looks Deceiving.thanks Ed

[Dick W.]

Re: 72 Sm. Blk. Motor Mount Bolts

The last one I did, about two years ago, the best that I can remember you can cock the bolt to the side to start it in. But then again, I do suffer from NCRS (never can remember squat) disease