Slotted holes on GM engine mounts?? - Team Camaro Tech
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post #1 of 5 (permalink) Old Nov 15th, 05, 08:13 AM Thread Starter
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Dave
 
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Slotted holes on GM engine mounts??

I just got some new GM engine mounts for my '68 big-block. My question is this; what do you guys do about the slotted mount holes? Using them would allow the engine to be tilted about 1/4" to one side or the other. I almost like the cheaper Chinese mount holes, because they are centered and will force the engine to be aligned correctly.

I was thinking of centering and tack-welding the mounting-bolt washers right onto the GM mounts, thus forcing the engine into correct alignment. Am I being too fussy?




Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #2 of 5 (permalink) Old Nov 15th, 05, 08:58 AM
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Tom
 
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Talking Re: Slotted holes on GM engine mounts??

IMHO, I wouldn't worry about it. From the pictures, it looks like you are talking about the part that bolts to the frame stands. The frame stands would have to be slotted also, for the engine to move (if the bolt is tight). There is more movement in the rubber (or poly) mount. Make sure you are using Big Block stands, which will offset the motor.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #3 of 5 (permalink) Old Nov 15th, 05, 10:56 AM Thread Starter
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Dave
 
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Re: Slotted holes on GM engine mounts??

The frame mounts are correct for the BB. The holes in the frame mounts are round. I am concerned that the slotted holes in the engine mount would allow the engine to be slightly askew. I think I will center & tack-weld washers onto the engine mounts. That way, everything should be centered upon installation(I hope)..............

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #4 of 5 (permalink) Old Nov 15th, 05, 11:09 AM
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Re: Slotted holes on GM engine mounts??

The oblong holes are that way for a reason, as they actually allow you to level the engine on the frame stands. I just drop the engine down over the towers, get the bolts through, and then use the hoist leveler to get the engine level, set it down and then torque the bolts. They aren't going to move. If there is enough force to overcome the clamping force of properly torqued through bolts, it's certainly going to pop any tack welds.

Eric
69 'vert project big block/TKO 600 RR
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post #5 of 5 (permalink) Old Nov 15th, 05, 07:08 PM Thread Starter
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Dave
 
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Re: Slotted holes on GM engine mounts??

Quote:
Originally Posted by Eric Kammerer
........... If there is enough force to overcome the clamping force of properly torqued through bolts, it's certainly going to pop any tack welds.
No argument there, but at least I will be able to drop the motor in place and have it centered. Once I tighten the bolts, then there will be no strain on the small tack welds.

Alternatively, I could use mounts as they are and offset the engine a little, as the exhaust header is VERY close to the steering box on the driver side. So I think you're right and it may actually be best to use the slots as a way to position engine perfectly.

thanks.....................

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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