Motor mount help!!

[LDO]

I purchased the tubular v8 crossmember from classic parts. I also purchased the motor mounts that had a rubber insert that get bolted to the block. This set up allows you to move the motor forward about 3/4 of an inch as well.

I got everything bolted up leveled and tightened up but as I started to lower the engine hoist the motor started to rotate back towards the firewall.
What the heck? There goes my additional clearance...

I thought maybe the crossmember was rotating on the 'collars' but I did this a couple of times and each time the rotation was comming from the motor mount themselves...like the rubber was allowing the rotation.

Could the be bad? they are brand new..
I also have a set of engine mounts with no rubber, it is just a metal plate with the mounting for the large bolt that goes thru the crossmember.....

Need some advice on what to do next, buy new rubber mounts or use the non rubber mounts I already have. Will these transmit more vibes to the truck?

Hoping to hear from guys with experience with this type of crossmember motor mount system.

Thanks,
LDO
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[OrrieG]

Shouldn't your transmission mount determine the angle (rotation of the engine) for final assembly and limit rotation? Ideally your intake should be parallel with the frame rails assuming they are parallel with the ground, this gives your engine a 4 degree angle which in most cases matches the pinion angle.

[LDO]

Originally Posted by OrrieG

Shouldn't your transmission mount determine the angle (rotation of the engine) for final assembly and limit rotation? Ideally your intake should be parallel with the frame rails assuming they are parallel with the ground, this gives your engine a 4 degree angle which in most cases matches the pinion angle.

I removed the trans for some cleaning, etc so once that is re-installed I should be gtg?
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[blue57]

Originally Posted by LDO

I removed the trans for some cleaning, etc so once that is re-installed I should be gtg?
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Thats why your motor is falling back. You need the trans mounted to hold it all together. the motor mounts arent centerd on the block so its bound to rotate rearward.

[LDO]

thanks Blue. That's what I thought butu wasn't sure and figured I'd ask before I invested additional man hours and or money.

[blue57]

Once you get trans back get it all mounted up then recheck your measurements and angle. I didnt and had to learn the hard way by cutting mounts out and am in the process of redoing them now.
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[OrrieG]

dbl post

[mknittle]

Originally Posted by OrrieG

dbl post

I thought I was the only one that did that.