Well, I figured somebody has to be the guinea pig. I bought two Poly motor mounts for an LT1 F-car, the four bolt one PN 3.1116R. These fit in the clamshell perfectly, however they are .3" narrower front to back. With 3 washers they fit perfectly. They are very tight and it will be interesting to see how much vibration they transmit to the chassis. I am waiting on a new TC to get here in the mail before it goes all back together.

I'll keep everyone informed.

Ryan K. <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />

<small>[ July 19, 2002, 09:01 PM: Message edited by: Ryan Karasek ]</small>

 

Keep us informed! I've been looking for a set of poly motor mounts for the LS1. Maybe I can finally take of my ghetto torque strap!

 

Update?

 

Do a search in ext engine. Both Ryan and myself are running the poly motor mounts now <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Been running them for a while now, They are fantastic. No problems whatsoever. Its a long install with the motor in the car but IMO worth it. If you are pulling the motor out, its a no brainer.

Ryan K.

 

What are the pros of this?

 

Pros:

Stiffer means of mounting engine. Less engine motion under loading (helps prevent y-pipe banging common with alot of headers) and will transmit more torque to the driveline instead of twisting the engine.

Con:

Can transmit a bit more vibration to the chassis but ALOT less than solid motor mounts.

 

wouldn't these poly mounts and the solid mounts out casue false knock?

 

Poly mounts will NOT cause false knock. Solid mounts may.

Ryan K.