Prothane LS1 motor mount insert instructions
Thread Starter
Joined: Aug 2011
Posts: 2,379
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From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Prothane LS1 motor mount insert instructions
Installation went ok didn't need the instructions its pretty straight forward but one question is that does it matter if the tabs face up or down I installed both sides tabs up
any body had instructions , ones ive found at different threads are not clear enough
any body had instructions , ones ive found at different threads are not clear enough
COTM Editor




Joined: Oct 2008
Posts: 1,365
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From: PA
Car: 91/89/85/82 Z28s, 88 TA, 88/88 SC
Engine: SBC and LS variations
Re: Prothane LS1 motor mount insert instructions
they go up
on some k members and other types of mounts there is a notch that the tab rests in as a secondary hanger
here is a pic of a bmr k member... you can see the notch in the engine mount locations on the top of each one, those tabs would sit in there
on some k members and other types of mounts there is a notch that the tab rests in as a secondary hanger
here is a pic of a bmr k member... you can see the notch in the engine mount locations on the top of each one, those tabs would sit in there
Thread Starter
Joined: Aug 2011
Posts: 2,379
Likes: 10
From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: Prothane LS1 motor mount insert instructions
Yea the ls1 swap mounts have notches on top and bottom I see yours have them at the top only
Im using stock k member it looks like one side of the prothane mounts has a longer side than the other which could be a illusion to me lol just dont want the motor to be misaligned
after dropping motor in I realized it and I was like damn hope I don't have to re do this
Im using stock k member it looks like one side of the prothane mounts has a longer side than the other which could be a illusion to me lol just dont want the motor to be misaligned
after dropping motor in I realized it and I was like damn hope I don't have to re do this
Last edited by Zach/90\irocZ; Dec 28, 2013 at 11:26 AM.
Thread Starter
Joined: Aug 2011
Posts: 2,379
Likes: 10
From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: Prothane LS1 motor mount insert instructions
Doesnt matter. The pins help line the engine up on the mounts. As long as they face up when installed on the block, itll work fine. Some Fbody clamshells have a tab on the bottom that identifies F/R. If you get the mount backwards and the tab wont let the mount install properly on the block simply cut it off
Thread Starter
Joined: Aug 2011
Posts: 2,379
Likes: 10
From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: Prothane LS1 motor mount insert instructions
Sigh lol just wanted to be sure ..I didn't have issues with the tabs both sides are facing up
i really didn't want to deal with the mounts again between modifying clamshells and dropping in engine+trans wasn't a easy task by myself and about 4 hours and muscle
thanks
i really didn't want to deal with the mounts again between modifying clamshells and dropping in engine+trans wasn't a easy task by myself and about 4 hours and muscle
thanks
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Thread Starter
Joined: Aug 2011
Posts: 2,379
Likes: 10
From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: Prothane LS1 motor mount insert instructions
Lol good way to put it
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