huttler

I'm having a clearance issue with the passenger side motor mount bracket. The LS3 has an extra bolt hole, and that is preventing my mount bracket from lining up. I have pictures attached. Suggestions please

KBlanke

You are going to have to break out the grinder and notch out the bracket, we had to do the same thing when we put a LS7 in our C5 race car.

huttler

I was considering that, but I was afraid of weakening it. But now that I know someone else has done it, I'm going to get started...

thx for the help

lucky131969

I know this will not be a popular response(knowing how some on this forum love to grind and hack).....but if that is you concern, then have it machined....so you don't have to worry about crack propagation.

glennd

I agree

vettenuts

I think I would template it first with cardboard then figure out the way to make it fit and still preserve the strength.

KBlanke

I said grinder, but we actually used the same bit used for porting heads

Eric D

There is one other option; the bolt boss could be ground down on the block.

Nd4spd2

subscribing

VGLNTE1

I had to do it, and with cutting 1.5 sixty foots, and driving the way I do....it wont break

VGLNTE1

nooooooooooo

Eric D

To each their own, but structurally wise it is the lease compromising modification.

VGLNTE1

see on my above post. there is nothing it effects. ive done my 416, and a 440. both drag race, and on slicks, not the amature crap most do. 0 problems. AND...if it did break, you spend 80 bucks on a new one, and not grind on a multi thousand dollar motor. And to get that boss down far enough for the mount to fit, it would be dangerously close to getting way to thin

Eric D

Well then, with knowing you don't do "the amateur crap that most do" yours is the only way to go! Still doesn't change the fact that cutting the mount bracket compromises more of the structure than removing the boss off the block. It’s not as scary as you might think.

VGLNTE1

ripping off the line would be the most dramatic force to it. and most here just go run on street tires is all I meant. But, to each their own!

clif

Is there another bracket that will work?

Eric D

Cliff, the LS3 Corvette engine mount, part #10349965 for the passenger side might work. The only issue that I'm not sure about is if the LS3 mount will or will not interfere with the a/c compressor mounting used with the LS1 configuration. I believe the mount list for around $80.

People have the choice to cut the bracket, remove the boss from the block, or go with a different mount. Any of these methods will get the job done and it becomes a personal choice. There may be aftermarket mounts that would add to the choices. For me, I would go with removing the boss off of the block, and maintaining the mount intact and save the $80.



Update: I did a little more checking, there should not be any issue with a/c compressor. In fact, changing to the LS3 mount might be the best choice.

vettenuts

Anyone got a photo of this mount for comparison. I am mentally storing information on this

Eric D

huttler

This is what it took for the bracket to fit