99bluefirebird

iTrader: (8)

So I will be putting in a new LS6 soon, so the difficult install is not an issue. I can get the prothane poly motor mounts for $65 or I can get a new set of stock rubbers for $130. I have heard the poly gives more vibration but I don't know how much and if its worth it? The car is a daily driver with no track time, but has MAC mid length headers and Y pipe. All input is welcome.

NOBR8KSS

iTrader: (12)

I vote for the poly mounts. I just removed my stock rubber mounts and they were totally trashed...I could wiggle them back and forth in the clamshell about an inch. I installed the poly mounts and while there is more vibration, it should settle down as the mounts break in and loosen up a little.
Actually, I only notice the vibration at idle...anything above 1,000 rpm and there is no vibration.
They are a huge pain to install, so now is the time to do it.

Michael02hawk

iTrader: (26)

Another vote for the Poly Motor Mounts. Since you'll have the engine out, this is the time to do it!

I just had a new set of kooks LT installed 2 weeks ago, along with a change from stock motor mounts to poly mounts.

I didnt even notice a difference in vibration with the poly mounts. More importantly, the poly motor mounts will help eliminate any banging from the y-pipe onto the floor board.

NHRAMAN

iTrader: (1)

When I do mine I am going POLY.

99bluefirebird

iTrader: (8)

So how would the vibration compare to lets say a mild cam? And are you guys running poly tranny mounts too? Are you all using the prothane motor mounts?

Michael02hawk

iTrader: (26)

I tried the poly tranny mount about 3 years ago, on a stock cam...I ripped it out of there after a week. The vibration was horrible!

2000KnightRider

iTrader: (21)

What about Spohn solid motor mounts?

socmguy

iTrader: (18)

Both solid and poly are good. The stock rubber ones are straight crap. Don't put those stockers back in there. My vote is for Poly.

Grifter

iTrader: (12)

I am still waiting to install my Spohn solid mounts. I don't see the point of running poly personally. Too much work for an insert I love the solid feeling.

SleeperD

iTrader: (1)

Poly all the way.