They used solid for awhile, pretty sure they went back to an updated spring loaded isolator

 

Yep, LA is correct, <sigh> again.


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Buy a solid one and replace the spring loaded one from your factory replacement as soon as you get it. I drove home from the dealer and immediately pulled the snout for a pulley swap. Yep, new/old spring isolator. Went right into the trash.

 

Lol.. Well that's the plan cause you gotta take the snout off for a pulley swap which I plan on doing this winter. You know what messes me up is what is GM thinking throwing in a spring loaded isolater back in there knowing it's probably going to do the same thing again. I don't get it.

 

If you want help, send that blower to me. I'll change the coupler, the pulley, and lighten it up by a pound or two. .


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I know your specialty is porting correct? Shoot me a figure over, I wasn't planing on porting but if the price is right I might.

 

But say you throw in a smaller upper pulley no noise with a solid Iso?

 

Correct, that is raising the ratio and moving the harmonic out of the idle RPM range.

 

Gotcha, good info sir.

 

I would recommend the Lingenfelter Performance solid iso (the "skeletonized" looking one).