I know that this is the internal forum but I thought that someone could help me. I have a ATI super dampner that I am going to install. The first one that I received was too large for they crank and just slipped on. I returned it and recieved another. I took the stock dampner and the ATI to a machine shop and measured the hup. The stock one was 1.4805 inside dia. the ATI one was 1.4815 inside diam. I called ATI and they confirmed that their damper was correct at 1.4815, Can anyone tell me what the dia. is of the crank?
I currently have an ASP pulley on now, and don't want to pull it off to find that the ATI is too large.

 

I don't know the stock diameter, but I am using an ati balancer on my lunati crank and it was a tight fit. I had to boil the hub piece that goes on the crank to get it on.

 

Same here w/ my ATI damper on the stock '01 crank, boiled it for ~15min and still had to use a damper installation tool to pull it onto the crank snout. (I'm too chicken to use the crank bolt to do this).

 

Thanks guys, I will call ARE and ask them to mic a couple of the cranks and see what they are. Did your hubs have a keyway milled into them?

 

My ATI balancer had a keyway, but the stock LS1 crank had no key so it wasn't used.

I brought cyl 1 to TDC firing, and put the balancer's zero mark in a good place to reference TDC later if I needed...aimed it at the nearest timing cover bolt so I can lay a straight-edge across the two.