Long story short, a guy on here is trying to screw me over on a stock harmonic balancer that he claims is off an fbody. He was advertising it for $25 shipped, i contacted him, sent the money yada yada yada, nothing for about 4 or 5 days then when i confront him he said its not worth his time cause it will cost $20 to ship. So i said whatever and sent an extra $20 (dumb on my part) and recieve it a few days later due to my car about to get towed. Its clearly off a vette due to the backspacing. I sacked up and bought an underdrive pulley and took pics showing the backspacing was different. He claims that wasnt the pulley i sent now. A friend with an fbody counted the "holes" on the front of his and counted 5 or 6 i belive? this one has 20. Anyone have any pics of stock ls1 fbody harmonic balancers or can describe the difference if there are any besides the backspacing? Because this is the only pic i have and it was in his ad. Its clearly the one he sent.

 

 

The balancer in post #2 is stock LS1 F-body.

Yours is not.

 

Stock pulley off my 99 Z28:

 

Thanks alot, this should definitely help.