Noticed above 4500 RPM I get a bad vibration can't tell if it's engine or driveline, poked my head in out and under the car today put my hands on the vibration balancer. It didn't wobble or anything but I stuck a flashlight behind it and seen the rubber squeezing out. Squeezed my fat fingers behind it and it's definatly rubber/plastic material coming out between the inner and outter rings. Found my vibration issue.. Worn balancer. Here's whats getting me... The balancer that's on the car now measures 6.75" across and just shy of 1.75" ~1.70" thick. I go to order one from summit and it says the stock balancer is 6.75" X 1.25" thick I also checked at the local parts store and other inter web sites all stock 327 balancer are that. Whats up with mine?! I can't find a matching one for my engine. Do I get the stock replacement balancer and order a new crankshaft pulley to match my existing driven equipment? Or does someone know where I can find this odd size balancer? Or should this size never have been on my engine to begin with? Thanks for the help!