Check the gap of your oil pan to center link and see if they are touching or very close to touching? Does your fan hit or come very close to hitting the bottom of your fan shroud? Does your ride the make noise when you put your tranny in reverse? Do your aftermarket headers hit or come very close to your frame? If you said YES to any of these, the cradle of your frame is sagging from supporting your engine all of these years. I have a solution for you? Purchase my frame spacer plates and insert them between your cradle & frame brackets. Made of thick ?? steel, these plates are used on ALL Pontiac engines for the Pontiac ?A? body models except for the 455 mounts. I?ve sold 87 sets so far and those who have purchased them from me (even the GeeTO Tiger has it!) said they cured the embarrassing noise that their ride made while at car shows. For only $45 (shipping included) you can have this set delivered to you via USPS Priority mail to your door. Contact Mike by sending an e-mail to firstname.lastname@example.org or calling/text at 215-896-5379 and recite this #MSGTO69. Thanks & Happy motoring..!