Back in the late 80s I met a gentleman who had, at that time, the "Worlds Fastest Buick GS". Owned a parts store/shop near a dealership I worked at. We were there one day at lunch while they were prepping the car for a race and I noticed a lot of aftermarket bolts on it. He said he had replaced all the bolts with ones just long enough to do the job. It took 22 lbs. off the car, IIRC.
I haven't followed the whole thread so if this has already been mentioned, sorry.

Tim