The secret is that the GCR requires a minimum 30* angle with respect to the rear hoop on the supporting tubes. If you're short-legged (like me - and I know you are
) you can attach the rear bars to the firewall and still get the 30* by moving the hoop, and the vertical attachment point, slightly forward. Coilovers will save you about 50#. I know the stock tank isn't very heavy - but I have an 8 gallon aluminum cell, which is about 5# lighter, with the mounting hardware - not counting about 5# of metal we removed from the frunk to mount it. My old cage was a beefed-up Autopower bolt-in - 1.5x.120, with an added Petty bar. The new one, despite the "spiderweb" or "star of David" rear diagonal / crossbracing, the dash undertube, and the footwell protection, is almost 40# (net) lighter since we did the NASCAR trick on the driver's side and gutted the door. The chassis is noticeably stiffer, too.
If it had been legal to do the passenger side when we did it, I would have done that one too - saving probably another 25#. I may do that later this year. If my calculations are correct, that would bring the weight to almost exactly 2270# with a 195# driver and no gas. My chassis, in case you don't remember, is an '86 sunroof car - with the sunroof assembly still there, but the glass removed and replaced with an aluminum panel; thus making a de-facto "aftermarket" sunroof - which is bolted in per the GCR. If I decide to go to lighter wheels after that (both the Rev's and the OZ's weigh in at about 14#) , I'll be ballasting even at the new weight.
