Quote:
Originally Posted by 'ol Pinion head
Thanks Dennis, makes a lot of sense, getting closer. Have the '70-72 Pontiac A-body AMA sheets as well. Believe your a little heavy on the (+) for the 12 bolt, will weigh the 71 Coupe's XUK as its currently on the bench. In shipping fresh restored posi rears over the years, have noted a '71-72 8.5 A-body posi rear weighs about 6 -10 lbs more than same width similar ratio stock housing 12 bolt posi rear. Gray iron Pontiac 8.2 10 bolts, definitely lighter than both. Noticed an add of 28.6 lbs was overlooked by Pontiac for dual exhaust on 233-235-237 series on the '70 AMA sheet. That is the number on the '71 AMA sheet & was optional both years exc where std (& slightly heavier) on GTO & GT-37. Am working up more detailed exhaust weights, both for original stock dual exhaust & for exact aluminized version with long case Dynomax Super Turbo's. Working on a mandrel bent, while more correct shaped 2.5" system system as well.
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Roger, That's right...no dual exhaust option for the non-GTO's. The exhaust on it when it was weighted is an X-pipe system with huge and heavy 24" x 6" x 11" stainless steel Magnaflows for trucks. The exhaust system weighs at least 60lbs.(!) the mufflers weighing a good 15 lbs. each. I'm ditching the X-pipe and using 18" DynoMax Ultra-Flo's (all 2 1/2" mandrel pipe).
Dennis