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Theres no need to cross bolt the rails the splayed caps are strong enough. The weight of the rails are not that much of an issue plus they also...
While on mag drive subject, heres another option for the olds set up. http://www.trbmachine.com/TRB_Machine/Misc_Parts.html
Satcherate with simplegreen then put it in a box/tub and cover it top and bottom with cat litter or floor dry let it sit for a day or so then take...
Nice. Billet or cast case ?
Agreed , no need to re-cert if not needed but if for whatever reason you do whipple will now re-cert existing a/r980's.
The exhaust ports on the big chief angle down compared to the conventional head.