Quick question along those lines... I may be helping someone out on finishing up a 505 RB short block. Track mostly but with limited street driving. It has Mahle pistons, 4-1/4 crank, and 7.1 inch rods and was set to run 11:1 with 72cc chambers and a .040 head gasket. Camshaft is a Comp solid roller .660 lift 252/263@ .050 on a 108. It’s already installed in the complete assembly so it will probably not get changed. What do you like? TFS 240, 270 (what I'm leaning toward), or something else? Vehicle weight is probably going to be 3600 plus. ‘89 D-150, built 727 with Turbo Action “J” converter, Four link, gears 4.10-4.88 & 33 inch tire. No fiberglass yet but plenty of lightening.
