470 runs out of steam at 5100 rpm

Are you running with the cut outs open ? My combo was a 451 with shu's tri-y's.373 gears and running full exhaust it ran 13o's 3600 lbs 65 Belvedere. With open tri-y's,18'' extensions, upped to 4.10's and slicks(26'') it ran 11.90's.Just for reference. 3.55's, what was the trap speed ? Just a guess, how far before you hit the stripe did you shift to high ? Last question, is it falling over at 5,100 and done or is it just not pulling as hard after 5,100 ?I know you mentioned it above,Just trying to think of things it could be. I lied,,one more question. Fuel pump ? mechanical,electric or both ?