Originally Posted by fast68plym heouth
I believe gregsdart runs one in his bracket race BB.

Yes. Inverted flank, .510 lobe, 284 duration at .050 intake, .020 lash with a Jesel 1.7 rocker. Not sure how many grinders now have the ability to grind an inverted flank, and i decided to try it. Exhaust side is 296 @ .050, .019 lash, LSA Is 113. The NET valve lift is .848 intake, .798 exhaust. With the tight lash and high rocker ratio, overlap gets pretty healthy, i am sure. Best peak horsepower of 982 hp was at 110.5 installed and 7600 rpm , but 108 centerline gave gave an increase of horsepower in the midrange of 6200 to 7600, but peak power dropped by 5. This same cam made 926 hp with 440-1 heads and an iron block, all else being the same .
The 982 hp combo is 549 cubes, aluminum BMP block, 15/1 compression, .9mm rings, methanol with Terminater, Wilson ported 3x intake,
572-13 cnc 385 heads.
The 440-1 headed combo, 2.30 intake valves, 550 cubes iron megablock, 15/1 compression, same intake.

Last edited by gregsdart; 01/16/24 08:21 PM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky