Mine on 2 different benches, one was Modern Cylinder Head and the other was Dwayne Porter. Modern flowed the exhaust with a tube where Dwayne did not, that is why the ex numbers vary. Heads are Indy -1's that were hand ported by Barton.


Motor made 850ish HP and is 557 cubes. Pushed my car to 9.ohs and a couple of 8 sec passes at 3000 lbs.


Jim