10.06 to 1 comp... Solid flat tappet, 238 at .050 and .500 lift on a 108 lca. I ran a 830 annular on it that had the air horn milled, contoured and a K&N stub stack for a while and it was a little faster than my 750HP but it was terrible on fuel even when I cruised like an old lady (10 mpg vs. 15 mpg with the 750) so I sacrificed a little performance for a bunch of fuel mileage since I drive it a lot. Honestly the tricked 830 was a little too much. I think a stock 830 or 850 would have produced as much power but done it more efficiently but I got a super deal on it so I gave it a shot