We have dyno sheets on several of these from carbureted to fuel injection. We now have dyno sheets posted on our website at
www.keithcraft.com. The standard 427 engine with about 10.3 to 1 compression with our middle hydraulic camshaft makes about 580HP and 565 ft/lbs of torque. We have these engines go over 600HP with a little bigger camshaft and a up-grade on the heads. We also do a high-rev lifter option for about 200.00 that lets the engine rev higher to like 6800-7000rpms with hydraulic roller lifters and take the HP up as well. We have done some with the dual plane intake and a smaller camshaft and still make 560HP and about 580 on torque.
We custom build our engines for each customers wants and needs, not just a cookie cutter engine. Hope this helps some and fell free to call with any questions. Thanks, Keith Craft