You get more torque with a bigger stroke and the benefit of that higher displacement is that torque is anticipated. When you couple it with a mild camshaft, moderate compression, and street hardware, you get the maximum reliability, very smooth running operation, and in our case, over 575hp. For those of you who are counting, that's still more than one horsepower per cubic inch. That, with a mere 9.5:1 compression-it'll run on any gasoline in the world. Best of all, while premium components are used, the engine internals are far from exotic.
To gain the torque figures that would test transmission and the abilities of driveline components, Ken proved that it can be done with off-the-shelf parts. To gain high-horsepower at the sacrifice of torque, even larger heads, race compression, and radical roller cams would get this same displacement right up to the 800hp. But torque rules the street.
Dyno ResultsThe goal was torque and Ken Lazzeri certainly made good on his promise. Ken says, "Indy Cylinder Head has built many of these engines at 500ci, and we wanted to know what would happen if we did a 542. The result was that the torque went way up. With the 500ci combination, 600-610 lb-ft is about the max. The additional 42 cubic inches proves that there's no replacement for displacement as Ken went up to 700 lb-ft with this combination.
All results gained from Indy Cylinder Head 300 rpm/second Acceleration Test conducted on SuperFlow 901 dynomometer.