The Final Word
This engine made 1,008 hp at 7,000 rpm and 814 lb-ft of torque at 5,900 rpm during its first full pull on the dyno. The fuel curve looked fairly smooth, but Dave felt there was more power sitting on the table with fuel and timing adjustments. We spent the next 5 hours testing different header designs, various cam and ignition timing maps, and carb jetting changes during more than 30 pulls on the dyno. The motor never dropped below the power level of the first pull. In the end, we discovered this motor liked 29 degrees of timing advance, 2.5 degrees of advance for the camshaft, and 90/97 jetting. It also ran best with 2-1/4-inch primary tube/4-inch collector headers. Advance or retard the ignition timing or cam timing from there, and the power falls off. Allowing the engine to run to 7,300 rpm showed that the power began to fall off just after 7,200 rpm, with a peak of 1,060 hp. The torque peaked at 5,900 rpm with 827.5 lb-ft.