Lunati Hydraulic Roller Cam
What could we gain using a hydraulic roller cam with similar 0.050-inch tappet lift duration to the hydraulic cam, but having considerably more lift? Namely, 35 hp and 26 lb-ft of torque at the peaks and 21 hp and 25 lb-ft on average. Still, with the same Edelbrock Performer and 1-inch spacer, the engine now clearly preferred a larger 950-cfm carb, making 603 lb-ft and 515 hp in this configuration. Next we tried both the single-plane Victor Jr. and the RPM Air-Gap high-rise dual-plane, both with 1-inch spacers. The Victor Jr. raised output to 611.9 lb-ft and 542.4 hp but lost torque and power below 3,500 rpm. Still, the Victor Jr.'s average torque and power production of 551.1 lb-ft and 419.3 hp was worth about 7 lb-ft and 10 hp over the Performer's 543.9-lb-ft/409.1hp average. At the peaks, the Air-Gap made 2.7 lb-ft more torque, but 6.6 hp less, than the Victor Jr. The Victor Jr. was a tad better than the Air-Gap from 4,100 through 5,900. But looking at overall area under the curve, the RPM did edge out the Victor, generating 4.4 lb-ft and 0.6 hp more throughout the rpm range. The Performer only slightly outperformed the Air-Gap at 2,000, as well as from 2,600 to 3,100 rpm. Advantage: Air-Gap (barely).
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