You’ve got questions. We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re prepping an engine for optimal supercharger performance.
A.C. Barranquitas, PR
Q: I have a 1977 Chevy Nova. It is primarily for drag racing, though I do run it on the street occasionally. I want to build a 383 small block with 6-inch connecting rods and a supercharger. From what I have read, this combination has a problem. The recommended cam centerline for the supercharger is 114 degrees, while the ideal centerline for the 383/6-inch rod setup is 105 degrees. Which one do I go with for my engine? Should the cam be roller, hydraulic roller, or standard hydraulic?
I also have a set of S/R Torquer heads. Should I use dished pistons or flat tops? Should I port the heads? How much boost is safe to run with this engine? I also need recommendations on a transmission, torque converter, rear axle gear, and suspension.
A: We’d recommend you ditch the 6-inch rods for a set of 5.7-inch rods and JE blower pistons. Assuming your S/R Torquer heads have a 64cc combustion chamber, JE Pistons part number JEP-131631 will give you 8.5:1 compression, which is ideal for a supercharger. We’d port the heads and run boost between 6 and 10 psi. As for a cam, we’d recommend a Crower standard hydraulic grind with 236-degree duration (@.050 lift), .506-inch lift, and 114-degree centerline. We’d also suggest a Turbo 350 transmission with a manual valve body, 10-inch race torque converter with an “anti-ballooning” plate for use with nitrous and blowers, a 4.56 rear axle gear, and set of lift bars.