COMP Cams designed the Thumpr cam to offer the street enthusiast a competition-sounding idle by increasing exhaust lobe duration and tightening the lobe separation angle (LSA). The issue was not with the EFI but rather the camshaft. I tried that exercise several years ago on a small-block Chevy with three different throttle body EFI systems and wasn’t happy with any of them. The first is the choice of the Thumpr cam combined with a throttle body EFI. Jeff Smith: There are a couple of items to discuss. What I want is a system that works well, is reliable, and has good driveability but I’m not necessarily concerned with peak horsepower. Which one of these systems works the best overall? I’m not worried about spending a few more bucks up front. I’m looking at the Fast EZ-EFI, Fi-Tech, and the Holley Sniper. I’m building a street 540 big block Chevy with a mild hydraulic COMP Thumpr cam, rectangle-port heads, and 9.5:1 compression ratio that looks like a stock L88 to go in a 1967 Corvette Coupe. With the mild XR282 cam listed in the chart, this engine exhibits outstanding street manners and runs great. This is the Sniper as it was installed on a big-block Chevy in a ’66 El Camino.
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