Q&A / Tech

Mailbag: Building Streetable Power at High Altitudes

You’ve got questions. We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re helping an El Camino breathe in high altitude.

P.M. Carson City, NV

Q: I have a 1968 El Camino with a .030-inch over 350 engine and a TH-400 transmission. I’m also running a Summit Racing cam and the cylinder heads have been ported and polished. Can you recommend a good intake manifold, and what size carburetor should I choose? The car is street driven and I live in Nevada where the elevation is 4,500 feet above sea level.

A: For performance street driving, we recommend the Edelbrock Performer RPM intake manifold. The dual-plane aluminum intake manifold has an rpm range of 1,500-6,500 and serves up solid top-end power combined with excellent throttle response. We’d go with a 600 cfm carburetor like the SUM-M08600VS, but you’ll have to drop down two jet sizes due to the high elevation.

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