First off let me say this in not for a third gen. The car in question is a 55 chevy belair. I recently installed a single carb weiand tunnel ram on the 350 in the car to replace the edelbrock performer that was on there. A friend sold it to me real cheap and it looks really good under the hood. Anyways the car is a four speed manual so the car is not any slower, nor is it any faster. Well now I'm ready to do a rebuild and want to optimize the manifold to a cam. I plan to go at least .30 over or more, the gears will be 3.73 or 4.11. The heads are the old double hump fuely W/2.02-1.60 valves. I will do a mild port and polish on them with a freashing up if cheap enough, or get some S/R torquer's if the cost get's within $200. I have a holly 650(mec). My question is what lift/duration and lobe sep angle do tunnel rams like. I have no idea, I only know about TPI motors. All my carb knowledge has faded away. Any insight would be greatly apprecieated. Thanks. Mike

Something that starts to build power above 3500 rpm. An XE294 would be a good choice. Don't expect a mild cam to work with a tunnel ram on the street and get a good idle and fuel milage. Tunnel rams are strictly for racing and need to be put on an engine designed for that. Single carb versions are poor choices. They cause the air to move around corners and restrict the direct flow and main purpose of having a tunnel ram.

------------------
Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley