Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - back agine still spites back throw the barb at low rpm
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Old 01-17-2004, 01:19 AM
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to run that cam, you`ll have to regear the vehicle, or go with a smaller cam. the cam`s RPM band is lower than the cruise RPM in 4th gear, the cam wasn`t designed to make torque below the given RPM, so it puts the engine under such a load it spits back through the carb. you have way too much cam for a little 302 in a regular geared vehicle. I would think the RPM band of your cam is likely 3000 - 6500 or so, and in 4th gear it cruises at maybe 1800 RPM. it runs fine when you go to a lower gear because it puts the cam back in it`s workable RPM range or closer to it. you`ll either have to get some lower rear gears, or go with a smaller cam, I would do the cam swap. a smaller cam with lower duration at .050 with a RPM band that`s workable with your gears at cruise speed RPM. a cam with a RPM range of 2000-5000 should suit you fine, even if the cruise RPM is slightly lower than 2000 RPM, it`ll still work out okay. if you go with a gear change, you`ll need at least 3.73`s to 4.11`s, this will put the RPM in a much higher cruise speed, which accelerates wear on the engine due to the higher RPM, and creates a very annoying exhaust drone.
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