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Old 02-07-2011, 08:44 PM
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The issue you have is too much cam, not enough engine.
To make it idle without pulling from the boosters you`ll have to advance the spark timing alot and likely drill holes in the primary butterflies.
When you move up on cam size, the rest of the engine has to go up with it. Cylinder head flow, compression ratio, exhaust system, ignition system, intake system, transmission and rear gears. You can`t just stuff a big cam in a stock 283 and expect it to run right.
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