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Old 05-04-2009, 12:02 PM
hotrod389 hotrod389 is offline
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im running a 389 in my 68 tempest, super comp headers, stainless 3" exhaust with delta 40's and a x pipe.

when im cruzing, and let off the accelerator, it will idle down and will emit a low but distinct "boom".

when i smash the throttle, she runs like a bat outta hell.

sometimes when cruzing on the freeway it will make other people look.

i tried to solve this problem by isolating plug wires, changing timing and even rejetting my carb...

nothing worked, it has a pretty radical cam in it ( 290 dur @ 050, with .525 lift 112 centers).

since it didnt hurt peformance, ive learned to live with it.
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