FE 390 with 48IDA - need help for setting

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09-07-2014, 01:08 PM

Stephan427SC Stephan427SC is offline

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Join Date: Oct 2007

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FE 390 with 48IDA - need help for setting

Hi guys,
I have a FE390 stroked to 454cui with 4 48IDA Webers on top. Actually I try to find agood setting of A/F ratio....
Here is what I have : IdleJets : 60 / 70F10, Main jets : F11/75, cam110.
I turned in all idlejets screws and turned them out 1 full turn. Engins runs good and blows a little bit black dust out of pipe while acceleration.....but when I relese the gas pedal the the engine "bangs" out of the pipes ! What do you think is the problem ? Any help and suggestions would be fine - Thanks !

Best,

Stephan

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