Backfire on Deceleration

carmine · #1 (**permalink**) 04-02-2009, 09:56 AM

Cam looks good.

What kind of webers, 48ida or idf and what venturi size and jetting.

onefastmustang · #2 (**permalink**) 04-02-2009, 10:24 AM

Quote:

Originally Posted by carmine

Cam looks good.

What kind of webers, 48ida or idf and what venturi size and jetting.

They are 48IDA carbs.. From memory here is what is in there now..

Main Venturi: 37
Aux Venturi: 4.5
Main Jet: 155
Emulsion Tube: F16
Air Corrector: 175
Idle Jet: 65F10
Idle Jet Holder: 120
Pump Jet: 50
Exhaust Valve: 000
Needle and Seat: 2.00

carmine · #3 (**permalink**) 04-02-2009, 12:02 PM

Looks good.

I would recomend changing your venturi size to say 38 or as high as 40.

But for now re-check your syncronization using a syncrometer with engine hot.

And get your self an air /fuel ratio meter. Very helpful with webers.

PS. remember that if you change venturi size that can affect making changes to jetting sizes and air correctors on idle circuit and main circuit.