I've been chasing what I believe to be a lean mis-fire at higher (4,000) RPM and would like some input.
I'm up to .080 jet in all 3 carbs and plugs show it wants more which surprises me so I'm curious what others might be running.
Some Details:
Lumped 194 head w/ 1.94's & 1.5's
Clay Smith Cam - .560 Lift, .231 duration @.050",
Mallory Dual Point, stock coil.
Offenhauser 3x1 , Truck Model B Rochesters non-progressive
5/16" Fuel Line
Stock Manual Pump
Things I've checked/tried fuel related:
Ensured Correct Carb Base Gasket for Power Valve Operation
Float Levels
New Fuel Filter
New Fuel Pump
Vacuum Leaks (none and idles great)
Carbs are synced
Pulled Air Cleaners (thinking restriction)
Isolated Carbs from one another
Fuel Pressure (hard to read with manual pump)
Things I've checked/tried ignition related:
2 other distributors
Different and New Plug Wires
Points
Condenser
The engine acts like it's hitting a rev limiter. Can be going down the road at 3500 and easily throttle it up starts to miss at 4k. Valve springs are good. Recently checked seat and open pressure on two springs (130# seat, 280# open).
Next Steps and your thoughts:
Yet Bigger Jets??
3/8 Fuel Line??
Different Induction?? - I seem to recall these Model B's each being just shy of 200 cfm - should be enough I'd think.
Thanks for your time/input.
