Originally Posted by not ford
StrokeXD how do you know its over fuleing at lower revs??
Are your eye's are burning at idle?
Also what PV is in it now and whats the idle vac in gear?
Motor feels 'uneven' at cruise rpm ie 2000-3000 with a continous almost stumble feel to it.
A few times the carb has flooded because of poor needle and seat control at the fuel pressure I was running and this excasberated the effect so I'm assuming too rich and not too lean.
Also the exhaust pipe is sootie after a slow cruise, and outside of plugs likewise though centre electrode gets almost too white after a hard run..
Installed a Holley high flow PV 145 - size 45 as vacuum at idle out of gear is 6-7 inches, but can't get it to idle in gear long enough for a reading. Reckon the next thing to try is size 35 because it could be opening at idle and at the above revs when under load.
My gut feeling is its running too rich on primaries and too lean on secondaries with a dodgy, or perhaps too high, PV...
Possibly could get it all sorted out easy with a competent dyno analysis but have been a bit disappointed with the last few I've had over here in Perth. One of the more reputable places spent a day on the car with my previous motor combo and I ended up changing all the specs back the way I had it. Seems they tuned it for a technically correct air/fuel ratio rather than outright grunt like I'm after.
Don't suppose anyone out there knows of a decent dyno tuner in Perth?