Well today I got it fired up and running decent. Did a few burnouts at the house lol. Did notice under heavy fast accel it wants to backfire through the carb and sputter then catch up. Is that indicative of too much timing.
that a sign of it being too lean at the moment. the accelerator pump is not initiating the squirt quick enough. check the adjustment for the accelerator pumps
a back fire through the carb is a lean condition. the volume going in may not be enough. a larger squirter may be the solution.
Stepped up to the 37 and 40 squirter and at about half accel it stutters and backfires through the carb. Pulled some timing out of it and tried again but got the same result. This carb ran almost perfect on the 351w no way this 302 needs more then the mild 351w in the way of fuel. Looks like I'm gonna have to pull the timing cover and make sure cam timing isn't an issue.
I will tell you my experience, the 351w when I first put it in, did the same thing, I changed carbs, nothing changed, I changed heads, still no change, I had the Duraspark ignition, I changed the "brain box" nothing changed, I finally had a weird dream and woke up thinking distributor, ordered a Pertronix and installed it, WOW off I went, ran like a dream! I had the same kinda problem, I thought valve train, carb, brain box...............
Well I have several distributors so I'll try one. The msd looks feels and acts fine according to the timing light.
Turns out my other roller dizzy is a 93-94 5.0 dizzy. Which two wires should I use to connect to my Mallory box? There are the following wires: 2 green 1 red 1 solid black writing on it ( cl1251 xlpe) 2 black with forest green stripes 1 black with white stripe writing ( Dixie wire m ) 1 of the green wires say Dixie wire m and the other says 600v xlpe Hmmmm lol
None of them, there is no advance system in those dist, handled by PCM... For a temporary test you can use a iron gear dist, takes 10-15K mi to wear out the gear...
My only ironngear dizzy has a petronix which means rewiring my box. Guess I'll see if any buddies have one.
So here is a few things of value I'd like to share to see if that might help diagnose my issue. Tried two good working carbs and both backfire no matter timing adjustments. Car starts just fine and idles fine after 20-30 seconds of warm up. No backfire in park all the way through the rpm range All the problems rear there head on the road under load. Small amounts of throttle are fine.....moderate to heavy accel cause it to spit and sputter and backfire through carb and it doesn't want to accelerate. I've got two possible things to check out...... I put 1.6 ford racing roller rockers on with no shims and thinking they mightbneed shimmed and be a tad to tight. Also slightly suspect the mallory ignition box. Not sure how to trouble shoot that so I will borrow a hei dizzy and bypass my box.
Sounds like its running lean, or has a valve issue. Have you checked for vacuum leaks? Have you hooked up a vac gauge? If you have a bouncing gauge it would point towards a valve issue
I have a vac gauge in the interior of the car....well its a boost gauge but it doesn't appear to bounce in the manner a bad valve would. I get a steady 1hg fluctuation thats probably due to the trick flow stage 1 cam. Vac gauge reads just as my previous flat tappet motor with a similar cam.
