Thankls for the C4...if you need anything...........Hola'!

 

Went down to 25 squirters and up to 74 main jets, problem got a bit better. Going to try bigger jets, the bigger I go the better it seems to get.

To test if the vac secondarys are causing the problem, can I just un hook the rod that connects them to the diaphram? i.e. remove the e clip and let the vac rod just hang loose?

 

Although I am using a 600 Holley. I went down in squirter size and up in jet size...

 

what size squirter is in it now ? and what size did it have . and yes i think you can unhook it .

 

oh oops I see you went to 25s for squirters.

 

I just got a nice box from summit with secondary springs, pump cams and some other goodies. Hopefully I can finally get this fixed.

 

what happened?

 

Ok, changed jets up and down, no change. Changed secondary springs to brown and black, everything the same. If I adjust timing, if I advance, problem moves up higher in the rpm range, if I retard it comes down. I have 2 mallory unilite distributor's, both have the same effect. !@#!@$! Fuel supply is a new holley blue with regulator, guage checks right at 6 PSI.

If the car has no load it seems to rev and fall evenly. As soon as you mash the gas, engine gets to about 2400 rpm and sounds like its going to die, clears up a little and then does it more for about another 5-8 rpm, smooths out then does it again. If I part throttle, the response is quick, and moves right along.

Seems like it isn't carb related although I haven't tried putting another (smaller) carb on it, or technically the distributor either since I replaced it and it does the same thing. At this point my friend suggested it may be a loose rocker or 2 (they are pedestal mount, but I have not checked them since we installed motor and I have put 100 or so miles on it...) Tomorrow I plan on checking them (can't hurt)

Any other idea's? Could it be a carb accellerator pump issue? I have multiple cams, the factory green is on there now...

 

do you have the right firing order?

 

have you tried bigger squirter yet. I only say that because the holly book says a stumble is usually due to lack of fuel. i personally would break the bank open and buy a new 600 or 650 double pumper that has solved carb problems for me. or at least borrow one to see.no vacume secondary carb is gonna out perform a double pumper. I have been through this 10 times.