Working on a freshly overhauled 1969 440.
Isky solid cam .557 lift, 296* duration, 110cl. Lash is set at .006
Timing 10* w/ 30* advanced.
Edelbrock CH8 with twin 1406 carbs. New and still factory settings.
We are at about 7000'.
Car does not seem to be running too rich with is odd.
1st issue. At idle the vacuum is very erratic at around 6 in. Needle is bouncing.
The step up pistons that hold the metering rods are bouncing hard with the vacuum. They are hitting their little covers so hard it is making a loud chattering sound.
Does not seem to be and can't find any vacuum leaks. If I choke off a carb it wants to stall the motor.
2nd issue. Using a laser temp gum while at idle. Most header tubes at the flange are running around 240* number 3 is running around 380* and numbers 4 and 6 are round 300*.
Thoughts?
