I have setup my Timing on my 383 Engine
Initial timing at Idle is 12 Degrees
Without vacuum hose fitted between carb and distr. Timing is set to 35 Degrees at 3500 rpm
and with vacuum hose fitted the Timing is 52 Degrees at 3500 rpm.
My problem:
If I slowly increase the rpm from Idle and up When I reach 4000 rpm the engine start to go rough and when I increase even more the engine start to bang in the exhaust system. (If I flash the engine hard from Idle up to 5500 rpm I don´t have any problem)
but if I do the same without the vacuum hose fitted between the carb and the distb. I doesn´t have the problem to go slowly from Idle and up to 5500 rpm then the engine goes great.
my distributor is a orginal 1969 383 with electronic ignition, I don´t find that I have any adjustment in the vacuum clock on my distributor.
I know that the vacuum adv. is only for fuel save and to burn the fuel better in crusing speed
What to do??