302 DZ help - exhaust blocked or restricted?
Hey Gang, I have been wrestling for several years to get this DZ motor to run right. I have been through the carb, curved the distributor, set valves, re-located vacuum advance, and followed most everybody's suggestions. However, I can't understand why I have such a fat-rich idle, and a dying car at hot idle. Above 2500 RPM, it runs just fine, but burns gas like crazy. Oil does not seem to be contaminated.
FYI...the exhaust sat on the garage floor for 3-4 years during a re-do, and when I initially started the car after the engine was done and the exhaust put back on, mouse blew out the tail pipes. This car has great and even compression, clean carb with proper jets and PV, solid ignition, and runs to 6500 RPM without a miss. Idle is set at 950, 14-16 degrees advance initial, and I get 10.5 inches of vacuum. Drive it for 15-20 minutes, and it won't idle, temp is 180-190. Could it be that the mufflers are just internally rusted as the car sits for many weeks/months between drive intervals? Mufflers are 20 years old at least. Help me Obe-Wans!
69 Z-28-Glacier Blue, X-77