I am working with a 1972 454, 8.5:1 comp, heads just reworked, draw down tested to 22 in. New cam (factory LS5) Hyd. Cam installed to dead 0. Ignition timing should be at 8deg. BTDC but will only run above 12deg. (15 in. Vac. At 12 deg.) Runs better at 16 deg. BTDC (17 in. Vac. At 16 deg BTDC) runs best at 22 deg BTDC @ about 18.5 in. Vac. But at these settings I am having a major problem adjusting the carb. Also the engine will start but has a hard time getting up to proper idle speed, will start at about 425 RPM and is hesitant to get up to 750 RPM. If I advance the cam will it not bring down the ignition timing, (1 deg. Cam advance, 2 deg ignition retard) any sugestions would be helpful.
have the same problem?
Wednesday, July 22nd, 2015 AT 4:33 PM