Originally posted by S19243H
its not a truck lt1s10 the motor is out off a 74 blazer stuffed in a 83 camaro if i set the timing at 8 btdc THE IDLE AT 1000 THE GAUGE READS 10 INCHES i have a light with a dial i set it at 8 and look at zero on the tab or look at 8 on the tab and set the light at zero
that sounds right, but set the light where you want it 8 to 12 degrees is a good start. with the light on 10 when you look at your tab that should be on 0. if you have your light on 0 then the tab would be on 10, after that if you jack a little more timing into it the vac. should go up a little. if it dont then thats all the vac. you have. the higher the timing the more vac. but you cant go but so high. you say the motor runs good, other than it cuts off when you put it in gear. i still belive you have a leak. is the vac. hand study or jumping all over the place while its idling at 900 rpm.