Vacum and timing advance on new motor
04-14-2005, 01:23 PM
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Car: 1984 Z28 camaro HO Gun metal Gray
Engine: 305,L69 H.O. rebuilt
Transmission: 700R4
Vacum and timing advance on new motor
Hi guys I have a new motor to set my timing on. It has a new crane cam it use to be the comp cam 2040 I am wondering what the timing would be right for this motor. I tried 4 and 6 degrees advance and didn not make a big differance. Although I have not driven the car down the road yet. (no plates no insurance...NO problem). I have lost the spec sheet on the cam (go Figure) and do not remember what it suggested the advance shoud be. I know there are some guys who know there stuff about cams in here so please let me know. Also what shoulds I be pulling for vacum in my motor and what makes it go up and down if I need more or less vacum... if I ever need to have less....dont think so? Please help, thanks
04-14-2005, 03:57 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Assuming this is still a CC system, start at 6 degrees base and adjust to taste after you've got plates & insurance, and can test it on the street.
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