Timing dilemea...
 

Ok...its not a true dilemea...but I have way too much total vacuum...I have an adjustable vacuum can, and a proform HEI..the mechanical advance is 25 degrees in at 2700rpm..with the vac. im up to 65 degrees at 3000...thats with intial set at 8 degrees
Thats after I adjusted down the vacuum can..it was 80 degrees total timing...WTF..my 283 has pretty low comp. so it dose not ping..but im getting ready to put in a 10.2 to 1 355...so im trying to figure it out
thanks
jim

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67 lwb fleetside...first hotrod in 25 years...283..186 bowl ported heads..270h comp cam 600 1405...stealth intake..HEI..th350 with 2500 rpm stall..4:10 POSI
god I love to go fast

Go for a crane vac advance can,& limit the vac advance to about 10 degrees(approx .110 pull on the rod). I did mine by tack welding a small strip of sheet metal on the bracket. You can then run your initial 14-16 up,& total @ 34-36 with the can unhooked & plugged.I would plug the can to full man vac,then you should pull about 44 degrees under light throttle cruise. No fear,when you drop the loud peddle,you will be running on initial & mechanical advance only. For a street curve,try to use the springs that will give An "all in" @ 2800-3000 rpms on the mechanical advance. Good luck.....69 longhorn.

[This message has been edited by 69 longhorn (edited April 21, 2002).]