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Here are the HEI advance specs GMC JiM posted awhile back.
When I installed an H.E.I unit in my '71 GMC ( 402 engine) ; I had a distributor rebuild shop set the advance curves as per the GM factory manual. The specs are :- 0 degrees @ 930 RPM; 2 @ 1260 RPM; 16 @ 2400 RPM and 30 @ 4400 RPM. Vacuum advance specs are 0 degrees @ 8" hg and 20 degrees @ 17" h.g. Initial ignition timing is 8 degrees advance @ 600 RPM ( idle speed).
... Above specs are from GM 1971 Chevrolet Truck Service Manual.
... Another GM reference is the 'GM/AC/Delco Tune-up Specs Manual # SD-100. These specs call for a 10-13 degree centrifugal advance @ 2000 RPM and a total advance ( vacuum & centrifugal ) of 28 to 35 @ 2000 RPM...... When I installed my unit about 10 years ago; I used an adjustable timing lite and set the timing to 35 degrees @ 2000.........No problems and I am well satisfied with the engine performance.............
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BILL
Torrance Calif 90504
Member DUF Club
Member Old Farts Club
72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts
tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion.
" If I knew I was going to live this long I would have taken better care of myself "
Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER....
Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,
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