What should the timing be set at for a '72 350 with HEI, Performer manifold, and Holly 600 w/mechanical secondaries?
What should the total advance be and when should it be full?
Wm
Timing is everything
Nov 13, 2004
6 Replies
Compression ratio? Octane rating on gas? GW
Geoff Welsh did truly imply:
Mild, around 8.1 Factory stock on everything but the above mentioned items.
Good ol' standard 87 octane pump gas.
Wm
With compression that low, you can probably get away with 8-10 btdc at idle and 34-36 btdc at 2000 rpm.
That's about what I run, but I have 10.2:1 and need 95 (R+M)/2 or better. GW
Geoff Welsh did truly imply:
Very nice, thank you. I am going to install a new vaccuum advance pot on there before twisting it around.
Wm
Vacuum advance comes on immediately:
At idle and slightly above. Centrifugal advance takes over after about 1800 to 200 and should be full at about 2500 RPM.
Refinish King
My 71 455 HO w/ 8.4:1 and 73 455 w/ 8.1:1 compression both specify 12 degrees advance at 700 RPM.
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