Once again....using un-named, un-documented sources, as gospel, to try and emphasize your point.......what is/was the source of the underlined references....or just "cherry picked" out or thin air....without any reference to anything relevant. And no mention of anything about the need for vacuum advance for those that don't want or need it......just your biased opinion........and for those of us (me) that NEVER use manifold vacuum as a tuning component. PM to discuss....if you want......The man vac port will be the lower one on the carb body. Nothing to do with the brand of carb either, Holley or Carter [ Carter is better ]. A little known fact is that the engine can need as much as 50* of idle timing with big cams, & anywhere in between. The simplest/best way to do this is by using vac adv connected to man vac adv [ MVA ].
The 264 cam with 9:1 CR is probably going to need 25-30* of idle timing for best idle/highest vacuum/best tip-in performance.
You can test this easily in 5 min: engine warmed up, VA disconnected, idling, in gear if auto, turn dist SLOWLY CCW. Keep going until you get the highest rpm. Now see what the timing is.
Report back with results.
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Well there ya have it. What "holy grail" did this come from out of curiosity (I can't stop it)? I am always willing to give it a go if it can help.
That "chatter" sounds like detonation - take a couple of degrees out of the timing and see if it goes away.Well there ya have it. What "holy grail" did this come from out of curiosity (I can't stop it)? I am always willing to give it a go if it can help.
UPDATE: I put a Holley 600 and after a little throttle linkage adjustment she running like a champ. Been playing with the timing here are there but settled in at about 13 degrees BTDC. Doesn't kick back on the starter when starting, doesn't diesel when shutting down and fires right up with a bump of the key. I have noticed there is a "chatter" when under load when I put my foot into it. When cruising or light acceleration everything is sooth and sounds great.... But when I put my foot down it gives me a chatter sound. Never did that before so another fun little mystery. Maybe bump the timing around until it stops? Or may this be a valve adjustment issue?