Performance timing
AjJ/FormSe; I do whatever it takes I'm still running a pcv on one of the valve covers and a chrome push on breather on the other . Do need to get rid of the pcv valve and use another push on breather? Also i have a stock torque converter. Do you have a photo of the holes you drilled in the primary butter flys?
The 292/292 is a pretty big cam, and in a modest 318 even bigger. That means, with the Transfers sync'd, the timing will be modest, and the idle vacuum pretty low... which means the PCV will not be flowing much. But it is your principal Idle-air bypass. So leave in in there.
Don't forget that at WOT, there is no way for the PCV to keep up, so the breather part of the system will work in reverse, spewing crankcase vapors all over your valve cover; this is normal whenever the engine is under heavy load, not just at WOT. If you are not returning these vapors to the air-cleaner housing then you probably want to reroute them somewhere else.
If your carb has a 4-corner idle system, then you may be able to get away with cracking the secondaries, to supply the engine's craving for air. Then you won't or may not need, to drill the primaries. Some guys believe drilling the primaries is a bogus thing to do. Not me, I do whatever it takes, usually as cheaply as possible. I have never had success with introducing dry air into the secondaries; ie, cracking them. You can make it work, but it will not idle properly; try it for yourself if you like. IMO this is as bad or worse, than hooking the brake-booster to the #8 runner. If you don't like the idea of drilling holes; there is an adjustable PCV system on the market, that can be used to good effect. Say Goodbye to about $160 IIRC. The engine doesn't care where it gets the required air, so long as it exits into the airstream with the low-speed fuel,lol.
Sorry no pics. When you flip the carb upside down, you will see the transfer slots in the front sides of the throttle bores. And you will see the idle mixture ports close by, with the screw-tips slightly (or not) protruding into the bores. You just need to be in the general vicinity of those slots and ports, and not too close to the edge; that is all. If you manage to get them the same between the bores, it looks good on your resume.... that is all,lol.
As an aside; when I got this right, I was able to idle the engine down to 550rpm, in first gear, and that big 292/108 pulled my pig-Barracuda around on hard,flat, level ground. However, at 11.3Scr the pressure pulses were so strong that with a manual trans, the car would start to buck like a wild horse. I reduced the idle-timing to 5*( from 14*) , and that went away, as long as the rpm was above 550 in gear. But,lol, at this setting it would not climb the slightest hill with a starter gear of 3.55x2.66. So I got me a Commando-box with it's 3.09 low-gear for a TM improvement of 16%, and then I was happy, because this got me down to 4 mph. It would operate like that for as long as I needed it to.
