OK, that's another vote for locked timing smile

I'm using a Jacobs "Boost-Master" (aka "Turbo-Timer") retard unit and rev limiter. It has two 0-15 degree retard knobs, originally intended to switch from one to the other with a pressure switch. In my application the second retard will be for nitrous and will be activated by throttle microswitch.

So I can dial out 15 degrees of timing at start; just have to remember to twirl the knob when hot. It starts fine when cold at 34.

Re: vac advance, with my 10.3:1 CR (iron heads, quench) I figure it will tolerate some advance at cruise. Idle vac is only 6-7" so definitely won't be activating the can at idle.

Carb is an old 2-corner 800 DP. I'm having discussions with Dom (Thumper) and he's going to make me a better carb. In the meantime I might as well play with this one. BTW he also favors locked timing with this cam and CR.

You and BradH are both recommending that I not run the PCV valve. Can you please tell me why? thanks.