Topic change - Holley Tuning

[sigtauenus]

Is there a problem with fuel boiling on a high rise intake?

[tarafied1]

no, I had a 12.5:1 compression and a big valve overlap cam. For some reason when I shut it off, it would boil the gas out of the carb from heat in the intake manifold. I had a lot of advance in the timing too so it was a bear to restart. Anyway, when I sold the short block (many years ago), I kept the carb and those plates. The carb is long gone, but I think I still have the plates in a box.

[apollard]

You are better off running the PCV to the carb spacer, as then the crankcase gasses get distributed to all cylinders instead of just the ones in one plane (and generally, just the back ones in that plane). There are lots of cars running them to the manifold, though. Only ones I've seen with a probelm from it had lots of blowby - which should not be a problem for you.

[Mach1Rider]

You can run the pvc tube to intake runner without a problem.
As far as the fuel boiling, It may not effect your carb.
The best reason to use the spacer in this case is power output will be increased with it.
Also you will notice a much better drivablity with the spacer in place.
The carbs retune will only be resetting the idle mixture screws for smoothest idle performance.

On a side note, IIRC the screw plug just below the sec vac pot is a pvc port in the carbs base plate.
I used this port on a 600 a few years back.

[sigtauenus]

I'll check to see if I have a port in the base plate.  Otherwise I plan to just get the Boss 302 style 3/8" spacer with PCV port and use that.