I have 71Z with F54 block and triple Mikunis. I was thinking of putting a catch can on it. Any opinions? Thank you.

Is your engine spitting a lot of oil from the lower breather tube?

If you don't have a PCV valve, the lower breather tube has to go somewhere.

 

I've got one (a little strainer with a clear plastic bowl) between the breather tube and the PCV valve. It picks up about a tablespoon of oil per year. Don't want oil gunking up my PCV valve. Also have some clear fuel-resistant hoses going from the vents on the SU bowls to a catch can (vented plastic Sriracha bottle), so I'll know if they overflow. So far so good, but I can see how they might on a steep hill. So far they overflowed about one teaspoon in two years. It evaporated in the catch can. My floats are intentionally set a little high. Also have the coolant overflow from the recirculating tank going to a vented Sriracha bottle. So far nothing in it. Haven't gone up the mountain in summer since installing it, though.

 

Catch cans required for race tracks as far as I know.

What do you want to catch?

My car is not on the road yet.