PCV hose size: 6AN vs 8AN?

[Race Bred]

What are your thoughts on hose size for the pcv lines on the top of the head? They will be merged into a single line, then it will run to the Greddy catch can (while on topic, dose anyone know of the thread size for the catch can (old square style)? I assume it is bsp?) I currently have 3/8" line on there off of a N/A pcv hard line...

3/8"= .375" id
6AN= .34" id
8AN= .44" id

I guess the question is: is there any benefit for a larger line in regards to the pcv system? My gut feeling says go with the 6AN.

Any insight is appreciated,
Eric

 

[lagged]

i dont think it makes a difference. any size as big or bigger than the PCV ports on top of the valve covers should be fine.