I've fulfilled my GB mission but as I occasionally use this forum- I thought I might offer a GB for anyone considering a Wagner PCV valve- they are expensive but this helped a lot. This link has all the info.
http://67-72chevytrucks.com/vboard/showthread.php?p=8683878#post8683878
https://www.chevelles.com/forums/13...er-df-17-pcv-few-days-ago-2.html#post11245542
http://67-72chevytrucks.com/vboard/showthread.php?p=8683878#post8683878
https://www.chevelles.com/forums/13...er-df-17-pcv-few-days-ago-2.html#post11245542