05-04-2014, 09:01 AM
Todd it sounds like you have some sticky valves probably from sitting, heres an interesting thread from WOG about Marvel mystery oil I found interesting and maybe worth a try http://www.wanderlodgeownersgroup.com/fo...hp?t=11655
Love old school

1976 Newell 8.3 cummins allison 6spd
1977 Newell 8.3 cummins allison 6spd