If it was in a car or 1/2 ton pickup I would say you would never have a problem. These step vans pull real hard on an engine. I would use an additive or put on a later model head unless you just run it till it wallers out the seats & than put in hardened seats or use a later model head. 1971 or later. If you need body parts for that grumman I know a good place to get them. Post it if you are interested. I repaired & sold step vans for 35 years. smile


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum