If you are looking at $62 each for cylinders you might want to look into getting yours sleeved with stainless liners. Cost might be a little more than that...but then you won't have to worry about rust again. Just something to consider.
Tad
1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....
| 
