Im under the asumtion that it must be an oil less as i can find no where to either check or add oil.Ive looked all over it and i cant find the word oilless or even any lubrication ports.It doesent sound as if its running as hard as it should but i supose it wouldnt if theres blow by?

1942 1/2ton 1951 1/2 ton 1960 biscayne sedan 1968 ihc scout 1972 #### 3/4 ton