John Deere A

[Jlee2792]

I have a 48 A and plan on milling the head and gasket matching how far can I comfortably go and what kind of compression and horsepower can I expect I have .90 aluminum pistons and that's it

 

[toot]

Some will say not. I say it helps. Mill .150 off, match port head to manifold. Clean up burrs and imperfections in the intake runner as well as intake valve bowls. Any little thing helps.