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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | Tomcoe's suggestion is the best. If you measure the outside diameter of the of the cylinder and say it's 4 1/2 inches, that would indicate a bore of probably 4". Now with the radius squared (2X2) times 3.14 you get 12.56 square inches of piston area. If your pump puts out a 1000psi then you have 12,560#'s or 6 tons of lifting power. It's a lot better if someone knows from experience because this way you have to know the pump pressure and cylinder specs.
Evan
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