Conversion Charts
Temperature Fahrenheit to Centigrade Centigrade to Fahrenheit


Conversion
Formulas inches x 25.4 = mm cubic inches x 16.387 = cubic
centimeters 1 da (N•m) = 7.373 foot pounds cubic feet x 7.481 = gallons gram x .03527 = ounces psi x 6.895 = kilopascals (kPa) mph x 1.609 = kilometers/hour (km/h) horsepower (hp) x .746 = kilowatts
(kw) (degrees Fahrenheit 32°) x .555 =
degrees Celsius Surface feet/minute = 3.1416 x diameter x rpm Displacement

Machining
Cylinder Heads for Proper Intake Manifold Alignment After
machining the head at surface A, material should be machined from surface B for proper
intake manifold alignment. Note how the bolt holes in the intake manifold do not line up
after machining the head gasket surface A The amount of corrective machining required varies with the angle at which the head is made. Head angle is the variance from 90°. For instance, a head that has the head gasket and the intake manifold surface made at a right angle (90°) to each other would be classified as a 0° head. 0°
Head Angle (Big Block Ford & Oldsmobile) 5°
Head Angle 10° Head
Angle (Small Block Chevy and Ford) 15° Head Angle
(Chrysler, Y Block Ford) 20° Head Angle
(Oldsmobile 303, 324, 371 and 394) 25° Head Angle
(Cadillac, Dodge, Plymouth) 30° Amount Removed at "A" x 3.0 = Amount to be removed at "B". On some engines, it is necessary to remove stock from the intake manifold bottom if the heads have been surfaced. The amount required varies with the head angle. 0° Head
Angle (Big Block Ford) 10° Head Angle
(Small Block Chevy and Ford) 