Conversion Charts

Temperature
Conversion

Fahrenheit to Centigrade
subtract 32, multiply by 5,
then, divide by 9.

Centigrade to Fahrenheit
multiply by 9, divide by 5,
then add 32.

Fahrenheit Celsius
(F) (C)
32 0
40 4
140 60
150 65
160 70
170 75
212 100
275 135
300 150
325 165
350 175
375 190
400 205
425 220
450 230
475 245
500 260

 

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Conversion Formulas

inches x 25.4 = mm
mm x .03937 = inches

cubic inches x 16.387 = cubic centimeters
cubic centimeters x .061 = cubic inches
liters x 61.025 = cubic inches

1 da (N•m) = 7.373 foot pounds
foot pounds x 12 = inch pounds
foot pounds x 1.355 = newton meters (N•m)
foot pounds x .1383 = kilograms/meter (Kg/m)

cubic feet x 7.481 = gallons
liter x .2642 = gallons
gallon x 3.785 = liters

gram x .03527 = ounces
gram x .0022 = pounds
Kg x 2.1 = pounds

psi x 6.895 = kilopascals (kPa)
kilopascals (kPa) x .145 = psi
psi x .069 = bars
bars x 14.5 = psi

mph x 1.609 = kilometers/hour (km/h)

horsepower (hp) x .746 = kilowatts (kw)
kilowatts (kw) x 1.3405 = horsepower (hp)

(degrees Fahrenheit -32) x .555 = degrees Celsius
(degrees Celsius x 1.8) + 32 = degrees Fahrenheit

Surface feet/minute = 3.1416 x diameter x rpm

Displacement
stroke x (1/2 bore)2 x 3.1416 x (# of cylinders)
= displacement or:
8 cylinder: 6.283 x stroke x bore x bore = displacement
6 cylinder: 4.712 x stroke x bore x bore = displacement
4 cylinder: 3.1416 x stroke x bore x bore = 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.

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           0      Head Angle (Big Block Ford & Oldsmobile)
                   Amount Removed at "A" x 1.0 = Amount to be removed at "B".

           5      Head Angle
                   Amount Removed at "A" x 1.1 = Amount to be removed at "B".

           10   Head Angle (Small Block Chevy and Ford)
                    Amount Removed at "A" x 1.2 = Amount to be removed at "B".

           15  Head Angle (Chrysler, Y Block Ford)
                  Amount Removed at "A" x 1.4 = Amount to be removed at "B".

           20  Head Angle (Oldsmobile 303, 324, 371 and 394)
                  Amount Removed at "A" x 1.7 = Amount to be removed at "B".

           25  Head Angle (Cadillac, Dodge, Plymouth)
                  Amount Removed at "A" x 2.0 = Amount to be removed at "B".

           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)
                  Amount Removed at "A" x 1.4 = Amount to be removed at "C".

           10  Head Angle (Small Block Chevy and Ford)
                  Amount Removed at "A" x 1.7 = Amount to be removed at "C".

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