Engine Related Helpful Data and Formulas

Cubic Inch Displacement = Bore x Bore x Stroke x (.7854 x # cylinders)*
* use the following: 8 cylinder = 6.2832
6 cylinder = 4.7124
4 cylinder = 3.1416
CC in Deck Clearance = Bore x Bore x 12.87 x Deck Clearance
CC in Head Gasket = Bore x Bore x 12.87 x Compressed Gasket Thickness
Net Combustion Chamber Volume = Combustion Chamber Volume Dome Volume + Deck Clearance
CC + Gasket CC
True Compression Ratio = (Cubic Inch Displacement x 16.39 / Number of Cylinders / Net
Combustion Chamber Volume) + 1
BoreStroke Ratio = Bore / Stroke
(Theoretically, the larger the Bore-Stroke ratio, the higher the engine
will RPM.)
Rod Ratio = Length of rod (Center to Center) / Stroke
Common rod ratio in drag racing is about 1.8, versus circle track 1.7)
Crankshaft Throw = Stroke / 2
Carburetor Size = Cubic Inch Displacement x Max RPM / 3456 x Volumetric Efficiency
Stock carburetors have a VE of 85%, Good reworked carbs
will have a VE of 98%Or Max RPM = Carb size x 3456 / VE/ CID
Horsepower based on ET HP = Weight / (ET / 5.825)3
Horsepower based on Trap Speed HP = (MPH / 234)3 x Weight
Intake Manifold Surface your intake when you surface your block or heads.
Intake Manifold
Block or Heads Side Bottom
0.005 0.006 0.009
0.01 0.012 0.017
0.015 0.018 0.025
0.02 0.025 0.034
0.025 0.031 0.043
0.03 0.037 0.052
Miles Per Hour = RPM x Tire Diameter / Final Gear Ratio / 336.31
OR = RPM x Tire Rollout / Final Gear Ratio / 1056
To set Chevrolet Valve Lash:
When the #1 cylinder valves do not move do not move as the crank
approaches TDC 0, the engine is in the #1 firing position. Move crank to Zero degrees.
Adjust Exhaust #8 #4 Intake #7 #2
Rotate Crank 180and Adjust Exhaust #3 #6 Intake #1 #8
Rotate Crank 180and Adjust Exhaust #5 #7 Intake #4 #3
Rotate Crank 180and Adjust Exhaust #2 #1 Intake #6 #5
Common Torque (FT-Lbs.):
Mains 70-80 Rods 50-65 Heads 65 Intake 30
Exhaust 20 Oil Pan 15 Cam 30 Carburetor 10
Damper 70 Flywheel 65 Clutch 30 Water Pump 30
Common Clearances:
Main Bearings 0.002-.0025
Crank End Play 0.002-.0025
Top Ring End Gap Stock 0.010 Race 0.020
Second Ring End Gap Stock 0.012 Race 0.015
Rod Bearings 0.002-.003
Steel Rod Side Play 0.008-.010
Aluminum Rod Side Play 0.050-.070
Deck Clearance Minimum Stock .008 Race 0.004
Piston to Wall 0.005-.008
Piston To Valve Intake 0.080 Exhaust 0.100
Oil Pan to Pick up 3/8 No more or no less!

 

Always check Manufacturers specifications and with your Machine Shop!