hot cam specs
.050"  219.1 / 229.3 deg

.100" 187.7/ 197.0 deg

.200" 135.8/ 143.1 deg

.050 valve timing
Intake opens .3 degress BTDC
Intake closes 38.8 degrees ABDC
Exhaust opens 49.1 deg BBDC
Exhaust closes .2 def ATDC

112.3 deg lob centerline

108.7 deg Intake centerline 

(per DR HP)
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Camshaft, Rod Length, Boost and Altitude Correction to Compression

Your engine summary is as follows: Bore 4.0 inches, stroke 3.48 inches, rod c-c length 5.7 inches, with a static compression ratio of 11.4 :1. Your camshaft specifications call for an inlet valve closing of 38.8 degrees ABDC (after bottom dead center).

Your chamber volume is 68.91 cc's. With this camshaft your dynamic, or effective stroke is 3.20 inches. Your dynamic compression ratio is 10.45 :1 corrected for cam timing, altitude, and rod length. Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 223.82 PSI. Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and 0 PSI is 10.45 :1.

Knowledge is power.
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Inlet Valve Speed of Sound (MACH) Index
Your bore size is 4 inches with a stroke of 3.48 inches and has 1 inlet valves with a diameter of 1.94 inches. Running a valve lift of .525 inches at 6500 RPM, the inlet valve mach index is 0.567 . The mach index for maximum volumetric efficiency is .6 . Beyond .6 the volumetric efficiency falls off. As the mach index rises beyond .6 the volumetric efficiency can be increased by later inlet valve closings (60 to 90 degrees ABDC).
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Camshaft, Rod Length, Boost and Altitude Correction to Compression

Your engine summary is as follows: Bore 4.0 inches, stroke 3.48 inches, rod c-c length 5.7 inches, with a static compression ratio of 10.4 :1. Your camshaft specifications call for an inlet valve closing of 38.8 degrees ABDC (after bottom dead center).

Your chamber volume is 76.24 cc's. With this camshaft your dynamic, or effective stroke is 3.20 inches. Your dynamic compression ratio is 9.53 :1 corrected for cam timing, altitude, and rod length. Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 199.09 PSI. Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and 0 PSI is 9.53 :1.
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how to calc inlet valve max index:
temp1 = piston / 2;
temp2 = temp1 * temp1;
temp3 = temp2 * 3.1416;
temp4 = valve / 2;
temp5 = temp4 * temp4;
temp6 = temp5 * 3.1416;
temp15 = temp6 * numvalv;
temp7 = temp3 / temp15;
temp8 = rpm * stroke;
temp9 = temp8 / 12;
temp10 = (lift * 1) / (valve * 1);
temp11 = temp10 * 1.5;
temp12 = temp11 * 34793;
temp13 = (temp9 * 1) / (temp12 * 1);
temp14 = (temp7 * 1) * (temp13 * 1);
result1 = roundOff(temp14, 3);
result2 = result1 / 1000;
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