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Cam Specifications |
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Modified Cam (509 Grind) |
OEM Cam |
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Intake |
Exhaust |
Intake |
Exhaust |
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Opens |
13o BTDC |
57o BBDC |
8° ATDC |
19° BBDC |
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Closes |
57o ABDC |
13o ATDC |
18° ABDC |
9° BTDC |
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Duration @ 0.020” |
273o |
273o |
224° |
230° |
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Duration @ 0.050” |
249o |
249o |
190° |
190° |
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Overlap @ 0.050” |
26° |
Zero |
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Lobe Centerline Angle |
112° |
108.5° |
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Lobe Taper (in) |
Flat |
Flat |
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Lobe Lift (in) |
0.424 |
0.302 |
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Base Circle Diameter (in) |
0.875 |
1.000 |
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Valve Specifications |
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Modified |
Original |
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Intake |
Exhaust |
Intake |
Exhaust |
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Head Diameter (in) |
1.650 |
1.500” |
1.500 |
1.328” |
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Stem Diameter (in) |
5/16 |
5/16 |
5/16 |
5/16 |
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Valve Lift (in) |
0.410 |
0.410 |
0.286” |
0.288” |
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Curtain Area (in2) |
2.18 |
1.97 |
1.34 |
1.18 |
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Lash (in) |
0.014 |
0.014 |
0.016 |
0.014 |
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Valve Spring Specifications |
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Modified |
Original |
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Intake |
Exhaust |
Intake |
Exhaust |
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Spring Shape |
Beehive |
Beehive |
Straight |
Straight |
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Number of Coils |
6 |
6 |
7 |
7 |
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Top Coil Diameter (in) |
0.950 |
0.950 |
1.145 |
1.145 |
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Bottom Coil Diameter (in) |
1.175 |
1.175 |
1.145 |
1.145 |
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Wire Diameter (in) |
0.160 |
0.160 |
0.160 |
0.160 |
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Free Length (in) |
2.010 |
2.010 |
1.969 |
1.969 |
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Bind Height (in) |
0.95 |
0.95 |
1.180 |
1.180 |
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Closed Spring Pressure (lb) |
131 lb @ 1.531” |
139 lb @ 1.501” |
51 lb @ 1.672” |
51 lb @ 1.672” |
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Open Spring Pressure (lb) |
238 lb @ 1.121” |
246 lb @ 1.091” |
107 lb @ 1.312” |
107 lb @ 1.312” |
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Spring Rate (lb/in) |
260 |
260 |
155 |
155 |
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Lifter Specifications |
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Modified |
Original |
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Intake |
Exhaust |
Intake |
Exhaust |
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Head Diameter (in) |
1.230 |
1.230 |
1.000 |
1.000 |
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Head Diameter Swept by Lobe (in) |
1.128 |
1.128 |
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Body Diameter (in) |
11/16 |
11/16 |
3/4 |
3/4 |
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Overall Length (in) |
2.57 |
2.57 |
1.89 |
1.89 |
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Crown Radius (in) |
80 |
80 |
Flat |
Flat |