TIMING CHART
PART NUMBER:
251526
GRIND NUMBER:
525-B
ENGINE INFO:
CHEVY II 1962-71 4 CYLINDER 153 CU.IN.
APPLICATION:
SPECIAL REMARKS:
SOLID
PRODUCT USE:
OVAL
RPM RANGE: 2500-6500
Valve lift is calculated with zero lash and rocker ratio of 1.75
INTAKE TIMING
DURATION:
278
deg.
OPEN:
30
BEFORE TDC
CLOSE:
68
AFTER BDC
CAM LIFT:
.30"
VALVE LIFT:
.525"
VALVE LASH:
.025
HOT
.027
COLD
EXHAUST TIMING
DURATION:
278
deg.
OPEN:
68
BEFORE BDC
CLOSE:
30
AFTER TDC
CAM LIFT:
.30"
VALVE LIFT:
.525"
VALVE LASH:
.025
HOT
.027
COLD
LOBE CENTER:
109
deg.
OVERLAP:
60
deg.
CAM ADVANCE:
0
deg.
THE ABOVE TIMING IS CHECKED AT
.020
(OPEN) LIFTER RISE
.020
(CLOSE)
The following timing is taken at .050" lifter rise and gives a more accurate determination of camshaft position.
INTAKE
DURATION:
238
deg.
OPEN:
10
BEFORE TDC
CLOSE:
48
AFTER BDC
EXHAUST
DURATION:
238
deg.
OPEN:
48
BEFORE BDC
CLOSE:
10
AFTER TDC
RECOMMENDED ISKY CAM KIT PARTS AND SETUP INFORMATION
LIFTERS:
202-H (8)
LIFTER TYPE:
SOLID
SPRING:
4205 (8)
TYPE:
DUAL
DIA.:
1.240"
RATE:
250
lbs per inch
INSTALLED HEIGHT:
1.687"
SEAT PRESSURE:
115
lbs
OPEN PRESSURE:
240
lbs
COIL BIND:
.960"
SPRING SHIMS:
# 2
STEEL RETAINERS:
707-ST (8)
TITANIUM RETAINERS:
PUSHRODS:
233-HG+125 (8)
TYPE:
NON-ADJUSTABLE
LENGTH:
9.812"
DIA.:
16-May
ROCKER ARMS:
204-96 (8)
TYPE:
ROLLER
RATIO:
1.72
VALVE LOCKS:
VL-32 (16)
VALVE LOCKS:
VL-32 (16)
REV KIT:
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© 2002 Isky Racing Cams. All rights reserved.
