26
For Big Twins
VT No. Year
Cam
Degrees
At .053
Lift
TDC
Travel to Free
For 1987-99 Evolution
140 Ev
Open
Closes
Total
TDC
Coil Bind
Travel
Inlet
30
42
.450
.222
.480
.530
Exhaust
55
27
.450
.177
.480
.530
Viper (146 Ev) Cam delivers excellent performance throughout the RPM range. Bolt in street cam with first open & close
ramps.
495
20°
36°
.495
.236
44°
16°
.240
For
Identification
check these
applications:
1987-99
Evolution
Sifton Stock Cams are replica type. Also avail-
able with matching pinion gear.
Cam
Cam Kit OEM
Fits
—
—
24582-88 1987-90 Ev
Hydraulic-Bolt-in. Broad power range for streetable performance. Wor ks well with stock compression
ratio and stock exhaust. No spring change required. Basic RPM idle-4000. Does not have multi-
index gear. Cam lift at TDC: Int: .094" Exh.: .093".* Replaces EV-13.
Hydraulic-Bolt-in Street performance for heavier bikes that are slightly modified. Can be used with stock
compression or increased up 9.5:1. Complements exhaust and intake modifications. No spring change
required. Basic RPM 1500-4500. Replaces EV-3. Cam lift at TDC: Int: .101" Exh.: .114".*
Hydraulic-Bolt-in designed for speed or touring. Works well with engine modifications. Works
best with 9.5:1 compression ratio. Early Evo’s that do not have notched pistons must be
checked for valve to piston clearance. Basic RPM 2000-5000. Replaces EV-35. Cam lift at
TDC: Int: .110" Exh.: .127".*
Hydraulic-Performance Cam. Mid-range & upper RPM improvement. Works best with 10:1 comp. ratio. Works well
with performance carb & exhaust. Excellent for modified touring bikes. May require valve spring change. Check all
clearances. Basic RPM 2500-5500. Replaces EV-5. Cam lift at TDC: Int: .125" Exh.: .129".*
Hydraulic-Bolt-in for speed or touring. Works well with engine modifications. Works best with 9.5:1 comp.
ratio. Does not require valve spring change. Early Evo’s that do not have notched pistons must be checked
for valve to piston clearance. Basic RPM 2000-5000. Cam lift at TDC: Int: .110" Exh.: .127".*
Hydraulic-Performance Cam. Mid-range and upper RPM improvement. Works best with 10:1 compression
ratio and performance carb and exhaust. Excellent for modified touring bikes. May require valve spring
change. Check all clearances. Basic RPM 2500-5500. Cam lift at TDC: Int: .125" Exh.: .129".*
Hydraulic-Performance Cam. Mid-range and upper RPM power. Works best with 10.5:1 com-
pression ratio. Can be used with stock heads. Clearancing and valve spring change required.
Excellent stroker cam. Basic RPM 3000-6000. Cam lift at TDC: Int: .140" Exh.: .122".*
Hydraulic-Performance Cam. Designed for larger cubic inch and decreased compression ratios.
Street-strip type performance 88cu. in., 10.5:1 compression ratio and up. Heads must be clearanced
and have performance valve springs installed. Basic RPM depends on the combination, approximately
3000-6500. Cam lift at TDC: Int: .143" Exh.: .143".*
Hydraulic-Performance Cam is designed for stock cubic inch Evo’s that have increased compression
and/or performance head work. Must have the heads clearanced for .581" lift.Will produce strong low- and
mid-range power with appropriate intake, heads and exhaust. Up to 88cu. in. Basic RPM depends on the
combination, approximately 1800-5200 RPM.
Hydraulic-Performance Cam designed for higher compression and/or increased cubic inch Evo’s that have perfor-
mance heads. Clearancing and valve spring change required for .600" lift. Produces strong mid-range power in a
stock cubic inch bike. Basic RPM depends on the combination, between 2500-5800 RPM.
Hydraulic-Performance Cam. Street-strip type performance for large cubic inch bikes with performance
heads. Produces broad power range. Clearancing and valve spring change required for .600" lift. Basic
RPM 2800-6000.
1984-99 Evo Cams
Duration .053" Gross Valve Lift
Open/Close
VT No. Int. Exh. Int. Exh. Series
Type and Application
Grind#
a
.490
a
Hydraulic
12/34 41/15
Fire Ball
300-2B
a
.490
a
Hydraulic
16/40 43/19
Fire Ball
310-2
a
.490
a
Hydraulic
19/43 48/24
Fire Ball
316-2B
a
.490
a
Hydraulic
24/48 57/25
Fire Ball
326-2
a
.490
a
Hydraulic
19/43 48/24
Hi-Roller
H286-2B
a
.500
a
Hydraulic
24/48 57/25
Hi-Roller
H296-2
a
.510
a
Hydraulic
28/54 69/23
Hi-Roller
H306-2
a
.550
a
Hydraulic
23/63 68/28
Hi-Roller
H310-2
CAMS for Big Inch Motors (Head Machining Required)
10-8169 240 248 .581 .581 Hydraulic
17/43 45/23
Hi-Roller
H290-2
10-8170 254 260 .600 .600 Hydraulic
24/50 55/25
Hi-Roller
H304-2
10-8171 260 266 .600 .600 Hydraulic
26/54 65/21
Hi-Roller
H314-2
Note:
a
Gross Valve lift for Evo with 1.6 Rocker Arm Ratio.
To convert cam lift to valve lift, multiply the cam lift figure by the Rocker Arm Ratio: Evo-1.6
Sifton
Cams
