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Cam Specs

CAM NUMBER
VALVE LIFT
VALVE DURATION AT .050"
LOBE CENTERS
DESCRIPTION AND APPLICATION
INTAKE OPEN/CLOSE
EXHAUST OPEN/CLOSE
RUNNING CLEARANCE

258-x2
.502"
.502"
12.75mm
12.75mm
268°
268°
108°
108°
Road-race. Must use modified pistons and
springs. Mid-range and top-end power.
26° BTDC
62° ABDC
62° BBDC
26° ATDC
.005"
.007"

258-x5
420"
420"
10.7mm
10.7mm
264°
264°
108°
108°
OK with stock pistons. Spring kit
recommended. Improves mid-range power
in an otherwise stock motor. Check clearances.
24° BTDC
60° ABDC
60° BBDC
24° ATDC
.005"
.007"

258-x3
.495"
.475"
12.9mm
12.77mm
300°
300°
107°
107°
Must use racing pistons and springs. Road-
race performance mid-range and top-end
43° BTDC
77° ABDC
77° BBDC
43° ATDC
.005"
.007"

258-x1
.580"
14.73mm
283°
104.5°
Race only - 1000 motors. Fully modified engine.

251-x18
This is a C06 cam.
.576"
.520"
14.6mm
13.2mm
300°
300°
107°
107°
Full race cam. Top-end. Modify Everything.
TDC lift in = .254"
ex = .215"
43° BTC
73° ABC
77° BBC
43° ATC
.008"
.010"

Stock
.401"
.401"
10.2mm
10.2mm
245°
247°
107.5°
107.5°
Stock 750 and 920 for your reference.
15° BTDC
50° ABDC
51° BBDC
16° ATDC

For the time being reckon on $1350 a pair plus $550 for spring sets; except for the 258x5.

Last Modified: Thursday, 07th March, 2024, 01:41pm PST