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Useful Ordering Information<br />
inboard exhaust valves<br />
INT EX EX INT<br />
Determining Which <strong>Crower</strong> Shaft<br />
Rocker System Fits Your Needs<br />
If you’re not sure or don’t know which <strong>Crower</strong> Shaft<br />
Rocker System will fit your cylinder head, or the type/<br />
model of head you have and need help, follow these<br />
simple procedures:<br />
1. You’ll need to provide us with some critical information<br />
and dimensions.<br />
a. Cylinder head manufacturer<br />
b. Engine type<br />
c. Intake and exhaust valve distances from cylinder<br />
head centerline.<br />
d. Rocker stud spacing from cylinder head centerline.<br />
Here’s how you do it.<br />
Measure the distance from the outside diameter of the two<br />
inboard exhaust valves. Record the value. Subtract the diameter<br />
of the valve (Example: .341) from your recorded value and divide<br />
this measurement by 2. Now you'll know the distance from the<br />
cylinder head centerline to exhaust valve centerline.<br />
Now measure the distance from the outside of the intake valve<br />
to the outside diameter of the exhaust valve diameter. Subtract<br />
.341" from that to get the centerline distance from exhaust to<br />
intake valve.<br />
Note: .341" diameter is based on 11/32" intake and exhaust<br />
valves. Some cylinder heads have different size intake stems.<br />
Make sure you measure valve stem size before measuring valve<br />
centerline.<br />
2. Follow the same procedure for the studs.<br />
3. Supply us the dimensions and we’ll take it from there!<br />
head centerline<br />
exhaust valve<br />
centerline-to-intake<br />
valve centerline<br />
dimension<br />
exhaust<br />
valve<br />
centerline<br />
exhaust valve<br />
centerline-to-intake<br />
valve centerline<br />
dimension<br />
intake<br />
valve<br />
centerline<br />
Rocker Body Identification<br />
To order replacement rockers and insure correct fit you’ll need<br />
to provide your <strong>Crower</strong> technician with the following info.<br />
Rocker Bodies without I.D. numbers:<br />
• Rocker arm Ratio<br />
• Rocker arm Offset<br />
• Which valve the rocker actuates<br />
(intake or exhaust)<br />
• Which cylinder the rocker is<br />
mounted on (2,4,6,8–1,3,5,7, etc.)<br />
• Name/brand of cylinder head<br />
• Stand Number<br />
• Shaft Diameter<br />
Aluminum Stud<br />
Mount Rockers<br />
Rocker Bodies with I.D. numbers:<br />
• Rocker arm Body I.D. number<br />
• Rocker arm Ratio<br />
• Rocker arm Offset<br />
• Stand Number<br />
• Shaft Diameter<br />
Ratio and Offset<br />
Locations<br />
Stainless Stud<br />
Mount Rockers<br />
Aluminum Shaft<br />
Mount Rockers<br />
Stainless Shaft<br />
Mount Rockers<br />
For technical support call 619-661-6477 or visit www.crower.com<br />
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