Racingjunk Forums - View Single Post - Valve Lash and Cam Timing

08-15-2010, 04:16 AM

#9

demented

Member

JUNIOR BUILDER

Join Date: Jun 2004

Location: lake luzerne n.y.

Posts: 87

Quote:

Originally Posted by fla1976

This is how I adjust valves. The website has excellent info on valve adjustments but there is too much info to list here.

http://www.centuryperformance.com/ad...h-spg-149.html

Valve Adjustment Procedure - The Quick and Accurate Way:
First, view this little chart below for Small and Big Block Chevy Engines that I made and see if you can understand it. There is more of an explanation below the chart. For other engines you will use the firing order that matches your engine to create a similar chart. This chart is based upon "opposite" cylinders of your firing order. (see below)
Intake Valve Adjustment: ENGINE OFF!
■with #1 cylinder Intake Valve at full valve lift .... Adjust #6 Intake Valve
■with #8 cylinder Intake Valve at full valve lift .... Adjust #5 Intake Valve
■with #4 cylinder Intake Valve at full valve lift .... Adjust #7 Intake Valve
■with #3 cylinder Intake Valve at full valve lift .... Adjust #2 Intake Valve
■with #6 cylinder Intake Valve at full valve lift .... Adjust #1 Intake Valve
■with #5 cylinder Intake Valve at full valve lift .... Adjust #8 Intake Valve
■with #7 cylinder Intake Valve at full valve lift .... Adjust #4 Intake Valve
■with #2 cylinder Intake Valve at full valve lift .... Adjust #3 Intake Valve
Exhaust Valve Adjustment: ENGINE OFF!
You will notice that this is the same procedure and sequence as the intake valves listed above. Only now you are adjusting ONLY the exhaust valves the same way.
■with #1 cylinder Exhaust Valve at full valve lift .... Adjust #6 Exhaust Valve
■with #8 cylinder Exhaust Valve at full valve lift .... Adjust #5 Exhaust Valve
■with #4 cylinder Exhaust Valve at full valve lift .... Adjust #7 Exhaust Valve
■with #3 cylinder Exhaust Valve at full valve lift .... Adjust #2 Exhaust Valve
■with #6 cylinder Exhaust Valve at full valve lift .... Adjust #1 Exhaust Valve
■with #5 cylinder Exhaust Valve at full valve lift .... Adjust #8 Exhaust Valve
■with #7 cylinder Exhaust Valve at full valve lift .... Adjust #4 Exhaust Valve
■with #2 cylinder Exhaust Valve at full valve lift .... Adjust #3 Exhaust Valve

Yes but this info needs to be adjusted for altered cams, 4-7 swap cams or 4-7-,2-3 swap cams.

The easiest way I have been taught to adjust valves is from reher morrison. If you take one cylinder at a time, when the exhaust valve begins to open you adjust the intake valve, Rotate the motor and when the intake valve begins to close adjust the exhaust valve.
I also found that when I set the lash cold i need to go back around once the motor warms up and adjust them again because it changes significantly. I always check them now when the motor is hot.

Reply