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Exhaust vs. Intake Valves
Posted: Tue Aug 19, 2008 9:54 am
by ocwd
So what is the difference between exhaust and intake valves? When I pulled my engine apart I noticed a distinct difference in the two types of valves. I have a box of NOS valves in my garage that look like the used intake valves from my engine. But the valves in the attached link also look just like my intake valves and are listed as exhaust valves. Also, the parts TM has different part numbers for exhaust and intake valves.
http://www.armysurpluswarehouse.com/pro ... 3-3101.cfm
Posted: Tue Aug 19, 2008 11:44 am
by wesk
Item 11 is an exhaust valve and 12 is an intake valve.
Material: Intake Chrome nickle 3140 Exhaust Stellite or Eatonlite
Length: Intake 5 3/4" Exhaust 5 13/16"
Face diameter: Intake 1 17/32" Exhaust 1 15/32"
Also note face of exhaust is slightly convex.
Valves
Posted: Tue Aug 19, 2008 1:45 pm
by ocwd
Perfect. I'll get out the caliper and do some measuring. I was going to have to do that any way.
Valves
Posted: Wed Aug 20, 2008 8:04 am
by ocwd
Wes,
I measured my valves. I have 4 that are exhaust (l=5 13/16" d=1 15/32") but I also have one intake that appears to be the same length as the exhaust with the larger head diam. The intake valve is l=5 13/16" and d=1 17/32. I doubt that this extra 1/16" is measurement error as I checked it a couple of times. Could this longer intake valve be for a different vehicle?
Posted: Wed Aug 20, 2008 10:21 am
by wesk
Could be. Or it may just be a quality control issue.