Exhaust vs. Intake Valves

ocwd · Post by **ocwd** » Tue Aug 19, 2008 9:54 am

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

Post by **wesk** » Tue Aug 19, 2008 11:44 am

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.

ocwd · Post by **ocwd** » Tue Aug 19, 2008 1:45 pm

Perfect. I'll get out the caliper and do some measuring. I was going to have to do that any way.

ocwd · Post by **ocwd** » Wed Aug 20, 2008 8:04 am

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?

Post by **wesk** » Wed Aug 20, 2008 10:21 am

Could be. Or it may just be a quality control issue.