Early Hemi valve length

5.225 is what I believe to be the stock valve length.
Can anyone tell me if the valvetrain geometry would be negatively affected by using 4.910 length exhaust valves with stock length intake valves?

Thank you

 

I don't see how the geometry couldn't be screwed up. Hemis are worse than most that way.

 

What engine are you needing info on? There were no stock valves at 5.225 length. That is a HotHeads "race" length.

 

5.225 is the length of the old smaller valves I pulled out of my '55 331 heads. I'm looking at replacing the intake with 2.080, 3x8 stem, 5.225 O/L, .225 tip. I found some exhaust valves that I liked, only the length was 4.910.

I looked at the HotHeads valves, but they have 11/32 stem and I don't want to have the change my guides.

Can you tell me the stock valve length? Also, would 5.225 work if the were the same in both intake and exhaust?

 

How about a lash cap to make up the differance.

 

A 5.225 valve is too long. The stock valves should be approximately 5.050 in length. Any that I have measured have been in that range. When adding that kind of length, the rocker arm is going to be right on the edge of the stem, instead of the center where it belongs. That leads to excessive side loading of the stem and guides. The correct length valves in .375 diameter stem are available. (I dont stock them, but can get them.) I am sure that Gary (QEC) has, or can get them also.
Unless you need a different length stem because of cam lift or rocker ratio, there is no need to use a GM valve.

 

I really don't want to use those if possible.



The 2.080 valves I mentioned were Ferrea F1636 340 Mopar.
I've found some 2.020, 3/8, 5.050. 225

 

5.225 sounds too long...are the valves you removed marked? How about a pic?

As Tom notes, long valves are not a 'drop-in' and can cause problems if used as is. We have installed long valves and tall springs in the Chrysler heads but in order to maintain correct contact to the rocker tip the rocker assemblies required alot of work...

.

 

I wont be where I can access the valves for awhile , but the springs were red which I'm pretty sure wasn't stock for '55. I'd like to use stock rockers without any additional "engineering".

 

Does anybody know the stock tip length?

 

Can anyone tell me what the valve stem height sould be ,after grinding the valves? Have seen a castle type sleeve, to place on head with valve in. If the valve stuck above the tool,you ground stem down,if it was below the castle notch.Replace valve.This is a `55 331 hemi.

 

as noted above the length is critical. you say you don't want to change the guides now. well you will be doing it soon after it is running due to the side load. do it right the first time. its a lot cheaper than doing it twice.