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01-27-2023, 03:57 PM | #1 |
Senior Member
Join Date: May 2010
Location: Paris, Tennessee
Posts: 182
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Valve stem length
For you guys who use non adjustable lifters, what is your method to determine how much to grind off the valve stem to arrive at the correct valve lash. Pictures if you have them, measurement tools if you use them. TIA
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01-27-2023, 09:19 PM | #2 |
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Join Date: May 2010
Location: Mill Valley,Ca.
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Re: Valve stem length
There is a real cool tool, I don't have a picture.
With cam and lifters in place, valve seats cut, You insert this tool into the place where the valve sits, lock it and this transfers to the stem grind. Some one will step in to clarify, I hope. I would be doing it carefully and slowly, by trial. Karl |
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01-27-2023, 10:41 PM | #3 |
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Location: Masterton, New Zealand
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Re: Valve stem length
My way sounds like it takes a while, but once you get into it, it really doesn't. Whatever valve I'm working on, I'll position it in place with the tappet on the heel of the cam. Install the valve and see what the existing tappet clearance is....If I have an existing clearance of say, .008" and I desire .014, simple arithmetic tells me I need to take off .006, so I'll take off .005 and recheck...I like to 'creep up' and double check the final setting....If you cannot insert your thinnest feel gauge [.0015?] in that initial test, and, again, you are seeking a .014 clearance, then grind the .014 off and recheck, again, just easing up on the amount to come off for the final coupla thou. The time it has taken me to type this nonsense, I coulda done a couple!!
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01-27-2023, 10:42 PM | #4 |
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Location: Wa.
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Re: Valve stem length
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01-28-2023, 12:41 AM | #5 |
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Join Date: Aug 2010
Location: McMinnville, TN
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Re: Valve stem length
I own the tool mentioned above and used it yesterday. I can post a photo when I get to work Monday. It makes it where I can do a non adjustable valve job quicker than that of using adjustable lifters. It is a gauge that sits in place of the valve and guide and gives you a measurement. Then I have a Sioux valve stem gauge that gives me that measurement. Subtract one from the other and add in the lash you want and on the grinder it’s easy peezy.
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01-28-2023, 09:29 AM | #6 |
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Location: Paris, Tennessee
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Re: Valve stem length
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01-28-2023, 09:50 AM | #7 |
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Location: Chester Vt
Posts: 8,860
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Re: Valve stem length
Pete's method is what I use. However, Syem length is important when using adjustable lifters, The adj lifters were designed to aide the valve adjustment when grinding the valves. The locking mechanism of the lifter doesn't have much travel and whrn using on a HI lift cam usually doesn't hold. Back in the day they had lifter screws with thicker heads to make up the difference. This is deffinately the problem with the L-100 cam, or other cams with more than .3550" lift. So I use the chevy valve which id .060"??? Longer than the Ford valve.
Gramps |
01-28-2023, 10:02 AM | #8 |
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Location: Central Ohio
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Re: Valve stem length
Hey Pete and Mike: Explain the procedure to weld up the stem tips of the valves to add more material and also what welding process and type of rod you use.
This is the other 1/2 of the equation, when the valves are too short (think high-lift cam). |
01-28-2023, 11:59 AM | #9 |
Senior Member
Join Date: May 2010
Location: Paris, Tennessee
Posts: 182
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Re: Valve stem length
Anyone use lash caps?
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01-28-2023, 01:27 PM | #10 |
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Location: imperial,mo
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Re: Valve stem length
Here is the tool that I use, anyone with a lathe and basic machinist / fabrication skills could duplicate it easy enough.
Tom |
01-28-2023, 06:40 PM | #11 | |
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Location: Wa.
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Re: Valve stem length
Quote:
After you have done a few engines, it is faster to do the job this way than do a set of adjustables. We use titanium valves in most of our engines now and they come plenty long so no welding needed. They can be welded though. |
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01-28-2023, 08:47 PM | #12 |
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Join Date: Aug 2010
Location: McMinnville, TN
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Re: Valve stem length
I can’t comment as I use stock cams usually NOS and sometimes chevy valves and haven’t had to lengthen any, plus unlike most of you in only building 3-5 engines a year
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