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.. any problem using shorter valves in an FE head if rocker shaft stands are ..

June 14 2017 at 7:31 PM
winr1  (Login winr1)
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.. shortened as well ??

Other than coil bind or such with hi lift ??

Looking at .030 to .050 shorter at the most



Ricky.


    
This message has been edited by winr1 on Jun 14, 2017 7:34 PM


 
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Tom P
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Re: .. any problem using shorter valves in an FE head if rocker shaft stands are ..

June 14 2017, 9:29 PM 

That little bit won't hurt but you can't go too extreme since the rocker stands and valves are on different angles. Shorter valves move farther from the shafts.

 
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kelly
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what about lash caps?

June 14 2017, 11:53 PM 

maybe save the hassle of shortening stands and sweating the pushrod length?

 
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TorinoBP88
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2x on lash caps

June 15 2017, 12:26 PM 

Change the spring keepers and caps for ones compatible with lash caps, then at the caps and the rockers fit like stock.

Maybe add a touch of grease when you install the, so you don't drop them down into the engine when you pull off the rockers. And plug all holes with towels when installing them!!!



    
This message has been edited by TorinoBP88 on Jun 15, 2017 12:28 PM


 
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winr1
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Thanks guys :-) ... N/M

June 15 2017, 12:35 PM 

Ricky.



 
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TorinoBP88
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summit:

June 15 2017, 1:05 PM 

Call Summit about keepers and spring retainers, they need to be lower so the lash caps dont unlock them, dropping the valve into the engine:

https://www.summitracing.com/search?SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=3%2F8%22%20lash%20caps

COMP Cams 622-16 - COMP Cams Valve Lash Caps

Click here for more information about COMP Cams 622-16 - COMP Cams Valve Lash Caps
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Lash Caps, Steel, 3/8 in. Valve Stem, .080 in. Thick, Set of 16

(3)

Part Number: CCA-622-16 More Detail...

Estimated Ship Date: Today

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This message has been edited by TorinoBP88 on Jun 15, 2017 1:07 PM


 
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winr1
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Thanks for link Torino :-) ... another question if I may ..

June 15 2017, 3:56 PM 

I have a set of heads the PO may have ground the stem tips a bit much


If ones valve tips were ground past the hardness ..

And one added lash caps, would they be fine or wear the valve tip ??




Ricky.

 
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kelly
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I think the caps take the beating to protect the tips

June 16 2017, 12:23 AM 

I have a set of C6AE-U heads that were on my 428 with 972 springs, maybe 747 retainers and whatever the
10 degree lock number is for 3/8 valves, they have a relief around top for lash caps. Sounded like something nice
to use, but if the caps get loose, problematic.
After pulling the rockers off these heads (with a few thousand miles since all new and fully rebuilt with stock valves of common stock),
at least some of the valve tips felt noticeably rough to the touch and I wondered what to do about it, exactly.
Had factory adjustable rockers and steel stands with spacers. I can see how maybe solid cam valvetrains might be a little harder on
low grade valves, or maybe the condition of the rocker faces were at fault. Maybe the spacers were a problem?
I decided I wanted roller rockers on everything to help avoid any weird wear as a result of stock rockers or just inferior valves.
but
I need to run a non-adjustable mild hydraulic in a 390 with stock non adjustable valve covers. If I can get end stands under there I will,
but I do expect to use some rebuilt stock assemblies I have. Now you have me considering using lash caps if I can make things work through the
pedestals and pushrods correctly. and find a way to keep loose caps from falling into an engine. In a week or two I will get these heads
modified for better valve seals, and a spring swap, get the tips ground and figure out the rocker assembly.
I wouldnt jump into them lightly.
I bet its easier to use them on short valves than it is to use them on a stock setup.

 
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winr1
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Thanks Kelly :-) .... N/M

June 16 2017, 11:04 AM 

Ricky.

 
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Cammerfe
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Lash caps don't....

June 17 2017, 5:37 PM 

move on the valve tip. No movement means no wear.

KS

 
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winr1
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Thanks KS :-) ... N/M

June 17 2017, 6:30 PM 

Ricky.


 
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