DeTomaso Mailing List: March 2001, Message #84

Hello Art

I had this very same problem when I put Manley 1.94 and 1.60 in a late model 5.0 head.  I called numerous cam and spring manufactures for help and 99% said it was machining problems.  Then I called Crower Cams. 

They make both retainers and keepers that vary the spring height.  You will need to mount a stock retainer and measure the height to the head.  Then you need to measure the spring height at required preload (if you don't have this, you can use the installed spring heigth spec).  They can probably set you up from here.  It might require the use of spring cups if you are way out.  

P.S. I run titanium retainers and 10 degree keepers.  The valves are very heavy, and I have seen numerous ones pushed through the retainers when I ran a Stock Car.  At the very least, run "machined" keepers (they are harder, won't change shape).

Kenny

>>> "ART STEPHENS" <ART_STEPHENS@msn.com> 03/01/01 07:09PM >>>
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     The open chamber 4v heads for my 72 Pantera are at the
 machine shop in need of new valve spring retainers because
 I have changed from stock valves with multi goove keepers to
 Manley Stainless Steel Severe Duty valves with single groove
 keepers.  The machinist says there would be no tension on the
 springs if installed as is.  I asked the machinist if he could get 
 me the proper retainers to make this set up work.  He said his
 supplier didn't have such a retainer and that I would need to
 locate the proper retainers or shorter valves.  I am wondering
 if all he has to do is use additional shims or is there a proper
 retainer and lock to make this all work.  I am planning to use 
 my original springs.  I called Manley and asked the for the
 correct retainers, they said they needed to know all of the 
 inside diameters of the spring and damper?  The machinist said
 he could get that info on his computer, but his computer was
 down.  If someone can tell me how to make this darn thing work,
 it would be appreciated.
 Thanks,
         Art


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