[DeTomaso] Valve Stem Seals for ferrea f5040 valve / triple spring

[JDeRyke at aol.com]

In a message dated 6/2/09 9:56:34 AM, rolf_poulsen at hotmail.com writes:

> I need to buy some valve stem seals. The valve stem diameter is 11/32 in. 
> the outside diameter of the old seals is about 0.630 in. But what about 
> the valve guide diameter? does this matter?  there are two different sizes at 
> summit: 0.500 in. and 0.531 in.
> 
The good aftermarket valvestem seals are all-teflon (Perfect Circle is one 
brand I use) and snap over the ends of cut-down guides. The cutter can be 
bought at Crane or Isky Cams (or others) and uses a 3/8" hand-held drill to 
shave the diameter of the guide tops down. Takes about 2 minutes per guide- 
either stock cast iron or silicon-bronze aftermarket guides. 

Its a good idea to replace all stock neoprene seals. Stock 351-C "seals" 
really aren't seals. They're umbrellas that grip the upper valve stem and ride 
up & down with it, acting as a sort of shower-shield. Not very effective 
IMHO. Over time bathed in hot oil, neoprene seals will harden & crack; pieces 
then fall in into the oil pan and work their way into the oil pump where the 
pieces jam the pump. This debris is what breaks stock Ford distributor 
drive gear pins and the oil pump driveshafts. Adding cheaper 
partial-neoprene-partial-teflon seals only repeats the cycle over time; use all-teflon seals 
and avoid the possibility. Good luck- J Deryke




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