[email protected] (Dave Williams)
fordnatics  17 Nov 1997
- -> comp cam pro magnums are rebuildable.  The body is made of 4130
  -> chromoly, and lighter and stiffer than aluminum arms.  the arms
  -> fulcrom and tip are rebuildable.
- The main roller is held in with snap rings per usual practice.  The tip 
  roller, instead of being pressed or snap ringed, is riveted and staked in 
  place.  It would require drilling to remove. 
- Not only that, Comp does some lousy work when staking the tips; somehow 
  their tooling likes to shave off a big burr which you have to break off with 
  a pick. 
- I've used two sets of these things so far.  I like the idea that they'll fit 
  under most stock valve covers without major hassle, but I'm not as impressed 
  with their construction as some people.  And they're expensive, too.  For a 
  $75 premium over aluminum rockers, I at least expect not to have to pick 
  burrs off. 

[email protected] (Dave Williams)
fordnatics  09 Jun 2000
- -> I believe the Pro Magnums are supposed to be a bit stronger and more
  -> resistant to flex than the aluminum ones.
- Perhaps, but I've had several sets of 1.6 ratio Pro Magnums go through here, 
  and every one of 'em has had the same problem - the roller side is too long, 
  putting the roller way off on the outboard side of the valve tip.  This 
  means you need dramatically longer pushrods to get the wiped area moved back 
  to the center of the valve tip.  These pushrods -anywhere from 1/4 to 1/2 
  inch longer - jack rockers up so they look like a line of cats with their 
  asses all up in the air. 
- This, in turn, means the timing of the oil holes in the cup end of the 
  rocker and the end of the pushrod are off - the odd rocker angle leaves the 
  oil hole uncovered longer, flooding the valve covers with oil.  This means 
  you really need to run lifter gallery oil restrictors, which means 
  separating the engine from the trans, pulling the flywheel, and screwing 
  them in - after guessing at what size drill bits you need to run through the 
  restrictors, which are designed for solid lifters.  If you don't make the 
  holes big enough the hydraulic lifters will collapse.  If they're too big, 
  you're still pumping too much oil.   
- If I can ever get TRX' new engine on the run stand I'll be able to 
  experiment with the oil hole size easily.  Since Rudy was nice enough to 
  send me a ring to replace the one I broke when reassembling the engine, 
  maybe we'll find out soon...  whatever I wind up with might apply only to my 
  engine, but at least it'd be a starting point for someone else. 

[email protected] (Dave Williams)
fordnatics  01 Jan 2001
- -> rocker is on there. The problem with rail guided rockers is that they
  -> don't handle side loads very good, not that they're supposed to go
  -> sideways in the first place but still...
- What side loads?  The ball is lower than the pushrod cup and valve pad; the 
  rockers are self centering, at least under normal conditioned. 
- I have a set of the non-rail rockers.  They're a little wider than the rail 
  type, but I don't really see enough difference between them to get excited 
  about. 
- -> Also, I believe the valve length is slightly different on the rail
  -> guided ones as well but its been a while since I've messed with them,
- Valve length, pushrod length, Ford was all over the place with the Windsors.  
  Clevelands too, in fact.  I had a whole box full of weird Ford valves that I 
  gave to a local rebuilder buddy; he occasionally needs one or two for 
  replacements when doing a set of heads.  He thinks I did him a favor, but it 
  was actually part of my Master Plan of moving a bunch of junk from my shop 
  to his; I just bum parts back if I need them.