[SPAM] OS 1.40 header

[AtwoodDon at aol.com]

Ed, I observed the same thing about the OS header flange not matching the  
exhaust port so I ground it out to match the engine but did not observe any  
improvement in performance.  I have switched to the Macs header because of  the 
O-ring wear issue.  I did like the isolation of the engine from the  header by 
allowing it to pivot on the rings but you always know it is time to  change 
the o-rings when you start getting some blow by.  
 
There was some short comment about a better way to support the OS type  
header and increase the o-ring life (I think it was here on the discussion  group) 
some time back but I can't remember who it was.
 
Don
 
Don AtwoodIn a message dated 10/7/2005 7:17:39 P.M. Pacific Daylight Time,  
ed_alt at hotmail.com writes:

Just wondering what the opinions are re. the best header for the OS  1.40.  
I've got the OS version and it's a bit of a nuisance to deal with  the O-ring 
going bad. Also, it really looks like it would result in improved  gas flow 
(more power) if the inlet for the "matched" header was the same size  and shape 
as the exhaust port.  I'm tempted to grind it down to get that  match right.  
Has anyone done this and does it help?
Thanks
 
Ed 



 
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