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Shaving down the head (Read 20 times)
memetr
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Re: Shaving down the head
Reply #30 - 06/21/07 at 13:07:06  
Guys there is a specific formula used to raise compression by head milling. This is a cheaoer method than new piston. Harley sportster guys use this method all the time.
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Re: Shaving down the head
Reply #31 - 06/21/07 at 14:15:13  
difference is the HDs are push rod motors not ohc engines
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Re: Shaving down the head
Reply #32 - 06/21/07 at 16:46:33  
The only way that I can think of to advance the timing gear to compensate for shaving the head would be a offset key between the cam and gear. Don't know if there is enough room to fit a offset key in there or not but I've seen them used for other applications. Just a thought.
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Re: Shaving down the head
Reply #33 - 06/21/07 at 17:40:58  

Graphic by Greg

I calculated that for .07" chain stretch it would retard the timing by 7°.

I beleave Justin's right, shaving the head will make the chain seem longer.  So the same calculation applies.
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Re: Shaving down the head
Reply #34 - 06/21/07 at 18:28:23  
We shall see what happens soon.
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Re: Shaving down the head
Reply #35 - 06/21/07 at 21:58:08  
Or redrill the cam gear 83 degrees (or whatever it takes to get the cam back in time with the crank) from where it is now. Seems like I remember Crane Cam gears with 3 sets of holes and marks for Std, adv and retard depending on what kind of performance chages yo were looking for.
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