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450 Valve Cover Gasket Half Moons

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Hello there again forumgoers,

What is the reason for the half moons on a 450 valve cover gasket?

Cam removal is vertical. The gear is pressed on. The timing marks dont require it. Theres not a previous model that Im aware of.

Why dont they just use a flat, normal gasket without half moons? 

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24 minutes ago, SellYour4Stroke said:

Hello there again forumgoers,

What is the reason for the half moons on a 450 valve cover gasket?

Cam removal is vertical. The gear is pressed on. The timing marks dont require it. Theres not a previous model that Im aware of.

Why dont they just use a flat, normal gasket without half moons? 

Listen boy you trying to make us think or something like that or trying to reinvent the wheel or something. 

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1 of 2 reasons: Cosmetics, or a burst point if there's a huge spike in oil pressure and everything else is clogged.

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13 hours ago, GHILL28 said:

1 of 2 reasons: Cosmetics, or a burst point if there's a huge spike in oil pressure and everything else is clogged.

The half moons are not sensitive to system oil pressure in any way.  Crankcase pressure, yes, oil pressure, no.  If they blow out, the first place to look is for a pinched breather hose.

It has to do with nothing more complicated than how the cam and bearing bores are cut (from the left side to the right).  The cutouts are the same size as the bearings behind the sprocket.

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