Closeup of a 3 Angle Valve Seat- Blue seat angle is 45 degrees, top angle is 30, bottom angle is 60 degrees. The grinding stone in use is also the 60. The blue dye on the surface of the head has been applied to scribe the opening in the head gasket, and then the cylinder head chamber has been ground out to this point, to make room for slight piston protrusion from the block deck surface.

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