He also checked piston-to-valve clearance before fully assembling the engine. With the cam installed straight up, intake valve clearance was 0.160 inch. With the cam installed 6 degrees advanced, the intake clearance was 0.110 inch. With the cam installed 6 degrees retarded, the exhaust clearance was 0.087 inch. Hafliger said he does not like clearances less than 0.070 inch.