Measurement Specification

Engines may be encountered with oversize tappets (all eight) and/or an oversized camshaft. Oversize tappets will be identified by a stamping .254 OT'' on the machined pad below the rocker arm rail and above the No.1 exhaust port. Oversize camshaft will be identified by a stamping .38O/C'' on the cover rail above the No. 4 exhaust port and by stamping .38 O/S'' on the distributor drive end of the camshaft.

Camshaft Journal Diameter	- Note: Standard: No. 1, 1.7613-1.7623 inches; No. 2, 1.7712-1.7721 inches; No.3, 1.7810-1.7820 inches; No. 4, 1.7909-1.7919 inches; No. 5,1.8007-1.8017inches. Oversize: No. 1, 1.7763-1.7773 inches; No. 2,1.7861-1.7871 inches; No.3, 1.7960-1.7969 inches; No. 4, 1.8058-1.8068 inches; No. 5, 1.8156-1.8166 inches.
Camshaft Bearing Inside Diameter	- Note: Standard bore diameter: No. 1, 1.7636-1.7646 inches; No. 2,1.7735-1.7745 inches; No. 3, 1.7833-1.7843 inches; No. 4, 1.7932-1.7941inches; No. 5, 1.8030-1.8040 inches. Oversize bore diameter: No. 1,1.7986-1.7996 inches; No. 2,1.7884-1.7894 inches; No. 3, 1.7983-1.7993inches; No. 4 1.8081-1.8091 inches; No. 5, 1.8179-1.8189 inches.
Camshaft Bearing Clearance	.0008-.0028 Inch (in)
Camshaft End Play	0.0078 Inch (in)