HAL Experimental DOHC

On display is a rare HAL DOHC exploded view. Harry "HAL" Leo Hosterman started developing overhead cam conversion heads in 1921 and by the late 1920s to early 1930s he started developing the DOHC heads. He casted his own block, connecting rods, cast aluminum oil pan, and 5-main bearing crankshaft. 
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• Block - HAL 4-cylinder
• Head - HAL
• Cam Design - Dual Overhead Cam
• Valve Design - Standard
• Production Date - late 1920s - early 1930s