"The splayed-valve cylinder head has 240cc intake runners." The splayed-valve casting has a .240" minimum port wall thickness that permits extensive modifications by cylinder head specialist seeking even more airflow.
The intake valves are angled 16º to the deck surface and tilted (splayed) 4º. The exhaust valves are 11º, with a 4º tilt. This cylinder head has symmetrical intake and exhaust ports and can accommodate a 2.20" diameter intake valve and a 1.65" exhaust valve. Its nominal combustion chamber volume is 45cc, although the actual volume will depend on the seats and valves installed.
It is the same as cylinder head P/N 24502517 except as follows: No head bolt holes, dowel holes, intake bolt holes, valve seat machining, valve spring seat machining, pushrod holes, or rocker bar machining. This gives maximum deck surface and the end surfaces are machined. (The difference between the rough machined P/N 12480146 and the semi-machined P/N 12480147 is the valve guide and spark plug holes are machined on P/N 12480147.)
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