The LP may or may not work on your K321. Exhaust valve may hit the head due to the lack of clearance for valve.....bigger exhaust valve.
I like the head that has the sparkplug over the exhaust valve. The area between the valves on this head is not restrictive. The area on the LP head has some restrictiion. You do loose a little compression with the head that has sparkplug over the exhaust valve. It's not enough to notice in my book.
Power output depends on the condiation of the motor.
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