Its worth a call to Davis Diesel, usually the magnums (asp) are copies
ofOS I don't know about the 52/61 if the bolt pattern is the same spacing
as an other engine he has heads for KB OS etc he may be able to fit you
one up.If he thinks so he will ask to have the glow head sent up If you
want to keep the engine in service an other head is not much I would
guess less than$10 that would give him time to check and see without
a time frame problem