That is not a 3306 engine. The D334 came out in the mid to late sixties as far as I could find out (maybe even earlier like the rest of its family D330, D333 and D336). 638 cu inches so the same size as a 3306 but older technology but Bob is correct in that it does have twin overhead cams
Would the overhead cams be gear driven or use a timing belt. Thanks for the replies.
A little hard to read but here's a product bulletin on the net....https://www.ebay.com/itm/401707263316?chn=ps&mkevt=1&mkcid=28&srsltid=AfmBOoosK_q4Zsvx2BqQswvut_YwzDvl5oyQbn28TSg66bbdaqhUUJ_Bw18
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