[Bob B.]

Originally Posted by factorystock

Question for Bob B. Is there a way to identify the heavy duty valve options on the 305 V6 externally? Assuming there is no build sheet. This chart is for the pickup, not the larger trucks with bigger 351 401 478 jobs.

I have wondered that myself. I have a 1967 'Pleasure Trucks' brochure and it shows the 305E heavy duty valve and rotator option, but it is not listed in the regular 1967 light duty brochure. I can tell you for certain the 351E had the heavy duty valves, seats, and rotators standard as I saw my engine had those features when I rebuilt it, and it had never been apart. The 1967 Data Book shows heavy duty valves and rotators for the 305E engine as R.P.O. K71, a $24.00 option for all CM light trucks. And of course K71 would show on the SPID label and build sheet. But your question is what abouth the engine itself? I would assume there would be some code stamped into the block denoting K71 where the engine serial number is (like Chevy did for years with those 3 letter codes) but I don't know for sure. Engines had an information card attached to them from the engine plant for quick identification on the assembly line as you can see in some of the plant photos that have been posted here in the past. Those cards however were thrown away before the truck rolled off the line. That having been said, if the truck doesn't have a SPID or build sheet the surest way to find out if it has K71 is to pull off a valve cover. It's easy to see the valve rotators, they sit between the bottom of the valve spring and the head.