Board index Flathead Power-Technical Questions, Answers, and Suggestions Shovels 80 & 81 heads

80 & 81 heads

Moderators: Curt!, Pa

Post Sat Sep 21, 2013 11:24 am

Posts: 111
Did HD leave the lower valve spring collars out of these heads? I have a set that are 1.375 from the head without collar to the upper collar. Or did they run a special low lower collar with less spring space ?

Post Mon Sep 23, 2013 8:58 am

Posts: 634
Location: Wisconsin, USA
They have lowers that sit directly on the head, no support from the guide. 80-81 motors always required spring spacing work when you installed any higher lift cam. Spring space with upper only at .375 seems extra tight, aftermarket valve a little short or thick at face?

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