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Ive got std heads on my pan are they physically taller or larger then stock panhead heads? or to put it another way do the fins come out farther and is the rocker box then higher than stock? Thanks
 

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There are several different STD castings made. Some have much larger fin surfaces and others are designed to look more like OEM heads. Regardless of which type of casting you have, the rocker box height should be the same as OEM.

-Craig
 

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STD first came out with a replacement Shovel casting. They then modified the shovel casting to accept Pancovers and internals keeping the shovel intake and exhaust flanges.
These castings do not look at all like true panheads.
 
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