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I'm pretty sure they are 3/8ths as well. The main bolts on the headers are 5/16ths and I know the ones on the ends are a size bigger.
 

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I think they are 5/16-18 on the head side, and 5/16-24 on the manifold side. The ones on the ends are not bigger, just corroded from all the water that has been sloshing around in them over the years.
 

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all the threads IN the heads are 5/16ths coarse , while the "end" studs have 5/16ths fine where the "nuts" go . the important thing on these is that they do go into the water "jacket" and will dump water when/IF removed . use of the convex thick washers as factory did allows the bolts/nuts to stay tight even when they heat/cool . I re- tighten them while hot/warm . careful not to snap one .... the lenght , you want about 3/4 ths inch protrusion . you can use a bottoming tap to clean/ check thread depth , or a notch filed bolt .
 
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