Originally Posted by Diplomat360
'74 360 block here...checked the hole diameter and it looks to be around .300-.310, however several on-line sources reference a 0.275" diameter pin (Mancini Racing), and yet there is the following Mr. Gasket part which is 0.310".

Heck, this Pioneer Automotive set is a steal at $11 for 25 pcs!

So what the heck is the right/correct dimension?

I've never seen a wobbly dowel pin ever, so that 0.275" diameter seems not right.
I have a couple of the kits Mopar sells to finish out a new bare block. Freeze plugs, distributor bushing etc. The have two sets of dowel pins in them one set around .310 and some others closer to .275. Not sure where the small ones go.