I have a couple of Canadian Pontiac 261’s both of which have 3836848 heads with steam holes that I am certain left the factory that way from GM Canada in Oshawa. I have also read several times that the usual practice for using this head on a 261 in the U.S. is to simply use a head gasket as a template for drilling. The steam holes in both my heads are at a 12 degree angle toward the manifold side which has me wondering if the holes on a U.S. 261 are drilled perpendicular to face or tilted and if anyone who drilled them straight had difficulty intersecting the water cavity on the one very close to a head bolt?
Here’s what I’m talking about and thanks for insight from anyone who knows what’s up with this.
