gem wrote:Head number 217 (last 3 digits) is a 350 1.94 intake without the swirl port. Most often found on marine applications. You are looking for engine code '8' engines in Camaro and base model Corvette. They have the 1.94 intake without the swirl. I have never seen a factory truck engine in those years without the swirl.
The 217 head doesn't have the 45* center intake bolts like all the other TBI heads.
blue88 wrote:Any idea if it is worth it to replace the stock "193" TBI heads with say a set of 487/993 heads from the early 70's without any other mods except opening the center intake holes to align with the old heads? Any real value here.. and would this be a direct replacement without modifying the computer.. etc.
gem wrote:The 217 head doesn't have the 45* center intake bolts like all the other TBI heads.
That's odd as the head I have here in my shop has the center intake bolt holes on the different angle and I can't recall ever seeing a 217 or its sister casting the 083 with a different intake bolt configuration.
I'm in Canada so it might be a Canadian thing we have been known to have different GM castings before.