I rebuilt a 350 TBI out of a late 80's medium duty truck...4 bolt main, 1 piece rear seal...out of an 89 or so, I think. Does anyone have any idea what size valves are in these heads? I don't think they're anything too big. Obviously, I should have checked when they were off... Thanks!

 

what's the casting number on the heads? check that with mortec.com and it might tell you

 

Should be 193 castings, 1.94"/1.5" valves; swirl-port garbage heads. It doesn't matter what the valve size in that type of head is, they don't flow.