Originally Posted by rtbates
IF your 1GM has been run in the past with a bad exhaust elbow you might have the same problem my 1GM had. And that was a hole in the head at the pushrod galley
through to the exhaust port. seems a PO ran it with a bad elbow long enough for sea water to sit in the exhaust area after shutdown. Do this long enough and a hole is created..
Well I pulled it appart this morning. After removing the valve cover I poured a little oil in the top over the valves. Nothing came out...
Next i poured a little more over the entire area and all of a sudden oil started running out the exhaust port. Nice golden oil!
So i narrowed it down to the point of the exhaust pushrod area. Next I pulled the rocker arm, and push rods.
I poured oil in the pushrod holes and out it came.
So I have now pulled the head and yes I can see a 1mm little hole between the pushrod area and the exhaust port. There isnt huge pressure there.
This all makes sense since the exhaust elbow inner sleve was broken. When I scraped out the carbon I scraped away the last little remaining wall.
Its important to note that the exhaust mixer looked brand new on the outside. I would recomend everyone who has this engine to check often by pulling it off.
OK so now what.
Before I leave it at a shop.....
1 Can this even be fixed? Its a cast iron head. Welded? Plugged? Successfull or very temporary?
2 Can you buy refurbished heads?
3 Buy a new one? Leave it to be assembled at the shop with some of the old parts
and new replacement parts
where needed. Lapp the valves etc..
in Vancouver charges double of that in the Seatle area.......Bring my old one down to a comercial vendor there and have him put it together and bring it home. Any suggestions?
Thanks for all the help so far..