TED, thanks for clarifying my suggetions and the guys have clearer understanding. Your word for word answer described the problems of the 4" sleeve/deck problem and furnace brazeing is unaailable here also, hence i,m not holding out for success with my 4" er, fingers x,d. Allways look forward to your clinical and precise explanations, best regards bill.

P.S, is it just me or site, when typing, some of the letters are missig in the words and have to be retyped??

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Its not you Bill. ts ben going on for some months now.

Mark

1956 Mercury M100
1955 Ford Fairlane Club Sedan
Delta, British Columbia

Yes, I did not have good luck with the eight thick walled sleeves and a 4" bore. Ran great for a couple of passes and then went to pumping water. A lesson learned the hard way, and that was with a solid filled block.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Just wondering out loud, could a solid copper (no coolant passages) head gasket have prevented that?

Y-Block bored to death.

Some Turbo-Nissan guys use steel plate sinked in top of the block. Supports the cylinders from doing that when they take 600hp from engine what weights about same as one the Y-Block cylinder head.


Hyvinkää, FI

Nope! Tried that.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Tim, although starting 4 " project some 15 yrs ago, ive just been at it on/off, covered up till next time. As i,ve seen ted and your results i hold no happiness in ts future, but will see i i can add it to the pile.

yyy

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

I wonder if you could us some high grade all thread rod for head studs that go all the way through and tie the upper and lower portion of the water jacket together.
Or maybe dowels in the upper an lower portion of the sleeve. Maybe the head bolt bosses would have enough meat up top. Not sure about the bottom.

Both will have challenges but may be possible.


Lawrenceville, GA

Is the block deck flexing as it is no longer tied to the lower part of the block?

A few years back I came across a set of diesel sleeves which were stainless steel and about 040" thick with a rolled lip at the top which is what held it in place.Perhaps with something like this the original bore can be left in place and machined to fit a slimmer steel sleeve.