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By pintoplumber - 10 Years Ago
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I thought I'd start a new thread on this, for those that don't get Y BLOCK MAGAZINE. This is an early 239 looking at cylinder #4. The water passage is at about 2 o'clock. The black magic marker circle is where the water passage is located in newer blocks. To use a newer head on an early block, you need to drill a hole in the block so it lines up with the newer heads. This must be done at #4 and #8.
Be careful when drilling so as not to break off a drill bit in the block.
There's very little coverage with the head gasket at this new water passage location. The newer blocks have a triangular casting at that point. I took the block to a welder and had him weld some triangular gussets for me staying below the deck surface.
I then filled in the area with epoxy and sanded flush with the deck surface.
My 239 is bored +.125 and has a 312 crank in it. I put G heads on it so it flows a little better. Hopefully I'll have time to change the intake from my 354 to a 573 this winter.
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By NoShortcuts - 10 Years Ago
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pintoplumber (12/11/2014)
My 239 is bored +.125 and has a 312 crank in it. I put G heads on it so it flows a little better. Hopefully I'll have time to change the intake from my 354 to a 573 this winter.
Hmmmm... the 239 came with a 3.50 bore... + .125 over bore... equals 3.625... with a 312 crank... About 283 cubic inches, Dennis?
The .125 overbore sounds extreme, but.. the '54 Merc 256 was a 3.620 bore and used the same crank as the Ford 239. I assume that the block castings were related, although the casting numbers were different.
WoW! Talk about boring and stroking an engine! 1/8 inch over bore, almost an 11/32 stroke increase!
Way to go, Dennis! 
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By ponymare - 10 Years Ago
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Did you line bore the block out, or turn the 312 crank mains to make them fit the 239 block?
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By paul2748 - 10 Years Ago
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Is there a reason you don't use a 292? You're surely starting from scratch.
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By pintoplumber - 10 Years Ago
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ponymare (12/12/2014)
Did you line bore the block out, or turn the 312 crank mains to make them fit the 239 block?
We turned the 312 mains down to 292 size.
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By pintoplumber - 10 Years Ago
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paul2748 (12/12/2014)
Is there a reason you don't use a 292? You're surely starting from scratch.
Paul, it's been a year and a half since I did this. It's just something I wanted to try. I had enough money invested in this motor I didn't want to abandon it and start new. I guess I'm just a little different.
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By patm - 10 Years Ago
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Dennis, very good work and description of what you did with the 239. I have a question. Which head gasket did you use and did you have to modify the gasket in any way?
Pat in AZ
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By pintoplumber - 10 Years Ago
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Pat, I used the 272/292 head gasket. It covers up the 239 water port that gets abandoned and the black circle in the 1st picture is the tracing from the 272/292 gasket so I knew where to drill. You have to drill at an angle towards the cylinder wall.
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By patm - 9 Years Ago
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I know my response is late, but thank you for the answer regarding the head gasket you used.
Pat in AZ
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