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Ford 801 Powermaster 172 Cubic In block

1

10 bluebird

New User
My tractor threw a rod and I had to get another block. I had a 172 diesel block. The block I got to replace it was Conn6015J. Obviously this was a gas block because when I went to mount my balance gear to mate up with my crank one hole was not bore deep enough and it didn't have a hole on the other side period. So I took it to the machine shop and they bored and tapped it for me.

I thought my problems were over but when I went to put the head on the bolts do not work, mu block is 5/16s and my old head bolts are 7/16s and the holes that are in the block line up but my head has other holes that are not in the block. Please advise on what I should at this point. If I bore the existing holes from 5/16s to 7/16s and bore additional holes so the head will work, will my rocker arm assembly work valves work right/ etc.?

Thanks :(
 
I don't know the answer to your question, but maybe this information from John Smith's website will help, if you haven't already looked at it:

Part number identifiers cast into 134 and 172 engine blocks (lower right side)
EAE 6015 - 134 1953-1957
EAF 6015 - 172 1953-1957
310905 - 134 1958-1959
310609 - 172 1958-1959
B9NN-6015C - 134 late 1959 early 1960
B9NN-6015A - 144D late 1959 early 1960
B9NN6015J - 172 late 1959 early 1960
B9NN6015B - 172D late 1959 early 1960
C0NN-6015G - 134 sleeveless late 1962-1964
C0NN-6015H - 144D late 1960-1964
C0NN-6015C - 172D-G late 1960-1964
C0NN-6015J - 172 late 1960-1964

Based on this it's not clear if the diesel required a different block. I can tell you that my '60 961 has block casting B9NN-6015B which according to above is a diesel block but the tractor is gas powered.
Someone will be along with better tech info... Will
 
You need a diesel block. On the older 172's the gas and diesel blocks had the same casting number but the diesel blocks have 6 more head bolt holes than the gas block, as you learned.
 
i agree.. get the correct block with correct # of holes.. trying to retro something like this is going to make a pig in a poke...
 
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