I recently acquired a 272 Block for parts, and just for the heck of it, but it was seized. I popped the heads off and the first thing I noticed was, one of the long head bolts was not on the end of the head but in the middle of cylinders 6&7 on the drivers side. On the passenger side it was similar. Anyway looks to me that the incorrect location of the long bolts on the drivers side caused it to seize by head gasket failure.

What do you guys think?


Drivers side


Drivers side head


Pass side



Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.

Hi, what are the casting numbers on those heads?

Thanks Cliff

Dennis: It certainly looks like what your suggesting...  Also noticed that someone has chamferred the block. This was an idea floated years ago to supposedly improve breathing. Unfortunately, it lowers compression at the same time. ( A buddy of mine made that mistake years ago on his gasser engine.)   Also, I'm told that if overdone it can result in excess heat reaching the top rings..    


Paul

Cliff,

Casting number ECZ-A


Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.

Paul,

What is exactly is chamfering the block?
I think the photo is deceiving... I’ll have another look tomorrow but it might just be where the junk is built up.


Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.

Chamfering is where the cylinders have been ground at an angle to facilitate better air flow to the cylinders.  The posted pictures do point to the decks looking as though they have been chamfered.  If the decks are flat up to the cylinders, then it’s just an optical illusion.  If the pictures had been taken at more of an angle, then the amount of ring land area at the tops of the bores would be present which would indicate if the edges of the bores had been chamfered or not.

Lorena, Texas (South of Waco)