Originally Posted by rb446
Ours is on a 4.565 bore and this is what we got with our paperwork, runs fine but is only 700hp and we only use 6300rpm+its street driven>


I would think the people casting these NEW blocks would’ve at least made the walls .300 to start with. Hell my 1939 9N ford tractor has sleeves that pop in and out for easy service, I guess they were to smart back then.