I originally had my 351 bored .40 over untill last summer when i blew a rod... now a bit of damage was done to the block yet it could be salvaged with a .60 bore and I have been driving like this everyday since in absolutely the most brutal temperatures and lead foot adventures and I have not had a single problem with it. Now I dont know if others have been as fortuneate but I have nothing negative to say about a .60 bore on a 351 from my experience
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