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Originally Posted by mrein3
I fully agree with this comment. I have in my possession two 350s. Both have the same casting number - that being 3970010. One is a 2 bolt and the other is a 4 bolt.
I still don't know why so many people get hung up over 2 bolt verses 4 bolt blocks. Unless you rev it over 7 grand all the time either will last a good long time.
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Yeah i know right ... Its beyond me Alot of high performance engines came out in a 2 bolt main configuration. They seemed to hold up just fine.