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Originally Posted by 1972C10
You cant really go by casting numbers on the main bolt count Ive had a 3970014 4 bolt block and still have a few 3970010 2 bolts Both are numbers many people swear to be 2 bolt and 4 bolt 010 being the four bolt.
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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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'70 cab, '71 chassis, 383, TH350, NP205.
'71 Malibu convertible
'72 Malibu hard top
Center City, MN
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