351C ID numbers
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From: chicopee us
351C ID numbers
Does anyone know how to identify a 351C, 351HO, 351CJ by the block numbers? I have a 72 351 4V, 4 bolt mains, 4 barrel heads, cast iron intake. Don't know if it's a 351C 4V, 351HO, 351CJ.
Mountain Pass
Joined: Sep 2001
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351C ID numbers
Nope! Block #s will be the same. Its the head #s you need. HO would have adj. rockers, CJ and 4V are the same thing after 71, 71 actually being the only year CJ was so named. So that being said, you my have a HO if you have adj, rockers, otherwise you have a good 72 4 bolt 4V. Pop a cover and see
Tuned
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351C ID numbers
[updated:LAST EDITED ON 04-Apr-02 AT 01:29 PM (EST)]> Does anyone know how to identify a 351C, 351HO, 351CJ by the block
> numbers? I have a 72 351 4V, 4 bolt mains, 4 barrel heads, cast
> iron intake. Don't know if it's a 351c 4V, 351HO, 351CJ.
Look at the tag held down by the same bolt that holds the coil down (if it is still there). On it is an engine code which you can decode to tell you the exact engine. Please let me know if you need help decoding the number, as I have a book. They are probably online somewhere - such as one of the mustang sites. Based purely on numbers shipped, you probably have a 351CJ or 351-4V. If you've got the 4V it is actually higher performance/compression than the CJ!
Tom
> numbers? I have a 72 351 4V, 4 bolt mains, 4 barrel heads, cast
> iron intake. Don't know if it's a 351c 4V, 351HO, 351CJ.
Look at the tag held down by the same bolt that holds the coil down (if it is still there). On it is an engine code which you can decode to tell you the exact engine. Please let me know if you need help decoding the number, as I have a book. They are probably online somewhere - such as one of the mustang sites. Based purely on numbers shipped, you probably have a 351CJ or 351-4V. If you've got the 4V it is actually higher performance/compression than the CJ!
Tom
Tuned
Joined: Jun 2001
Posts: 266
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351C ID numbers
[updated:LAST EDITED ON 04-Apr-02 AT 01:30 PM (EST)]>Umm, correct me if I'm wrong, but wasn't the only 351C in
>the US to get 4 bolt mains the BOSS 351 in 1971?
Most of the 351-4V and 351CJ engines had 4-bolt mains as well, as long as those engines were shipped (1973?). From what I have read, since the 2-bolt mains were so strong they did not worry if they had to ship some of the perfomance engines with 2-bolt blocks when 4-bolt blocks were out of stock. I would not be too surprised to see some of the 2V engines with the 4-bolt blocks either - since they could easily substitute depending on what they had on hand.
There are no hard-and-fast rules either regarding casting dates and what years certain parts or even engines might be found. For instance, if they got to a new model year and an engine/intake/head/etc was supposed to be discontinued - they would keep stuffing them in until they ran out.
Tom
>the US to get 4 bolt mains the BOSS 351 in 1971?
Most of the 351-4V and 351CJ engines had 4-bolt mains as well, as long as those engines were shipped (1973?). From what I have read, since the 2-bolt mains were so strong they did not worry if they had to ship some of the perfomance engines with 2-bolt blocks when 4-bolt blocks were out of stock. I would not be too surprised to see some of the 2V engines with the 4-bolt blocks either - since they could easily substitute depending on what they had on hand.
There are no hard-and-fast rules either regarding casting dates and what years certain parts or even engines might be found. For instance, if they got to a new model year and an engine/intake/head/etc was supposed to be discontinued - they would keep stuffing them in until they ran out.
Tom
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