[Alfonso M]

the engine casting number to the left of the distributor is 3921968
GM
49..............................is that the original engine on the car(64 biscayn).....also what type of engine is it i know its a 6 cylinder but is it a 230?or a 250????can anybody help me out??????????

 

[60 Bel Wagon]

Hope this little bit of info helps out, this web site says that most standard models came with a 230. I thought I had a casting #'s book for all Chevy's but it only covers V8 models sorry can't help ya there.
http://www.348-409.com/1964factpage.html

 

[Biscayne67]

If it's an straight 6, try this link. There is some great info here about inline engines.

http://www.inliners.org/ubbthreads/ubbthreads.php/ubb/cfrm

 

[BISCAYNE63]

3921968 is the exact casting # on my engine, thats how i found this forum!
i was serching online to find out what year engine i had in my 63 biscayne because i needed a crank pulley and every auto parts i went to said that they could not get it and that i would have to go to a junk yard!
so i typed in my casting # in a search engine and found this forum!
and i also found out that my engine was a 64-67? but i know 64 for shure. i was able to get the pulley the next day!
lucky for me the guy that i bought it from replaced the motor!