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Information on engines can be looked up a number of ways, but some of the engines you need to check everything available.
The suffix code seems to work pretty well on the older engines but on the newer engines it does not work that well. (Note bigunde's post of the CMJ suffix where it could be a 350 or a 305 engine).
Using the suffix code, block casting number and the date code will help but I don't know of anyway that codes will absolutely tell you whether you have a four bolt or not. If you want to know about the four bolt, pulling the pan is the only sure way.
Jim
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