Engine size

you might have to do some degreasing and use a wire brush. but look for the stamp just above the passenger side motor mount. backwards of the fuel pump
it looks like this....

13.jpg
 
A less precise way on a pickup is to look at the mounting bolt holes on the dipstick. They are 1/2" apart. If the bolt is in the lower hole then it's a 304, upper 345 or 392.
 
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