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Trying to figure out what motor is in my truck.. Found out it isnt a zz4, the heads arent aluminum. So i took a picture of the casting number. But i cant see what it is...
All I can make out is it is a 5.7L. With this stamping it will be 86 & up with a 1 pc rear main. Is there a suffix code or anything stamped on the front of the block, or get a better pic of the casting number. Pull a valve cover and run that casting # to find out what heads, are they Vortecs or std ports?