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The Engines do look identical, but there are other ways to tell, assuming that the car is in completely stock condition. First of all, how may tailpipes does it have? if it has factory duals, than it's a 5.7. If it has single exhaust than it's a 4.3. Also, check the SPID label. It's on the underside of the decklid. if it says LT1, than it's a 5.7, if it says L99, than it's a 4.3.
 
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