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Discussion Starter #1
Does anyone know of a physical diference between an L99 & an LT1 engine without tearing down the engine?
Thanks for your help.
 
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Discussion Starter #2
umm... if it's still in the car, check the vin. If not, act like you know what you are talking about.
 
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Discussion Starter #3
if its out of the car look for 4.3 stamped on the block of the motor
 
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On the drivers side of the block an LT1 will say 327 an L99 says 588 behind the drivers side head either 4300 or 5700 will be cast in as well take a guess at which is which.
 
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