Originally Posted by darrensls1

You really need to do some research. ALL LS1's are 345 HP. Let me say that again. ALL LS1's are 345 HP. How can I say this without a dyno sheet? Because all LS1 motors came from GM with 345 HP. They rated the corvette correctly. Then they underrated the SS/WS6 to not step on the toes of Corvette buyers. Then they underrated the Z28/TA even more so they could sell Ram Air hoods.

Do a search. Everything I stated is a well known fact. Not gossip or hearsay, but fact.

This is why LS1's dyno 280-315 rwhp in stock trim and run solid 13's in the quarter (sometimes even high 12's).

Originally Posted by 98Z28MASS

This is not completely true, not all the ls1 engines had the same equipment. I know my 98 had a slightly more agressive stock cam than the later ls1's but the heads flow worse than the 99+ heads and it has an ls1 intake, whereas the 01-02's have an ls6. Not trying to knock the fact that they will put down similar numbers, but not all ls1's are made the exact same. I agree though that they stated the corvette as 345-350 horsepower and the f-bodies lower so that people would believe that they were getting a diff/better engine, which isnt true.