Originally Posted by LeonardoDaBenz
And Irish, he did buy it used so who knows about existing mods. He doesn't seem the kind of guy who would do it on his own.
My money is on the SLK. A few years ago, when I lived out in LA, I got to see an SS Camero run times head to head at Streets of Willow against the Mustang GT with the then new Coyote V8 rated at about 415hp. The Chevy was rated at 400hp and had only dynoed to 300hp at the wheels which told us that Chevy's real output was closer to about 350-360hp at the crank. The Mustang on the other hand out performed its claimed numbers putting down something like 372hp at the wheels. The Ford was lighter too. Yet at the slow, point & shoot type streets course the heavier, lesser powered Camero was consistently posting quicker lap times. How?
The dyno charts told the tale. Unlike drag races which are all about torque, weight and traction, the road course was rewarding the car with the broadest, meatiest power band. While the Chevy lacked the peak numbers, it did have more power over a very broad range enabling it to accelerate harder out of each slow corner While the Mustang driver was waiting for his high strung Coyote to come up on the cam. Three different test drivers drove both cars and the results were the same with all three.
so, there is power and then there is good power.
That broad and meaty, wide torque curve is one of the things that I think makes my SLK55 special. It makes lots of power down low and more up high. Now add a supercharger and you only magnify that desirable feature.
That long winded story was meant to show that the small block Chevy is not always living up to its highly touted spec sheets. I love the LS3 motor and the new LT1 in the C7 is even better. It is nearly indestructible, it gets great fuel mileage and it has a broad torque curve. But when Chevy claims it makes 460 hp, In my opinion, what they really mean is that if you test it at sea level and in very cool temps, with the right high octane fuel under perfect conditions, and test 100 units, you will at least find a few that come close to those numbers at the crank. You might even average close to those numbers. But some will be making less, sometimes a lot less. It is a mass produced engine and as such the fit of the pistons in the bores may not match the tightly held clearances of our AMG's. That is another of the reasons why you should never beat on your AMG when the engine is cold and not fully heat soaked. Give it time to warm up and it will love your for it.