My point about the Olds 455 was that this combo has already been OEM and to give some idea about what kind of engine to expect. I grew up with a 455 and for tire smoking torque it was hard to beat. With the stock 2.56 rear end it'd cruise effortlessly at 90, to boot!


The 100 hp? Comparing stock 516 heads with a decent valve job with out-of-the-box Stealths there is at least a 50 cfm advantage going to the stealths. With a 450+ cubic inch engine under them, the Stealths WILL make 100 hp more than the stock 516s.

And if you want to spend $1500 to get the 516s to equal the Stealths in terms of flow, don't come crying when they crack and turn into doorstops!

R.