IMO-
Maybe not worth it, unless building a high end motor. Anything over 450-500 horsepower is going to be overkill. If you have extra money to spend, spend it on porting the heads. And if you have a big cam and if it is going to be all top end.
Maybe not worth it, unless building a high end motor. Anything over 450-500 horsepower is going to be overkill. If you have extra money to spend, spend it on porting the heads. And if you have a big cam and if it is going to be all top end.

Or are they fine for the street, but not the track?