urban_cowboy

I have read a great deal at the Cleveland Forum when I was trying to decide what route to take. I am getting rid of the Torker. In fact I am getting rid of the whole setup and going with a 383 Dart stroker. Please do not think I am hostile to Clevelands. I like them, but from everything I have read, they do suffer from having TOO big of ports for the engine displacment for street use. I am not saying your engine sucks. Mine does not suck. But smaller ports in aftermarket heads would great improve my performance over the stock heads.

351 displacement cannot make use of the port volume that the 4v heads yield. It was explained to me like this. Without air being forced into the engine (i.e. a blower or turbo) air is pulled via the action of the pistons moving down. At low-mid rpms, the engine struggles to pull enough air via the large ports due tothe lack ofvelocity. There is a reason not everyone runns 215cc heads and 1000cfm carbs. Smaller ports equal higher velocity. Yes the 4v heads have potential, but they need to be coupled with either forced inductions or high rpms. If you are not using either of those, the smaller port runners in the aftermarket stuff are much preferred. IMO.

dodgestang

You forgot larger displacement

urban_cowboy

Thank you...Or larger displacment.

I think the stock intake runners are in the neighborhood of 235cc. That is way big compared to most aftermarket heads for 351 inch displacment motors which are in the 195cc range.

pigcop

Thanks for all the help guys. The info I received from you and the other forums you gave has tripled the knowlege that I had before.

Thanks again.
John