You see quite a few W2 small blocks but not W5's. Must be too big of a hassle to make them work. There was a Duster at the track a few years ago with a NASCAR Truck engine but he could never get it to work well.
Don’t fall for flow numbers as the best way to select a head as PRH said. There isn’t a snowballs chance in hell the big mouth head will out horsepower a W2. Ever.
Mostly because the had is to closely based on the OE lay out.You can only get so much out of it and thats it. (Any head really)
BTW, the issue with the W5 head is Chrysler left the intake port incredibly small (the exhaust port is on the edge of being too big), the chamber sucks and the moron who decided to cut the valve spring pockets so damn deep should be publically flogged and never allowed to design anything but toasters again.
The intake side ported out pretty good on mine but did give up the ghost a little bit early. Still, on bench Brett had the heads flowed on, 312 cfm on a 4.125 bore will make good power.
Then you have to fix the chamber. Luckily, you can do it without welding.
