Practical porting? A bit broad of a description but I’ll take it from this angle. The MP porting templates I have and I took them to a set of ported W2 heads I purchased from a member here. The templates fit in perfectly like the previous owner used them. The heads went 300+.
Charlie Servidio hand ported my race W2 heads and he found 323 cfm. It was not a find everything porting job. Charlie said he really liked the head a lot and found it easy to get 300 and it wasn’t much work finding the rest.
Charlie and I flowed tested the race heads as cast, the Econo heads ported and the race heads ported. You can see some results on his channel here —>
https://m.youtube.com/@servediocylinderheads
look for W2 in the titles.
I don’t remember off hand what the head peaks went on the as cast, but *I Think* it was 279 cfm. That should make 558 hp as cast without getting crazy on the engine.
MoPar stated
[email protected] & he found more flow at higher lifts.is lifting the valve to .650/.700 practical? IDK?!?!
The templates produced a tick over 300. The templates are a basic bowl porting and short side radius reshaping. You have to figure on how wide the short side needs to be and a FWIW, it’s not a lot.
300 cfm is 600 hp without getting crazy. But it’s going to be fairly stout. No wimpy cams and soft compression & dual plane intakes.
The race heads were a little more than the template porting and I wouldn’t call this a job and rookie or just anybody can do since you’ll have to understand what needs to be done in order to find another 23 cfm to get the 323 cfm Charlie got.
Charlie did say this is about what is practical and going beyond this would probably be approaching excessive for the displacement of the engine without getting crazy on the ports like Bill Glidden did back in the day. It would work well with the intakes keeping the stock port size and shape. He felt going beyond this would be bad since he doesn’t know the head and would have to cut one up to see where he could go. He predicted if the metal was in all the right spots, it could support enough air to run in the low 8’s and on a big displacement. Think 434/440 small block in a race setting. In which he didn’t know it but he was right.
Back to practical porting……. 300 cfm is your EZ to get number.
600hp is obtainable. More is available if you press the issue.