427 coming along

[tpepmeie]

Originally Posted by Pete

Man did we ever screw Todd,sorry Todd
Maybe start a new thread.

If we can get a couple of sponsers for gaskets,car,dyno time/expense we can do the testing that Paul mentioned.

I'm also interested to see what the magic porting # would be.

Pete

Man you guys can screw up a good thread! Appreciate all the comments, although I didn't mean to start a "mine is bigger than yours" argument. I think a lot of the trend toward big holes is to get the flow #'s up. As long as the required airflow can be achieved, smaller is thought to be better. If anybody is really interested, search SpeedTalk for "discharge coefficient".

Ryan is right...SpeedTalk forums rock. I've learned a ton from those guys.

I am making a polyurethane port mold of my heads & housings today, just to get a better idea of the shape and area throughout. The inside mic shows a min cross sectional area not much bigger than the stock casting.

This A-B test you guys are talking about would have to include swapping both heads and housings and plenum. It all needs to work together. Huge port heads on small port housings would not be a fair comparison, and vice versa. I would offer my stuff for such a test, but it would be tough to just bolt on to someone else's motor. Valve stem heights are different, lifters are different, cams, and so on. Can't discount the need to tailor the cam profile to the port velocity either. That was a primary input into the lobe profile (ie, flow at different lifts, and port velocity).

Good stuff guys.

Todd