Originally Posted by Cab_Burge

Why do that when you can increase the exhaust duration, if needed work When the exhaust valve opens it has a bunch of cylinder pressure waiting to escape, open it sooner to let it out longer if needed up twocents
The B1 and B1 MC heads(2.40 intake) both have 1.75 exhaust valves is what I'm remembering scope [/quote]

Cab I guess my line of thinking is on 516 heads they have small exhaust valves and 1st thing everyone talks about is putting in bigger valves to help it breathe, I know comparing 516 heads to trickflows isn't apples to apples but they are smaller than Indy EZ's and Victors

71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's