Quote:
Originally Posted by madmaxx
Why is seat pressure important? It would seam that the open pressure would cause the valve train wear. I am pretty confident if he went with either of the next two larger cams he would float the valves unless he increased valve spring pressures or kept it below 5500 rpm's. I dont think he could ever get 600 hp, heads say max valve open is 600 where the one cam is above that.
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Seat pressure is what shuts the valves....thus keeping the valves from hanging open (floating the valves). 360-375 is adequate open pressure and I like to run around 150 for seat pressure on hydraulic roller cams.
I didn't notice what his seat pressure was....
I hope that he either bought the heads bare and assembled them, or bought them assembled and completely tore them down to check all the parts. If he did either one, he would know if he had room for a larger lift camshaft.
Some of the TFS heads make quite a bit of power. The TW-R heads will flow with a little work. They are advertised to flow 340cfm but the last batch I had flowed about 320. They took a little work to get them back up to their rated flow rate.