165cfm?? Mats, I'm talking about ONE cylinder,
not the sum of all four, heheh! If you have a flowbench showing 165 on an Alfa 2valve head, here are some suggestions: a)read operating manual again, b)calibrate bench, c)plug giant external leaks, d)trash bench, e)stop drinking long enough to measure properly

If you still get 165cfm, call for backup, lock head
and head-porter in bank vault and sell
both at Sotheby's or Christies for absurd amount!
Any more questions?
Ok, I have to get you off my back, so here's what the Superflow crystal ball says for you:
165cfm for a 500cc cylinder will give you 72hp/cyl at 11krpm.
At 8.5krpm a 500cc cylinder will make 55hp and you need 'only' 128cfm total intake flow. Strangely enough, the extra flow is not useful at this rpm.
Its very curious from all this to see how BTCC engines made 295hp at a rules limit of 8500rpm?? Maybe their tachs were off a couple of thousand rpm...

For that power you need 170cfm which is possible in very good 4valve heads, but the rpm is more than 10k!!Who am I to solve this? The hell with it!
Jim K.