The Dart 227cc is vastly superior to the 230cc because of the altered valve arrangement. I ran them without offset rocker or lifters. Which a smart person would use. They cost about $1000 more than Pro1 200 - 230's
Vetteaddict - The posted 230 figures that 71 listed are for the rough casting. Do your heads show any signs of factory bowl blending and port contouring? The reason I ask is I ordered my original Pro1 215 cc with the optional 2.08/1.625 valves the ports actually arrived at 221 cc. I had them hand port balanced flowed.
Location: Never argue with Morons. If you do, you'll lower yourself to their standards, and they'll win, based on experience !!!
Based on their Pro 1 215cc and Iron Eagle 230cc flow numbers I have I would estimate they would flow out of the box in the 285-295 cfm range at .700 lift. I never trust advertised flow numbers from the manufacterers own website
A cnc'd version of any of these heads vastly improves the flow at an additional cost of at least $1000 as gkull states above
__________________ 1980 Corvette, 427ci Motown SBC 465RWHP N/A so far,500 is the goal, AFR 227 Eliminators
T&D Shaft Rockers,Vic Jr, XR286R solid roller,248/254 dur .640" lift 10.6:1 Mahle pistons
Eagle stroker rods, 4 in. Callies DragonSlayer crank, 825 Drag Race Demon, 3 in exhaust Paint by Dream Car Garage......................................My'70 CUDALotsa ladies and lotsa trouble
I found a web site the otehr day with all kinds of flow data for all kinds of heads, it even has a cool calculator so you can see at what rpm you should make maz hp, i dont know how accurate it is but id like to know if someone else knows, anyways, heres the site http://users.erols.com/srweiss/tablehdc.htm