well here is what there website says abotu dart heads

200cc intake port
72cc Chamber volume
2.02/1.60" intake/exhaust valves

Street performance, exellent replacement for stock heads, 6000 rpm, 327/383 ci

OR

180cc intake port
72cc chamber volume
2.02/1.60" intake/exhaust valves

Excellent street or marine upgrade, maximum torque & throttle response through low/midrange 305/383 ci



in reading those what do u guys think???

Dave