I'm assuming you read this on AFR's web page?
Quote:
The 305cc comes standard with AFR’s trademark .750” thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.250” intake valves and 1.880” exhaust valves. Standard combustion chamber volume is 117cc’s on the 305cc partially ported heads. Take note the higher flowing exhaust ports and bolt pattern are raised .375 (3/8") over stock location, this rarely affects header or chassis fitment.
Properly selecting the correct aluminum cylinder head for an application depends on a large number of variables. Please consult with one of our sales technicians to help assist you in making the best decision for your particular application. (see footnotes here)
|