853 vs 241 heads...
They are virtually the same other than castings...241 may have a slight edge there. No difference as far as In/Ex Port vol.(cc) 200/70 and Combustion Chambers(cc) + gasket vol. 66.67.
On The Tree
Joined: Jul 2008
Posts: 170
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From: Over the rainbow
The 853 heads came standard in most '97-00 LS1s. They had 67cc combustion chambers. They were superceded by the 241 castings, but the flow and performance were virtually identical.
The 243 heads were introduced for the first time in the '01 Z06 Corvette. They featured higher flowing ports, smaller combustion chambers, and for the Corvette only, they also had lightweight valves. Today, the 243 head is used in many GM applications from the LS2 engines used in C6, GTO, Trailblazers, to the 4.8 and 5.3L motors in GM trucks and SUVs. They are a nice step up in power compared to the 853 heads.
The 243 heads were introduced for the first time in the '01 Z06 Corvette. They featured higher flowing ports, smaller combustion chambers, and for the Corvette only, they also had lightweight valves. Today, the 243 head is used in many GM applications from the LS2 engines used in C6, GTO, Trailblazers, to the 4.8 and 5.3L motors in GM trucks and SUVs. They are a nice step up in power compared to the 853 heads.
