ALL 
A lot has changed in the performance cylinder head market since my last head story in EB in 2010. First of all, 600hp is the new 500hp, and if a power adder is involved, you’d better be packing 800hp to have any bragging rights at all.
View the full article: http://www.enginebuildermag.com/2017/05/call-new-power-adder-racers-known-years-cylinder-heads-key-unlocking-performance/
