Thats exactly what it looks like with the gold head and a cooling ring. I couldnt find any info on the web on it. Let me ask this though. If Class "E" is 0.459 to 0.670 and class "F" is 0.671 to 1.830, Wouldnt this engine run with the E class (seems a little unfair to run it with the .45,s ) or...