That shitty opel/vauxhall fan friend of mine is driving me crazy about the meaning of the engine code of the valver. He says:"The code of my engine is C20XE and C is for compresion from... to... 20 is the cc bla bla bla bla"(I don't remember it anymore). So I was wondering if anyone knew the meaning of F7P/F7R
Cheers.