I received a Diesel head for my Irvine .20 in the mail today from Fiery, he had a couple of them. I have it on the engine already, it was missing the grub screw that tensions the compression screw but it is a standar 4mm grub screw and I had one. I will run it tomorrow. Here are a couple of pics. I nade up the 6 oz tank especially for the .20 and will try the Graupner 10.5x6 first, I also have a 10.5x5 and a 10x5.5, my Saito .30 turns the 10.5x5 at 10,400 rpm so I think the .20 should be there also.