Im not sure that they do, I'll look later today. The place I had the 340 and 4 speed installed at knows nothing about these engines but is well known throughout Scotland as one of the best places to go for engine work. He has people driving 4 hours to see him. I dont think i'll be going back though, he did mention that he struggled to get a seal with the intake and has to really nip it down. :( Ive never done any of this before but Id rather learn and do it myself.