Hi! I'm a newbie and I cannot find anywhere in the world correct part number of the RC Engineering injectors for my 4efte engine! You see there are two types: SL4-0440 and SL9-0440! What is the correct type and what is the difference? We are dealing with a "stuck" injector when it gets very hot maybe, so we are looking forward to replacing all of them! Injectors that I have now are from an RX-7 460cc but they appeared this kind of prob! Thanks a lot for your support! pamarakos