hey mate im thinking about rebuilding my A15 to put in another project and im interested in the dual valve springs and pistons you used... i will be running the dual hitachi SU's, extractors and exhaust that i currently have just want some advice on some more bits and pieces.... am thinking of possible turbo setup so it has to be able to handle boost and high revs so what you have done interests me alot.... i also want to be able to run premium pump fuel without having to put the addetives in so hardened valve seals are on the list as well..... sorry for the hijack but i would also like some advise and your build sounds similar to my needs.