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i just stretched the old spring about a 1/8 inch and then inserted a regular bic pen spring in the center of stock spring. really seems to fuel alot harder as more fuel is going to the injectors now rather then back to the tank!!!!
i did notice a big difference i do not have a fuel pressure gauge yet so i do not know what psi i'm at. but a guy who did this before got a xtra 37 hp on the dyno by doing this little trick. i'm happy with the results!!!