What shops do the fuel rail mod? This is the old style 502 mag with the small supply hole on #7. For 500 - 550 hp is this the only change that needs done to the fuel rail?

Send ( Articfriends ) Smitty a pm, he's done several mod's the mpi intakes.......

Ok thanks I'll ask him.

I have the big hole rail for sale if you need one

Is it modified or newer version? If its the newer version will it work with the old style injectors?

A good local hot rod machine shop can do the hole mod. At least 20 years ago that's what I use to do, send that fuel rail to the local machine shop.

Just adding info about fuel rails in general ----- for fuel rail feed hole location -- it is best to have all injector top feed holes -- not side hole feeds. That side feed hole is really poor engineering to begin with and then to make it 1/4 of the size is even really poor on top of poor.

It is not modified both stock off a 502 mag mpi
I have both large and small
there are differences between the two

I had Eddie Young mod mine. He does a lot more to the rails then just that one small hole. My rail feeds from both ends and is drilled between the top and bottom and the regulator is blocked off and you use a remote mount regulator also the rail is highly modded on the back of it.

I read about him doing that for somebody. I assume your pushing a lot more power than i will ever see?

Yes, way more hp than your looking for. Remember too , once you do the other mods you will be running all new fuel lines and pump, cooler etc as none of it will attach to rail same way any longer, Smitty