Our basic 500EFI kit put on a stock engine is 575HP. To get the 625HP we put new higher compression pistons, and we use a mono blade throttle body and port the plennum. If you have further questions on our packages give us a call.

Thanks
Matt

I'm at 625 with 500EFI, AFR 315 heads, cam,injectors, big throttle body and change computer. mind you when you change all of this, you need more of a fuel system as the 500 efi stock one wont handle it. Dont ask me how I know...kaboom... beware of anyone trying to tell you any different. Oh and it runs on 87 octane

What did you change, larger pick-up line from tank, aeromotive pump and regulator?

from my tank was fine, but the 500efi pump once it goes into the cool fuel drops down to fitting that is less than 3/8's wide, thats what made mine lean out and blow. go to the aeromotive pump, new regulator and bigger line from the pump up, you will also need bigger injectors. Dave at MDG rigged mine so the fuel pump and regulator stayed right on the same bracket.
there is no way in hell that by doing all these mods and not changing the fuel pump and injectors that it will live long, you physically cant put that much more air in there and expect it to last.


irish, i replyed but your pm's are full

I cleaned it out.

Anyone tried the Edelbrock Aluminum heads? Part#61559

cookin has 502fuel inj. with them heads and dyno his motor 600hp

Boy, from all the work we have done on our 675HP package for the HP525EFI I would really like to see those dyno sheet results and build data from Cookin or whoever.
Unless you do all the things like Offshoredrillin is describing you probably are not going to see 600HP from a 500efi that will live and certainly not from a 502EFI (MPI) engine intake manifold and throttlebody!
Eddie Young knows and he has the experience to back that up too.
Just my experienced and work based two cents!

Best Regards,
Ray @ Raylar

Cookin is a mainstay on Speedwake and I see him here once in a
whille. He is not a professional like Ray but has done his own builds
and has had great success. Since I can not build my own engine I
will not doubt him. Now if Minihawk or PokerRun388 made these
claims I would have to say "Bite me".

My engine started out as a 500 EFI. Bored and stroked to 540, AFR heads, Bob Maderra custom cam, stock untouched intake with the Tyler Crockett top mount throttle body kit. Aeromotive 1000 fuel pump and 55lb injectors. Assembled and dyno'd by Mark at M.E.R Performance 693hp at 6000rpm. Jeff Wurl