MadMat

I hear that a limiting factor on a 500efi is the intake.
How much hp can the motor produce before the intake is a restriction.
What is the restriction - is it the throttle body? Would using a larger bore throttle body fix it.
Thanks
Matt

t500hps

I have modified 500efi's (540's) and the intake is a restriction. We used a larger TB, ported heads, cam and made 630hp.......could have made more but I like EFI vs carb.

45SS

I spoke with Jim V. he said that a touch over 600 is about all that is there. He said it can be ported and it will help. It is in the port area where the two manifolds come together. There is not a lot of material to work with. Remember if you get an honest 600 plus, that is a large improvement considering these engines are coming through with only an honest 470 to 480 HP.

MadMat

I'd like to put one on a 540 bulldog.
Are there any other elegant efi solutions?
By elegant I mean not just having a 4 barrel throttle body on top of a "normal" manifold.

Young Performance

The throttle body on top of a "normal" manifold may not be elegant, but it works. I have tried with the 500 intake and like everyone else, made just over 600 hp. I had the largest throttle body made at the time(1300 cfm I believe), extrude honed, shortened runners, hand porting, etc. It was on a 555ci BB with 10:1 comp, fairly large hyd. roller, Dart Pro1 heads, etc. Engine would only pull to 4800 rpm and then fell on its face. It should have pulled to 5400-5500. Went way rich past 4500 and pulled a ton of vacuum. I left it on the dyno and pulled the manifold and put on the Holley set up I normally use. With no other changes, the engine made 80 more hp. With a little fine tuning, it made a total of 92 more hp over the 500 intake.
Eddie

MadMat

That's a good point, thanks. Form should follow function.

In that case, what is the best injection manifold & throttle body combo - I am keen to go injection. Not fussed abut the ECU - will sort that out seperately.

Young Performance

I really like the set up from Holley. I think it is the Commander 950. The only things I buy from Holley are the manifold, 2000 cfm throttle body, and fuel rails. I use a Mefi 4 ecm and harness, so I do not buy any of the electronics from Holley. I can not even count how many systems I have used and it works really good and is very clean.
Eddie

Griff

A 500 EFI intake won't work on Bulldog. The Bulldogs are tall deck blocks.

Raylar

Talk to the guys at FAST, they have a complete BBC fuel injection system with everything including the intake, throttle body, injectors, fuel rails, harness , hardware and programmable computer which on your 540 will make all the power you need! Just ask for a tall deck intake with it.

Best Regards,
Ray @ Raylar

Young Performance

I have run the 500 intake on a tall deck before using spacers. I wasn't crazy about it but that is what the customer wanted. It worked fine, but still didn't make any power.

The Holley kit I was talking about in my previous post is also available in a tall deck version.
Eddie