Update on this engine, I got it up to 642 HP at 5800 rpm with a lot of tuning and pulling some water out of the exhaust which seemed to be holding it back a little on top.

Arcticfriends - looks like Jwurl and MER went thru this very thing with 500EFI intakes and then aftermarket 2000cfm tbody on Edelbrock carb type efi manifold.

They had done the tbody on 500EFI intake that Crockett does.

Post #340 here: http://www.offshoreonly.com/forums/g...ml#post4166342

and

[QUOTE=SB;4486150]Arcticfriends - looks like Jwurl and MER went thru this very thing with 500EFI intakes and then aftermarket 2000cfm tbody on Edelbrock carb type efi manifold.

They had done the tbody on 500EFI intake that Crockett does.

Post #340
They could have gotten much further IF they had bought mefiburn and were able to tune it on dyno, i made HUNDREDS of changes while tuning my last mpi on dyno, on something that modified i cant see a canned tune being ideal. Im also doing runner length changes in steps, will post data when i get started, Smitty

Also using the tpis throttle body on this 500efi project, flows 22% more than all the others typically upgraded to, along with that comes extra work to get it to work but we are gluttens for punishment!
https://www.tpis.com/parts/view/269

To add a little more to this thread. A few years ago I built a nice 598. Just to experiment, I used a 500 efi base and built a sheet metal top with 4 2bbl throttle bodies. Torque was fantastic but it pretty much quit at 5400 rpm, making 730 HP. I switched it out to a dart tunnel ram with the 4 2bbl throttle bodies on it and made 800 HP at 6000 rpm. No other changes. Lost a lot of torque down low though. I actually had to drop down an inch in pitch to get it out of the hole satisfactorily. But gained 4 mph on top.

Bob

I know where theres a pair of low low hour 525 intakes,TB's fuel rails and injectors, no pcm's or wiring :bunnydance::bunnydance:

Hey guys,

I don't mean to hyjack the thread but my questions are in regards to the intake on my motor. From what I've read so far in this thread, the 500efi intake tops out making power around 5200rpm and can be restrictive on air flow when trying to upgrade performance on an engine build. Over this past winter I had my 500efi completely rebuilt, including being bored over to 516cube stemming from a previous owner having the engine rebuilt and bored to a 509 after valve failure. I had to bore again due to the previous work not taking enough material to correct the scoring on the cylinder walls. dart pro 1 heads, larger cam(don't know the specs) and balanced and blue printed bottom end. The engine dynoed at 585 hp at 5300rpm peak and 640 ft lbs of torque at 4000rpm peak. I was told I could build more power at a higher rpm, but my original 500efi intake was restricting that. I was told the 500efi intake builds lots of torque vs the 525 intake which is better at building HP. It was explained to me that 500efi has longer channels/ guides where as the 525 intake has shorter ones. Would I benefit if I could get a 525 intake? Would it be worth it? What would I gain in HP and how much would one cost and also to install?

With all things the same besides changing out the intake, dont think you will see any gains, who reflashed your ecm ??

the stock intakes to restrictive for the cost, far better off using a aftermarket intake and TB

PMed you