I'll never go back to a carbs, the reliability of a properly tuned efi is 100% worth it. your limiting factor will be your drives. i think with a stout long block and a whipple 3.3 you could be 850 plus... my 509s are at 850 right now with 4.0 liter whipples, and its been a dream. im going with smaller pulleys and a more precise tune and taking them up to 1000. they do have efi with throttle bodies for roots style blowers that can be run with a holley fast system.

Eric, Look at what Dan "ICDEDPPL" did with his. The Holley setup looks fantastic, the tech is figured out, and relatively easy to install. He makes really good power with 10-71s??? (I may be wrong here)

I think 5 years ago this was a bigger concern, but now the technology has caught up, price has come down a little, and reliability is good. Seems like less of a frankenstein / tech experiment and more plug-n-play.

One thing I do not prefer with carbs is how much fuel they have to run on a bigger blower setup. With the newer fuel injection setups, fuel management & tunability is a big benefit. If you're going thru all this, "why not" go fuel injection?

I was going to mention this also, he dropped some coin doing this conversion and turned out great

https://www.offshoreonly.com/forums/...nture-6-a.html

I really do love the efi stuff and lives my 575s. Everyone just says it’s a limiting factor and the stick injection can’t hand over 700hp. I lave a bigger cam and with 871 blowers I would imagine I could make over 700hp? Mabye just keep the stock stuff ?whipple stuff a little out of my price range at 10k per moter I have a ton of other things that came up in the build as we all see lol. I’m going to look into that holly stuff. I’ll reach out to dan and see what he says.

Dan is running bigger power, 900hp? The Holley EFI stuff replaces a carb setup. I doubt it has limitations untils you get over 1,000hp? I'm not well versed, reach out to Dan. I do not think it was $10K/motor....

https://cimg5.ibsrv.net/gimg/www.off...87b28eb42f.jpg
Holley EFI.

Money well spent

I think I the holly stuff will support a ton of hp. My stock injection has limits tho. I think the limit is around 700 ho on the stock throttle bodies. On the Holley stuff what the best places to purchase from and get info from ?

I was quoted 10k each for make it work on my 725s. that's why the motors have carbs lol

Looks awesome! How much power and approximate cost please?

Yes seems carbs are way cheaper carbs are about 700 new so that 2800 for all 4. I have all the original 575 efi just don’t know how much power will be left on the table with them .