Ok guys, I need some input. As some of you have seen from previous posts I have started, I am looking to upgrade my power a little. I was kicking around the idea of increasing power in my 454 magnum. But, I have scraped that idea due to the horror stories I have heard of with getting the ECU re-mapped correctly. As I stated before, I am not looking to make big power, I would be happy with an HP500EFI.

So here is the part that I need input on. I found an HP500EFI that has about 90 hours on it. BUT, it was used in a F1 boat. The guy seems to have taken care of it, ie: oil change, plugs etc after every run. My problem is since I personally have had no experience with one of these motors, I question the beating that 90 hours of hard running has done to this motor. I know that they are built to run but how long can they take it without needing a tear down. I have heard that at 200 hours, you should change the valve springs and lifters. But what about the rest of it ? Any of you guys running this motor hard and if so any troubles?

Thanks for any info. And I wont be able to answer this post for a week, I am leaving tonight for Arizona and Las Vegas. I hope that by the time I get back, I have some good information.

If the 500EFI you are looking at is a fair price for a raced motor then I would go for it. I know a F1 racer that had a motor for sale so I might be able to give you some background on him. If it's him. Shoot me a PM or E-mail.

Eric

How about it guys, any one else have something to add???????

Checkmate, I know the guy who you are talking about, I just put one in my Donzi 26ZX and that is all I have to say is that you won't be disapointed!!!! I picked up 12 miles per hour from the stock 454 MPI. It will be the best 10K that you ever spent, let me know how you make out if you decide to do it!!!!!! The motor that I picked up had 30 hours on it and 17 of the hours were run under 1000 RPM's. Good luck!!!!

How about a 500hp complete takeout. Had 42 hours, rebuilt by CRE and sealed. Dyno and breakin only. Best offer.
JB

I also just replaced a 7.4 mpi for the HP 500 EFI. I bought the motor from LEE on the board. It has 40 hrs on it and it is awsome. The best $ I ever spent for the boat. I went from 61mph to 82 on GPS Go for the motor it is worth it. It should give you many hrs of trouble free service. They are built to last.

Short of checking the valve train at 250 hours, I don't see why you couldn't get 4-500 hours out of one.

Thanks guys , this is the information that I need and wanted to hear.

JohnB: Is that motor EFI or carb? Shoot me a private message if you want....

Donzi26ZX:

Thanks for the contact. It seems like a good deal. I just want to be sure it is right for me. By the way, it sounds like you got a great deal!!!! Too bad the timing wasn't right for me on that one.

Checkmate454mag,
After seeing Donzi26ZX's boat this weekend, I don't think you'll be disappointed. My father took it out (Donzi26ZX is married to my cousin) and said he hit 72 mph with four rather large guys on the boat.

Scott