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500 EFI's

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Old 09-21-2007, 03:42 PM
  #11
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There are always pros and cons to any project but it all comes down to budget vs your goals. If your looking to just bolt on power, superchargers are the best way. However, if you are willing to pull the engines tare them down and have them completely rebuilt, internal mods are the best way because you can tweak those 500s to push over 600hp. If you do decide to do any internal work, I know a buddy that owns a shop in Cleveland. Gellner Engineering was recognized as a "top notch" engine builder in Powerboat magazine and has been well known in the boating and auto racing world. Call Dean at 216-398-8500 tell him PK told you to call. He can also give you more information about getting more power out of those 500s. He tweaked my 454 from 385hp over to 550hp N/A!!!
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Old 09-21-2007, 03:43 PM
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SMoooch
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Old 09-21-2007, 04:06 PM
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Ill trade ya for them 500 efis. if thay have low hrs. 540 ci 950 hp.420 mega blowers with chillers bowtie blocks all good stuff. to much for a 30 ft boat. I took in on trade looking for some 500 efis. I was going to detune them if I didnt trade them off.
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Old 09-21-2007, 05:34 PM
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Quote:
Originally Posted by tanner View Post
I am just wrapping up with the re- do of the '98, but I want to get into a twin step. I just don't want to be afraid of the 500's and so far the input has been good that I can get anywhere from low 600HP to 700 HP without major overhaul, which will put me into the 90's !
Your hooked !!
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Old 09-21-2007, 07:19 PM
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http://www.offshoreonly.com/forums/a...1&d=1190416649

engine shot of my ol' 1996 Gun
Still running great for it's current owner.
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Old 09-23-2007, 08:29 AM
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I Whippled mine this spring. I love the package, and it looks the best IMHO. Loads of power!
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Old 09-23-2007, 10:02 AM
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I Whippled mine this spring. I love the package, and it looks the best IMHO. Loads of power!



That's the set up !!! Very nice and clean.

Damn it Otis, I am hooked...... and now shopping
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Old 09-23-2007, 11:29 AM
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I put a vortech on my EFI 500 after 60 hours. It now has 240 hours and the only problems I've had is two broken drives. Comprestion is still good in all eight.
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Old 09-23-2007, 11:34 AM
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Quote:
Originally Posted by tanner View Post
I am just wrapping up with the re- do of the '98, but I want to get into a twin step. I just don't want to be afraid of the 500's and so far the input has been good that I can get anywhere from low 600HP to 700 HP without major overhaul, which will put me into the 90's !
Tanner..... The way I've seen your 98 Cig run you need to take those engines out & put them in a twin step.
I would think you would be over 100 mph.

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Old 09-23-2007, 11:43 AM
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I whippled my 500,s and I'am very happy with the power and durability. But you will have to go to bigger props or taller gearing to see the gains you want for the money. Expect to have some drive failures.
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