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693 HP and 723 ft/lbs of torque

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Old 08-27-2009, 07:19 PM
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693 HP and 723 ft/lbs of torque

Just got off the phone with Mark at Precision marine, the 540 that I built is making 693 hp and 723 ft/lbs of torque. Guessing that it should make my 1999 Donzi 26 ZX move pretty good.
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Old 08-27-2009, 07:27 PM
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Just got off the phone with Mark at Precision marine, the 540 that I built is making 693 hp and 723 ft/lbs of torque. Guessing that it should make my 1999 Donzi 26 ZX move pretty good.
That is good news. Welcome to the fast 26ZX club. What kind of speeds are you wanting?
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Old 08-27-2009, 07:40 PM
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Thinking 90mph, last year on a stock 502 with 5psi of boost I saw 80mph on GPS

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Old 08-27-2009, 07:55 PM
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ZXXX, What size fuel lines are you running to your fuel pump, and how did you plumb in the return to the tank?

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Old 08-28-2009, 11:19 AM
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ZXXX, What size fuel lines are you running to your fuel pump, and how did you plumb in the return to the tank?
You should get between 88 to 90 depending on props and setup.

I am running 1/2" all the way through. Eddie Young made a custom return line to the tank. There are some pictures posted on Boatfreaks.org Let me know if you can't find them.

You are going to have fun!
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Old 08-28-2009, 12:48 PM
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Hey Bill, We're going to be around Pates Ford next weekend. Going to see if Outdrive #3 will last!
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Old 08-28-2009, 01:39 PM
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Hey Bill, We're going to be around Pates Ford next weekend. Going to see if Outdrive #3 will last!
I will be there and so will Brian Rose. Let's go burn some gas (not drives)!
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Old 08-28-2009, 01:48 PM
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Just got off the phone with Mark at Precision marine, the 540 that I built is making 693 hp and 723 ft/lbs of torque. Guessing that it should make my 1999 Donzi 26 ZX move pretty good.
Tell us more about the motor, great numbers
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Old 08-28-2009, 02:28 PM
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It is a stock Gen VI 1999 502 block. I had it bored .032 over and had a Cally's forged rotating assembly installed. I had the stock heads proted and polished. I am running Marren's 60 lb injectors, Custom ground crank that was spec'd out by Mark at Precision. M1 Procharger running Approx 5 psi of boost.
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Old 08-28-2009, 02:35 PM
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What is your initial comp? What timing? What chamber size on the head and what runner??
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