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26 foot Force cat with cuddy and open bow. Installed whipple along with good set of pistons and rods on 496HO went from 70 to 88 on gps. Mid -range is great. 30 pitch ( not Labbed):):)
 

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27 hallett with 700 Paul Pfaff engine , maybe 625 hp on it's best day,bolted on 3.3l whipple , went from 78 to 96 mph gps...
 

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Punk in Drublic
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How Much $'s?

26 foot Force cat with cuddy and open bow. Installed whipple along with good set of pistons and rods on 496HO went from 70 to 88 on gps. Mid -range is great. 30 pitch ( not Labbed):):)
If you don't mind me asking, what was the dollar outlay for this upgrade in power?:)hand
 

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Discussion Starter #5
I spent approx 17,000 on upgrades. That includes motor coming out and block being deck, bored. Went through stock heads just to make sure.
 

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Punk in Drublic
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I spent approx 17,000 on upgrades. That includes motor coming out and block being deck, bored. Went through stock heads just to make sure.
So roughly $1K per MPH. How many hours were on your HO? I've got 150 on mine and looking to upgrade power over the winter season. Want mid to upper 80's MPH. Thanks!:)devil
 

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Depends on which HO you have. If yours is an older one with a motorola computer you are limited. That computer cant be reprogramed, but should have a forged crank. If it is newer, you need to change the crank, pistons, rods, slap a blower on it with some boost(6-8psi) and get the computer remapped. That will get you where you want. I rebuilt mine last winter( mine is the old one) and can only get 81.The motor had a procharger on it for four seasons when i decided to freshen it up. I had the heads ported and polished but made no difference in regards to performance, the computer held me back. Hape this helps
 

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Punk in Drublic
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Depends on which HO you have. If yours is an older one with a motorola computer you are limited. That computer cant be reprogramed, but should have a forged crank. If it is newer, you need to change the crank, pistons, rods, slap a blower on it with some boost(6-8psi) and get the computer remapped. That will get you where you want. I rebuilt mine last winter( mine is the old one) and can only get 81.The motor had a procharger on it for four seasons when i decided to freshen it up. I had the heads ported and polished but made no difference in regards to performance, the computer held me back. Hape this helps
2005 built HO. I'll have to look into wether it has the Moto puter. Was originally thinking about a 525 as an upgrade, but like that whipple bump in HP! Oh, shouldn't the exhaust (headers) be changed or upgraded? I'll need to change out the steering and am now also thinking bout the drive toughness...Sounds like the kids won't get any presents for Christmas!:)devil
 

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The 525 will be your best bet but still wont be enough for high 80s without a supercharger. I believe the the HP500 is better suited for boost. With a 525 they basically convert the electronics back to a HP500 and supercharge it so dont waste the extra dough if you are looking for the extra power.
 

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Punk in Drublic
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The 525 will be your best bet but still wont be enough for high 80s without a supercharger. I believe the the HP500 is better suited for boost. With a 525 they basically convert the electronics back to a HP500 and supercharge it so dont waste the extra dough if you are looking for the extra power.
...as a point of reference then, a whippled HP500 is what you suggest as a possible cost effective power upgrade? Are we talking roughly 700 to 750 HP? I appreciate your feedback!:)devil
 

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Call Whipple and talk to them about there kits. You can make 700-800hp with no problem. Make sure that motor you plan on using has good internals and is fresh. You will then need to make sure you build your drive to hande the extra power and add external steering if you dont already have it. Once you start adding this all up you will be somewhere between 20-30K. A stock 496 just may not be so bad after all.
 

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Discussion Starter #12
My 496ho is a 2007. Only had 39 hours on it when I did upgrades. Talked to many people that said the weak link was the 496 piston. I wanted the piece of mind. Once shop compared the stock piston to Ross or JE piston I didn't think twice. A lot more meat on good forged piston from ring gland to top .I also heard same remarks when It comes to early computer.
 

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The pistons are the weak link. They do not like boost. If you are carefull they can last under low boost. I had six seasons on mine(four with a Procharge) with no problem. When I did the rebuild they were tired but not damaged. If you want real power(boost) you will need to change the rod/piston combo.
 

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Nothing in the bottom end of a 496ho likes boost. A buddy had about 2 1/2 seasons on a brand new 496ho with a Whipple. He did NOT beat on the boat at all, and performed PERFECT service on the boat. At the end of the season the crank snapped in half. The entire front balancer and pulley fell off in the bilge. On the 496 crank, there is a 1/4" hole drilled into the crank and a pin inserted. This is to positioned about 3" from the front of the crank, and is what stops the balancer from being pushed on too far. Well it is also a very poor design and causes a weak point. The crank broke in the center of the drilled hole. Luckily, the motor simply stoped turning, and there was no damage to the rest of the motor. The block and heads will be the only things to be reused, the rest will be new FORGED parts. After seeing this and hearing other tales of supercharged 496's, I would look for a stock 502, or simply build your own. It's not worth the headache.


Darrell.
 

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"It's HONDO, honey"
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Anything over or equal to a 4.250 stroke MUST have forged parts. Check out a Callies crank very good products and they got a sale going for a 4.250 for 695.95 balanced and cut with a 1/4 keyway, 4340 forged
 
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