How fast
 

A buddy of mine has a 29 velocity with a 496 it is a 08 boat.It gps top speed is 67 mph.How fast do you think it will run if he puts a supercharger on it.He is going to put it on the stock motor which is like 425 hp

How much boost ??

6 to 8 pounds

with no intercoolers
6# 74-76
8# 78-80

How fast with intercoolers?

ever degree dropped in intake air should be worth 1HP or about a 10% gain. The blower takes power to turn so its kind of a trade off. You could increase boost with the intercooler safely. Speed gain would depend on changes made to overdrive and timing.
Im thinking a extra 2-4 mph depending on which changes were made.

You can't put 6-8 #'s of boost to a 496. The pistons won't last.

I thought the 425 h.p. 496 (mag) had forged internals and 375 h.p. did not???

He didn't ask if the engines would last. :evilb:

Negative. Further, you can bash me now for saying so but I guarantee you that if you puff a 496 you will live to regret it... That engine is not made for it. The pistons are very brittle on both, the 375& 425 models.

Also, you need to know if you have a steel crank or cast. If I remeber, they started with steel; went to cast; back to steel on some serial number range; and then went back to cast. It's a great, reliable engine but she don't like blowers for too long...

In all sincerity, I do wish you luck and I'd like to hear that you came back 2 seasons later and had no issues worth mentioning after running a blower on this motor.

take care,
jason

Don't forget that the ONLY difference between the mag and the mag ho consists of 3 things:

1. Size of throttle body
2. Cam
3. Computer program

I still have all of these items laying on the shelf too.

How does it go again?....

Don't finger fack us with details!!!!! ;)

He was talkin to whipple about a 6# kit with a new program for the computer. They really hyped over the performance but never once mentioned longevity!

We run 20-30#s of boost in race cars but never in boats. Being that boats are always under a load, its a whole different ball game, even at 6psi....

I installed a whipple that pumps around 5-6 lbs of boost on my 2008 496HO . I ran the boat in several poker runs and ran the boat hard all summer averaging between 4500 - 5300 rpm most of the time and the boat performed flawlessly with over 50 hours prior to the whipple and over 125 hours with the whipple. I would highly reccomend the whipple it proved to be very reliable and the power that it cranks out is amazing. If you go on whipple's site I believe it's around 645HP not bad for a weekend bolt -on.My top end went from 72 gps on friday to 82 gps on Sunday.

Yup there ya go see post #5, I was close!! :ernaehrung004:

They both have hyperutectic pistons. I'm not sure about the crank and rods. I think they have varied from year to year and not sure hwats in each particular year.

Kevin, how are you?

I thought I heard that you were looking for an engine sometime recently??? :party-smiley-004:

Doing good thanks , Hope you had a good summer.

I'm actually looking to pull the motor in a couple weeks and and do a motor rebuild . I'm looking to run a little more boost and do a few upgrades cam & exhaust and maybe heads if I can swing it . I'm looking to get to around 700 hp . And maybe see 85.