Whippled 377 versus 496 in 28 deck
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Whippled 377 versus 496 in 28 deck

  1. #1
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    Default Whippled 377 versus 496 in 28 deck

    Has anybody whippled a 377 in a 28ft deck boat. 496 seem to be the smallest engine people are putting in these boats. I have a 377 now and wonder if I should stay with this motor and wake it up with a whipple charger or trade up to the 496 ho. Is the 377 reliable when whippled? What kind of maintance should I expect? I here the 496's run along time if you leave them alone with modifications. If anybody has any suggestions I would appreciate it.

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    Not sure if anyone has done it, but here are my thoughts. A 28ft deck boat is heavy. Heavy boats need a lot of torque. The 377 w/ Whipple would make a lot of torque when it is on boost, which means the motor would be in boost mode pretty much all the time when cruising. I'm not really sure if it would be the right motor combo for a boat of that size.



    Darrell.
    San Diego.

    28ft Sportcat
    With Twins

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    A 496 your top speed will be 60-65 a 525 your top speed will be 70 -75 depending on weather and water conditions. There is NO replacement for displacement. I don't know why people order those boats with a small block?? If It were me?? I might go procharger on the 377 or twin turbo over a whipple. Just to be totally different. Keep in mind you don't see many outdrive turbo deals cause they break sh!t! But a couple a baby hairdryers on a small block would be way cool.

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    Quote Originally Posted by DMOORE View Post
    Not sure if anyone has done it, but here are my thoughts. A 28ft deck boat is heavy. Heavy boats need a lot of torque. The 377 w/ Whipple would make a lot of torque when it is on boost, which means the motor would be in boost mode pretty much all the time when cruising. I'm not really sure if it would be the right motor combo for a boat of that size.



    Darrell.
    Agreed. The 8.1 would make a little less torque, BUT, it would do it normally aspirated. If you were going to try a boosted small block, you would be wise to move toward an LS-based engine. Much stronger rotating assembly without actually building a blower motor. Plus, the weight savings of aluminum heads.

    However, I will say that years ago, I put a Whipple on a '95 K2500 ext cab LONG bed pickup. It was the 210hp TBI pre-vortec motor. The motor was a fresh GM crate replacement ($1290!). With a TurboCity enlarged throttle body, a pair of matched injectors, Thorley headers, high-flow cat, and Edelbrock cat-back system the truck ran like a scalded dog. Being 4X4, long bed ext cab and 3/4 ton, the engine was already working quite a bit. I pulled trailers from time to time with it and my dad ran the PISS out of it. He is a "90 or nothing" type-A driver, so that thing was in boost ALL the time. That truck is still going with 85,000 miles. Actually, it is out at my sister's place in Lander, Wyoming with a snow plow attached to the front!

    So, if the BASE model GM long block can handle that abuse with 7lbs of non-intercooled boost; I would imagine the 377 would not have too much trouble. Still, constantly pushing a large deck boat around in Havasu heat is no small task.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Thanks for the input. I'm leaning towards the 496 with Dana headers. I think I'll like the reliability better with this option. I have to think of resale in the back of my mind as well and the 496 seems to be the least amount of motor put in these 28 decks. Dollar for dollar the engine builders/ mechanics have been steering me towards the 496. Were coming into winter so I have a little more time to research and tak to a few more people. Again, I Appreciate the advice guys.

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