468 vs 496
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468 vs 496

  1. #1
    Senior Member hotbo's Avatar
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    Default 468 vs 496

    heres what i have
    100cc closed chambered heads 2.25 vavles 1.88.brodix did the heads.oval port we bought them cheap.

    i run the #s on my dd and are getting very confused.
    im limited to running a hyd,flat tappet.no soild roller or solid flat tappet.yeah it sucks,but hes not a mantinance guy
    no hyd roller either.to much money and plus i think they sucklol!!!

    it will be 10.1 regardless of the combination.air gap rpm intake,850 race demon{hate demons but thats what its got so be it}
    normal stuff roller rockers ect.

    im getting only 10-12 hp and torque by going to the 496,huh!!!!!!!!!!!!!!!!!
    the flat tappet i have is a 292h 244-550 lift.i can change that but going to anything over 600 lift is a waste on oval heads that havent been heavily worked over.i have punched in everything i can find comp cams,lunati,herbert,crane,ect.nothing seems to be alot better than the 292 all within 10hp of each other never feel that!!!!
    why is the 468 putting close to the same out,b/c my heads and i cant go roller,okay i type in roller sure it goes way up but remember no roller for this build so im screwed.

    imo the 496 regardless of what the dd shows should be a better build,the boat is a 21ft taylor lp.it has a aggressor a/b impeller and turns 4700-4800- right now with a intake ,carb and mild rv cam,dont know specs on it.

    what is your advice go 496 or stay 468.again the dd shows very litlte gain by going to the 496????????
    Last edited by hotbo; 02-21-2008 at 08:06 PM.

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    you'll feel the difference with the added stroke i say the 10-12hp gain is bs. get the compression up to 11 to 1 trav, that's still safe for pump gas. 11 to 1 496 is gonna feel a ton stronger than a 10 to 1 468.

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    Senior Member hotbo's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    you'll feel the difference with the added stroke i say the 10-12hp gain is bs. get the compression up to 11 to 1 trav, that's still safe for pump gas. 11 to 1 496 is gonna feel a ton stronger than a 10 to 1 468.
    well tom here we go again.alot of compression is going to overcome the fact that i can only use hyd flat tappet.11.1 with cc heads would be to big of a dome have to work them over and hope it doesnt chatter

    well thats what the dd sayd 10-12hp and torque bigger isnt always better the combination of parts has to work with one another,if not it will suck.

    maybe the 468 will be better than the 496 b/c i cant let it breath and hell if its gonna really air out inway in a boat that heavy.im hoping it will turn 5400-5500 maybe asking to much????WITH THOSE RPM I DONT THINK A HYD ROLLER WOULD BENEFIT ANY AT ALL.
    god i wish i could put solid in it.I HATE ANYTHING HYD.

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    The 496 is going to make more power I don't care what DD says. Longterm a hyd roller will be your best bang for the buck. With the Gov. controling what is going into oil formulas, the quality of some flat lifters and cam cores, you wipe one flat tappet out on initial start up you will have more then made up for the cost of a hyd roller.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

  7. #5
    cfm
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    Going over .600" won't help on oval ports ? Huh ?????

    Get off the DD and use your intuition.

    Use a single plane on the 496.

    I've had good experiences with the marine Demon 850's.

    BTW: Will be very hard to overcam a 496 with good oval's .

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    cfm
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    Ooops, I think I missed something. The heads are OEM closed chamber heads that Brodix did work on ? Or are they Brodix Oval Ports ?

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    Quote Originally Posted by cstraub View Post
    The 496 is going to make more power I don't care what DD says. Longterm a hyd roller will be your best bang for the buck. With the Gov. controling what is going into oil formulas, the quality of some flat lifters and cam cores, you wipe one flat tappet out on initial start up you will have more then made up for the cost of a hyd roller.

    Need to listen to him on this!!!


    We spend our life with flat tappets, and saying they suck is an understatement!!!!
    Especialy with today's oils.
    As Chris said, one problem with a lobe and you have paid for the hyd roller set-up. Going this direction will cost a couple more bucks initialy, but more power and still low maintenance..nothing like having your cake and eat it too!!

    I am sure he could set you up with one that fits your combo like a glove!

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    Senior Member Bigblockbill's Avatar
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    I had the same thing happen to me on the DD going from 522 to 555, and even going from 9.3:1 to 11 :1 on the compression. The program only showed picking up a couple hp. I am chalking it up to my heads chocking the motor down and not flowing enough. When I increased the flow of the intake & exhasut cfm on the heads the numbers jumped way up.

    As you go up in cid the heads need to flow more cfm and many times end up limiting things. I am guessing here and trowing a dart with no data to back my claim up not knowing what your intake CFM flow is bet you need more head. Try running the program with something in the 340-350 cc range on the 496 and then see where you are.
    Last edited by Bigblockbill; 02-21-2008 at 12:35 PM.
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    Senior Member Bigblockbill's Avatar
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    [QUOTE=Warp Speed;64000]Need to listen to him on this!!!


    We spend our life with flat tappets, and saying they suck is an understatement!!!!
    Especialy with today's oils.
    [/QUOTE}

    I spend NO life with flat tappets. Had two fail a few years ago, now its rollers or nothing for me and the motors I put together. First one took out the cam and all the bearings. Second one was 2 days after I got my new boat home from CA and once again cam and bearings and a lot of work. (was probably dying even before I bought the boat) I would wager a bet at almost .600 lift its one or two in ten that don't make it. (Anyone have a better stat on this?)

    If you do run flat tappets be sure and use diesel oil as it has more zinc in it.
    24' Eliminator Fundeck

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    Senior Member hotbo's Avatar
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    well guys i for one have broke in a ton of flat tappets and had 1 go down my fault to much pressure.i broke in 3 comps last year neah a problem


    okay thats my point im stuck with these heads is it still worth it to go to 496 and roller?????


    i have been told hyd rollers are valve dropper b/c the spring packages are to much for the shitty lifters???/thats why im on here.tell me

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    you'll feel the difference with the added stroke i say the 10-12hp gain is bs. get the compression up to 11 to 1 trav, that's still safe for pump gas. 11 to 1 496 is gonna feel a ton stronger than a 10 to 1 468.
    Tom, 11-1 you may get away with on a shorter stroked motor with alot of overlap on the cam, but on a 496 with a small hydralic cam and oval port heads, it'll rattle its ass off on pump gas. Listen to Chris , he knows what he's talking about. Let him build you a hy roller, We've ran one in a bigblock NOS street car and it worked well, even though the heads dont flow well, if you hang the valve open longer you'd be surprised what they'd do. The 496 is going to be choked with the little heads. I'd stay 468

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    what are you callin alot of duration?

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    Senior Member hotbo's Avatar
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    well talked to chris on the phonebrodix ix flowing 1 head next week then gotta decide whether to go flat tappet or hyd roller,if i had it my way it would be solid roller all day but its his money and boat.i told him how much for a hyd roller he shit him self maybe hell get over it,lol!!!!!!

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    Quote Originally Posted by hotbo View Post
    well talked to chris on the phonebrodix ix flowing 1 head next week then gotta decide whether to go flat tappet or hyd roller,if i had it my way it would be solid roller all day but its his money and boat.i told him how much for a hyd roller he shit him self maybe hell get over it,lol!!!!!!
    so he's goin hyd roller? charlie's sure worked out nice on his 502.

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