rec vs oval
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rec vs oval

  1. #1
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    Default rec vs oval

    In a nut shell, going through a basically stock 454 (headers, manifold, 750 holley) that is in a 20' Cole I/O. It will be getting a small cam this time around. Question is, it has peanut port ovals. What gains can be expected going to rec port heads (990's). Have to do the heads anyway and can up grade for a few hun.

    Thanks

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    go with some 049's big oval ports, leave the rect ports for someone who's gonna rev high nuff to use em

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Mild porting = 450+ HP capable, but waste of time and money. Normal oval ports with big valves and pocket porting = 575+ HP capable and your best bet. Square ports = 675+ HP capable w/porting and too big for your deal, and they will kill the gas mileage, along with throttle response. We are in Avondale,Az(west Phx) and specialize in jetboat engines and pumps. Call during business hrs, ask for TIMM and we can discuss your goals. Make sure that you curve your distributor too, most that we have seen don't provide the best power or mileage for boat use. We have core heads and are also W/D for everybodies parts, and there are some real bargains out there currently. We have built quite a few engines for river dwellers, call for references. We have a complete machine shop and perform ALL operations in house for engines and pumps. TIMINATOR 623-877-8553
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  6. #4
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    Quote Originally Posted by TIMINATOR View Post
    Mild porting = 450+ HP capable, but waste of time and money. Normal oval ports with big valves and pocket porting = 575+ HP capable and your best bet. Square ports = 675+ HP capable w/porting and too big for your deal, and they will kill the gas mileage, along with throttle response. We are in Avondale,Az(west Phx) and specialize in jetboat engines and pumps. Call during business hrs, ask for TIMM and we can discuss your goals. Make sure that you curve your distributor too, most that we have seen don't provide the best power or mileage for boat use. We have core heads and are also W/D for everybodies parts, and there are some real bargains out there currently. We have built quite a few engines for river dwellers, call for references. We have a complete machine shop and perform ALL operations in house for engines and pumps. TIMINATOR 623-877-8553
    SPAM!

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    Quote Originally Posted by Warp Speed View Post
    SPAM!

    ya think

    go with the 781s or 049s and put some bigger valves in them.youll be plenty happy.travis

  8. #6
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    If you're gonna stay in the 4000-6000 RPM range, the large ovals will be just fine. Casting numbers 049 and 781 seem to be the most popular ones. I agree with Timinator on having them set up with the rec port valves though (2.19" intake/1.88" exhaust) and decent gains have been reported from people who have had mild port work done to 049s.



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    Senior Member CK7684's Avatar
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    My boat originally came with 990's and they worked just fine. On this new motor, which isnt anything close to what the original was, I went with Edelbrock oval ports. Being that the engines are so different, they arent really comparable, but this new mill is very responsive, and I'm sure that the oval ports contribute to that...

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    who has some good 049's for sale?

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    As Timm said, get large ovals, rectangles are way too big unless you plant to be spinning that 454 in the 7-grand ballpark, and the large ovals (like my 049's) are best served with a mild porting clean-up and the large valves mentioned above.

    My 454 had no work done 2 winters ago but mild head port/valve replacement on it's original 049's.
    Intake, cam, and exhaust had already been uprated, the heads were choking it.
    Throttle response was always excelent, is now amazing, and 400RPM was gained against the same Aggressor B impeller pump build (as I said, not a thing changed but the heads).

    I spin 5400 off the nitrous, idle at 850.

    You should be able to find used stock ones fairly cheaply, not many hundreds for the pair.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    Quote Originally Posted by franky View Post
    who has some good 049's for sale?
    Sent you a PM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  13. #11
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    Quote Originally Posted by SmokinLowriderSS View Post
    As Timm said, get large ovals, rectangles are way too big unless you plant to be spinning that 454 in the 7-grand ballpark, and the large ovals (like my 049's) are best served with a mild porting clean-up and the large valves mentioned above.

    My 454 had no work done 2 winters ago but mild head port/valve replacement on it's original 049's.
    Intake, cam, and exhaust had already been uprated, the heads were choking it.
    Throttle response was always excelent, is now amazing, and 400RPM was gained against the same Aggressor B impeller pump build (as I said, not a thing changed but the heads).

    I spin 5400 off the nitrous, idle at 850.

    You should be able to find used stock ones fairly cheaply, not many hundreds for the pair.
    Smokin...you need a new song...new engine, new boat, SOMETHING!
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member Futs's Avatar
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    Quote Originally Posted by steelcomp View Post
    Smokin...you need a new song...new engine, new boat, SOMETHING!
    Thats funny, bout spit all over my screen.....

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    Quote Originally Posted by steelcomp View Post
    Smokin...you need a new song...new engine, new boat, SOMETHING!
    yeah no shitthat ole turd he has no way in hell it turns thatjust sayin.

  16. #14
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    We have oval port head cores, and have many aftermarket heads in stock or available. We can install the bigger valves, unshroud the chambers, flowbench test, surface them and borenotch your block too. Big midrange and up gains! I am in Havasu at least once a month too. We can pickup and deliver your boat for you from Avondale/Havasu. Next trip will be next weekend. TIMINATOR 623-877-8553
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

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