049 heads
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049 heads

  1. #1
    Cole SS cole ss's Avatar
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    Default 049 heads

    I have a 1990 454 in my boat. It has the peanut port heads. I don't have the funds to do a rebuilt short block and cam change. Short block is in great shape. Would changing heads to 049 be worth the change? I would put in the larger valves, and I can do a mild port and blend job myself. Because of clearance I can't use a performer rpm intake. All I can seem to find is a single plane torker to fit. I know not the best choice. What else would work? I don't want to modify my deck. I can maybe change to a 2" tall arrester, but what about air flow. thanks

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  3. #2
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    you will love the change to those heads and do go to the larger valves also
    i would try and use the performer rpm man and maybe use a k/n marine filter setup should be some dimensions on there website. small flame arresters just dont flow well up top in rpm. also there are rotator cup eliminator kits for the exh spring seats thru comp cams if you need them.

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    u might look into the Performer RPM Air Gap manifold...i think its not too tall & also, its a dual plane which will give u good torque & mid-range...alot of peeps run it ...works good with the 049 heads...just my .02 cents

    FastRat

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    Sit N' Spin Jetaholic's Avatar
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    On a 9.5:1 motor I ran the RPM Air Gap with Holley 750dp, the 049s and rec port valves. With an Isky 280H Mega cam it spun an American Turbine AB impeller to 5400 RPM easy. That got my little 18 footer up to 79 with only a droop and a loader.

    Mine didn't live very long but that was due to having the wrong pistons for the valve combo, among various other factors not related to the top end combo.

    And that brings me to another subject...if you plan on 049s with the bigger valves and pop-up pistons, REGARDLESS OF WHAT CAM YOU RUN, MAKE SURE YOU CHECK YOUR VALVE-PISTON CLEARANCE!!!

    X2 on the exhaust seat rotator eliminators.

    Aside from that, the RPM Air Gap with the 049 heads is a VERY common jet boat combo and IMHO doing a top end re-power will yield some gains. Just watch your tach...it will tell ya how much difference it made.



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    Cole SS cole ss's Avatar
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    Good idea on valve clearance. Why rotator cups?

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    steelcomp was here
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    Quote Originally Posted by cole ss View Post
    Good idea on valve clearance. Why rotator cups?
    I don't think the 049's need the rotators, but the 781's do. The 781's are basically the smae casting.
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by FastRat View Post
    u might look into the Performer RPM Air Gap manifold...i think its not too tall & also, its a dual plane which will give u good torque & mid-range...alot of peeps run it ...works good with the 049 heads...just my .02 cents

    FastRat
    It's roughly 2" taller an intake, compared to stock Chevy dual-plane iron, so if clearance is already very tight, it's gonna be a buster.

    Great intake, love mine, I had enough room that the 2" didn't make it a deal-killer.

    Need a better breather than a 2" tall spark arrestor, that'll cramp a 454 something firerce trying to make, or break, 5-grand.

    I run a very similar setup to Jetaholics, less compression, and a kick of Nitrous on top.

    Had my original '049's ported, and the 2.19" and 1.80" (1.88's trimmed down) valves installed, incredible change.
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by cole ss View Post
    Good idea on valve clearance. Why rotator cups?
    I think the rotators original purpose was to prevent deposit build up on/between the valve seating surfaces.

    Put the eliminators on my heads when the valve work was done, certainly no problems.
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    Sit N' Spin Jetaholic's Avatar
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    As steelcomp said, exhaust valve rotators are not needed on 049s. However, without the rotator eliminator in place, the spring seat will be too deep. So the rotator eliminator is basically a thick shim that is pressed in place of the rotator, giving you a standard installed height.



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    Senior Member CK7684's Avatar
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    Can you put o just a Edelbrock Performer manifold?? I dont see why it wouldnt work for such a mild combo, and it would sit much lower. It's got to be comparable to the GM aluminum intake that came stock on my engine, and that made pretty good power...

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by CK7684 View Post
    Can you put o just a Edelbrock Performer manifold?? I dont see why it wouldnt work for such a mild combo, and it would sit much lower. It's got to be comparable to the GM aluminum intake that came stock on my engine, and that made pretty good power...
    I think so, it just won't be, IMO, as good above 4500RPM as the air gap.

    Should certainly be better than the iron mine came with.

    The air gap, according to Edelbrock's claims, sits taller to somewhat straighten the corners that are otherwise pretty square turns on a normal, flat, cross-H dual-plane manifold.

    If you have to go Performer, IMO go Performer RPM, or grind out the same roughly 1x2 opening in the divider (only difference in the "RPM").
    Again, according to Edelbrock, this permits some "sharing" of sides at elevated RPM, the same sharing that is constant in a single plane manifold. THis supposedly helps improve the breathing of the dual-plane without sacrificing the runner velocity that makes dual-planes such torque builders.

    I run a Performer RPM Air Gap and a 14" wide K&N Filter setup to almost 6-grand (5400 w/o nitrous). Throttle response is great, starting is easy, towing skiiers and tubes is Lowrider's main gravy under 4-grand and I couldn't want a better working combination.

    I'm not swearing Edelbrock's claims are true, use them as you see fit, they are their claims, I have no way to prove or disprove them, just passing them on as information for the decisions.
    Last edited by SmokinLowriderSS; 08-22-2009 at 05:58 PM. Reason: addition
    "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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    The Weiand Stealth is a good manifold on the 049 or 781 heads just my .02 cents. Clay Smith cams says so as well FWIW.

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    Cole SS cole ss's Avatar
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    My stock heigth A+B is 3.875". Torker is the same. RPM is 5.25. I will look at stealth.

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    Quote Originally Posted by cole ss View Post
    My stock heigth A+B is 3.875". Torker is the same. RPM is 5.25. I will look at stealth.
    Yea, if you have to stay that low, the Perf.'s aren't gonna work.

    Carb base pad A-B measurements.
    Perf: 4.85
    Perf RPM: 5.225
    Per. RPM Air Gap: Same, 5.225

    Good luck to ya cole, the Torker wouldn't treat you bad if you run one IMO.

    I'm suirprised the RPM was taller, and the Air Gap wasn't. Never looked these figures up before tho, learn somethin. new every day.
    "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."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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