Free BBC Heads, but I got questions. What should I do?
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Free BBC Heads, but I got questions. What should I do?

  1. #1
    Half a bubble off jrork's Avatar
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    Default Free BBC Heads, but I got questions. What should I do?

    Hey guys,
    I was just given a pair of BBC Rect. port heads from a buddy and have a couple questions now that I have them.

    The head numbers are 6272990 and 14096188. Mortec lists one at 118cc's and one at 116cc's. Assuming I decide to run these, how big of an issue is this? I would assume that these are just the starting numbers for the volume and depending on how the valves are set the number may go up or down anyhow, so, should I be worried about this variance in chamber volume?

    The other question surrounds the fact that one of the exhaust seats is loose. I assume this is fixable but thought I'd run it by you. Obviously, these heads if I choose to run them will need a complete runthrough. Are they worth the trouble??

    Motor is a modest 468" with an 8-71 setting on top of some 049 heads. I'm not looking to set the world on fire with this motor but am curious if these might be worth throwing some money into them for my motor. As is, I've got no money into them so no loss if you say no....

    Thanks a bunch guys.........john
    Last edited by jrork; 04-25-2008 at 06:31 AM.

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  3. #2
    Some guy obnoxious001's Avatar
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    I think you may have a 990 head, not an 890? The 188 casting was the GM replacement for the 990 if I am not wrong, but was not really aware of a different chamber size that Mortec shows. I would suggest finding a good (emphasis on the word "good") machine shop and get their opinion of what you have, should cost little to nothing to have them look at them unless you get into cleaning and magging the castings. It's possible a shop might have one or the other casting number to swap with you also. Make sure they are aware of your intended blown marine usage, and that they are comfortable that whatever work they do will be suitable and not have a seat fall out or something that would not make you happy.

    PS.. if you do get a free estimate, then ask them to mag the heads before they do any further work, maybe even pressure test them so you don't throw a bunch of money into them only to find a problem later. I have seen plenty of 990 heads with cracks.

  4. #3
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    Default Bang for the buck

    Regardless of the equality of these heads, the mere fact you gotta spend some money relates to bang for the buck. You're running oval ports with a blower? Which blower intake? I've never seen a blower intake for oval ports. Kinda of a misnomer......... Bang for the buck, you'd be better off buying some out of the box Aluminum heads, ready to rock and roll under your blower. Blowers are funny, they don't care whats under them, they're gonna push some air, but pushing air into an oval port set up is kinda really relying on the push part. Then you have to look at the quality of the valves being pushed.....Bottom line, get the aftermarket stuff, save some $$$$$ in the long run and have a better finished product........Just my .02.............MP

    049s are oval ports, right?? Or is that the closed chamber rec port?..........Either way, look into aftermarket aluminum stuff before you spend a dime on those heads..........
    Last edited by Moneypit; 04-25-2008 at 02:29 AM.
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  6. #4
    Half a bubble off jrork's Avatar
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    My bad, yup, it's a 990. I'll have the machine shop look them over and mag/pressure test them and see if they're of any value and then decide cost to refurbish versus purchase of aftermarket heads.

    Thanks very much for the advice

  7. #5
    Senior Member H20MOFO's Avatar
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    When I blew my 990's up I was told by all they were discontinued? If you don't want them I'll take em
    Another Hot Boat refugee

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    Distinguished Member David 519's Avatar
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    The guy that was on the dyno just before us had a basic iron 468 with cleaned up 990's on alky with a 10-71. I saw the dyno results, he made over 1100 hp. If the heads are not cracked, I wouldn't hesitate to recondition and use them, especially in a blown deal. Good luck...

  9. #7
    Half a bubble off jrork's Avatar
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    Quote Originally Posted by David 519 View Post
    The guy that was on the dyno just before us had a basic iron 468 with cleaned up 990's on alky with a 10-71. I saw the dyno results, he made over 1100 hp. If the heads are not cracked, I wouldn't hesitate to recondition and use them, especially in a blown deal. Good luck...
    Thanks David. I'm not looking to make 1000 hp, hell I'd be thrilled if I can get a good 700 hp and frankly, would be happy if I'm in the 600's. This thing is more of a motorized airmattress anyhow.......

  10. #8
    steelcomp was here
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    There's been some serious power made through 990's under a blower. Don't hesitate for a minute to use them. The biggest difference you'll see with aluminum heads will be weight, and a better ex port, which can be dealt with with a good cam grind. the advice to have them checked out and then gone through is good advice. For the price, you can't go wrong. If you want to spend a few $$, have 2.25 intakes installed with a good 4 or 5 angle valve job, and do some port work to the exhaust with a good radiused seat. They'll work just fine. Even left alone, they'll be a huge improvement over the ovals. If you were closer, I'd say bring 'em by.
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    Half a bubble off jrork's Avatar
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    Hey Scott, I really appreciate the response and figure it's about time for you to take a trip north isn't it? Hell, we can offer cool temps, plenty of water to boat in (even in the Safeway parking lots) and when it comes right down to it, certain times of the year you don't even need a boat launch Just launch it in your garage and run it right out the driveway........

    Thanks for the input. I wish you were closer but since you're not, I hoping that one of the number of good shops up here that can probably help me out, PED, Dale Green, Ed Trihey ect...
    I may pester you and the others though to make sure I understand what I'm getting into...

    By the way, what's the status of the "upcoming project"? Git r done.....john

  12. #10
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Yes MP, the '049 is the open chamber large oval port, GM replacement for the '781 casting, same specs.

    I have 049's on my 454.
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