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Anyone running 041 casting SBC heads?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Ryan B., May 6, 2003.

  1. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Just curious if anyone is running these heads, on what bottom end, and how ya like it...

    I'm going to be building up some 041 heads off a '69 350 to put on my 350. Basically the same as the camel hump heads but with the accessory bolt holes.
    I broke a rocker arm, and damaged the stud and valve... took off the other side head and found a crack, so i'm replacing those 76cc heads for these 041 64cc heads. /forums/images/graemlins/thumb.gif Compression should go from aproximatly 8.5 to 1 up to 9.5 to 1. /forums/images/graemlins/tongue.gif
     
  2. wrathORC

    wrathORC 1/2 ton status

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    No, but... what about hardened seats?

    I found a set of those heads at the junkyard out of a 69 1 ton once but my Dad told me chances are anything pre-73 had soft seats. I don't know if they are or not so that's why I'm asking.
     
  3. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Not sure, i'm getting new hardened seats in them and valve guides. /forums/images/graemlins/thumb.gif
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Not to be an a$$, because you didn't ask for any other advice, but have you looked into new aftermarket/GMPP heads?

    When all is said and done, a complete rebuild of older stock heads is going to put you (typically) very close to what a new set of heads will cost. And they will kick the crap out of the older heads as cast. Most of the smaller runner heads being made now are extremely efficient designs, which means more power, better economy, and more fun /forums/images/graemlins/smile.gif

    If you *haven't* looked at the costs of a complete head rebuild, consider these:

    Milling the head surface flat
    Magnufluxing
    Cleaning
    Installing hardened seats
    New springs
    New valves
    New valve guides
    New valve seals
    Valve job
    Pull/replace stock studs with screw in
    Pushrod guideplates

    All those typically put rebuilt heads into new head price territory. Not always, and you may not do everything listed above, but if I were going to swap heads, I'd go for a bit more. Vortecs aren't your only (nor likely your best) choice, since they would require a new intake. Other aftermarket "fast burn" style heads can usually be had so you can re-use your old intake.

    Just an idea, if you hadn't considered it. /forums/images/graemlins/smile.gif
     
  5. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Yeah i've thought about that as well. Thanks for kickin around other ideas, getting me thinkin some more.
    Buying new vortech heads and intake didn't appeal to me a whole lot.
    I'd rather run some good old heads or go all out with some Air Flow Research heads.. I'm going with the cheaper of the two this time around.
     
  6. 88Silverado

    88Silverado 1/2 ton status

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    The 041's are a good head.
    Im running small valve 186's off a 70 Vette which I got from my friend for $50. They had hardened seats, heavy springs and ported exhaust. Cost me $200 to have them rebuilt with new guides and all new exhaust valves. I have them on my .030 over 350 using flat-tops, Comp xe-262cam and performer manifold and 600 CFM carb. I can pull 6500 RPM's consistantly with this setup. If the heads didnt breath, I couldnt do this /forums/images/graemlins/thumb.gif

    The Vortec heads are good but after you get the special manifold and replace the valve springs and studs (if you plan on running anything over .460 lift) and the self aligning rockers, your into some $$ plus the Vortec's are a thin casting and I have seen them crack. The next step up is the S/R Torquer or Sportsman but now your in the $600+ range.

    Heres a link to my car page with the details on my engine:
    http://home1.gte.net/res096qi/71Elky.htm

    Heres some links on camelhump etc:
    http://www.classictruckshop.com/gmcastingmarks.htm
    http://www.geocities.com/MotorCity/Speedway/5117/flow/
    http://www.jimsperformance.com/headchart.html
    http://www.topher.net/~bearman/gmheadcomp.html
    http://www.chevytalk.com/tech/engine/SBC_Heads.html
     

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