This a good deal ?
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2004-2007 Cadillac CTS-V Performance Mods Discussion, This a good deal ? in Cadillac CTS-V Series Forum - 2004 - 2007; Selling the heads / cam out of my ls swapped mustang. The heads are new gm 799's (3000 km on ...
  1. #1
    stepchild21's Avatar
    stepchild21 is offline Cadillac Owners Fanatic
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    This a good deal ?

    Selling the heads / cam out of my ls swapped mustang.

    The heads are new gm 799's (3000 km on them) they are milled .030 They have new yellow springs aswell. (compression is 11:1 on an LQ4)

    Delta cam , specs are : 224/230 @ .050 .580lift on a 112 c/l

    Also including new 43lb injectors.

    This combo made 430 whp on a LQ4 with 93 oct.

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  3. #2
    stepchild21's Avatar
    stepchild21 is offline Cadillac Owners Fanatic
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    A guy is sells this locally and I'm looking at installing this on my ls6. He's asking 1000$ with lifters.

    Opinions please

  4. #3
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: This a good deal ?

    Your existing heads are better than the 799s. The castings are the same design, but you 243s have light wieght valves (hollow intake valvesand sodium filled exhaust valve.) The cost of having yours milled is not high, but you should verify the compression ratio and determine the probable piston-to-valve clearances before having them milled.

    The cam and lifters sounds ordinary. The injectors may be worth looking at.

    Overall, you don't need the most expensive parts (the heads) so the value of the package to an LS6 is far less than the $1,000.

  5. #4
    howanicm is offline Cadillac Owners Fanatic
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    Quote Originally Posted by darkman View Post
    Your existing heads are better than the 799s. The castings are the same design, but you 243s have light wieght valves (hollow intake valvesand sodium filled exhaust valve.) The cost of having yours milled is not high, but you should verify the compression ratio and determine the probable piston-to-valve clearances before having them milled.

    The cam and lifters sounds ordinary. The injectors may be worth looking at.

    Overall, you don't need the most expensive parts (the heads) so the value of the package to an LS6 is far less than the $1,000.
    Do you know the minimum combustion chamber size our ls6 can have before you have valve/piston collision?

  6. #5
    darkman's Avatar
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    Re: This a good deal ?

    Quote Originally Posted by howanicm View Post
    Do you know the minimum combustion chamber size our ls6 can have before you have valve/piston collision?
    The answer to that depends a lot the camshaft selection. With a stock cam you would probably limit how much you milled the stock heads based on compression ratio considerations and/or quench. I think the generally accepted maximum is 0.035 inches, which should reduce the combustion chamber by almost 6cc. If I recall correctly stock is 64cc.

    My Trickflow 215s come with 64cc chambers, which I had milled by 0.015 inch or a 61.5 cc chamber. This increased the compression to 11 to 1. My cam was mild so piston to valve clearance was not an issue. Since my cam reduced dynamic compression I have no problem with 93 octane fuel.

    On a stock engine with a stock cam milling the heads could create a fuel octane requirement above 93 since the dynamic compression ratio is not being "mitigated" with a bigger (than stock cam).

  7. #6
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    Okay so what would you recommend I do ?

    I'm new to cams and all this.

    Can I keep my existing heads and just do a cam shaft ??

  8. #7
    darkman's Avatar
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    Re: This a good deal ?

    Quote Originally Posted by stepchild21 View Post
    Okay so what would you recommend I do ?

    I'm new to cams and all this.

    Can I keep my existing heads and just do a cam shaft ??
    Yes, you can keep your existing heads and just do a camshaft. The camshaft change does however, necessitate some associated upgrades in hardware. Specifcally, with almost any aftermarket camshaft you should upgrade the valve springs, pushrods, and timing chain. Many choose to upgrade the oil pump at the same time because there is a lot of overlap in the process of a cam change and an oil pump change.

    Changing the camshaft does not necessarily require you to pull the heads or change the lifters. (If you have more than 60k miles on the car, you consider replacing the lifters, which requies pulling the heads.)

    As far a cam recommendation goes, I would either get a custom recommendation from a cam specialist like PatrickG, or talk to people like Geoff Skinner at Engine Power Systems, Mike Schmidt at Total Engine Airflow, or Tony Mamo at Air Flow Research. These folks can also steer you in the right direction and/or supply the companion parts.

  9. #8
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    Okay thank you very much for the advice, this Has helped me alot and definitly just saved me a 1000$ !!!

    I'll give one of these gentleman a call in the next bit and see what they recommend. Definitly glad I can run my old heads. This is just something I would like to do while the car is parked over the winter.

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