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  1. #1
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    Default Single plane intake on 308

    Hi I have just had a 308 built for my hq it has a slightly bigger cam and has the head ports smoothed out besides that it's pretty much stock I had a redline maxitork singleplane sitting around so I gave it to my engine builder to have it fitted instead of the stock manifold he told me it would be better than the stock one is this the case or should I be running the stock duel plane instead

  2. #2
    casual poster JaseQ314's Avatar
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    I've just shot out and grabbed a packet of popcorn .

  3. #3
    Do you ever leave? EH179's Avatar
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    The best person to answer this is yourself.
    Try it and see if you're happy.

    As Jase has blatantly displayed these sort of questions usually end in a sh#t fight

  4. #4
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    Quote Originally Posted by JaseQ314 View Post
    I've just shot out and grabbed a packet of popcorn .
    Bwhahahaha Yep.... Come in Pauly...

    Letís be honest though, a rebuilt 308 (sounds like slightly better than standard engine) with a small cam (what size?) and cleaned up heads (how much compression?) would be fine with a decent dual plane intake and well sorted quadie (or Holley if thatís what you already have?) for street duties.

    But in saying that Iíll warm up some popcorn and settle in.

  5. #5
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Dazz 77 View Post
    Hi I have just had a 308 built for my hq it has a slightly bigger cam and has the head ports smoothed out besides that it's pretty much stock I had a redline maxitork singleplane sitting around so I gave it to my engine builder to have it fitted instead of the stock manifold he told me it would be better than the stock one is this the case or should I be running the stock duel plane instead
    a Performer or GMH HDT V5H '5955' manifold will work far better on that engine as you describe it ... than the single plane Maxitork
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  6. #6
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    ^^^ Yep, the brock/cop manifold or a performer will work the best.

  7. #7
    Sure why not? 76lxhatch's Avatar
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    The original pre-pollution factory manifold (which it should be if original HQ) is fine too. Single vs dual plane arguments aside the Maxitork isn't really a good example, its designed to fit under the bonnet and not much else.

  8. #8
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by 46Crab View Post
    Bwhahahaha Yep.... Come in Pauly...

    Nah... It only costs some gaskets, silicone and time to try the single plane... People blame the single plane for everything, they dont blame the stock stall or 3.0 rear gear, low compression or an antiquated tractor cam with seat duration from here to the moon...

  9. #9
    Not the Kingswood! hq308's Avatar
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    It probably wonít make a big difference one way or another. The single plane will look better, so like Paul said give it a try.

  10. #10
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by paulzig View Post
    Nah... It only costs some gaskets, silicone and time to try the single plane... People blame the single plane for everything, they dont blame the stock stall or 3.0 rear gear, low compression or an antiquated tractor cam with seat duration from here to the moon...
    don't forget to drain all the coolant too...
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  11. #11
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Smitty2 View Post
    don't forget to drain all the coolant too...
    Water is cheap enough...

  12. #12
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by paulzig View Post
    Water is cheap enough...
    Nearly as expensive as beer around these parts...

  13. #13
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    Thanks for all the info everyone I think I'm going to keep the single plane on at the moment and see how it goes

  14. #14
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    I'm not sure about the cam size the bloke told me it was only a little bit bigger than stock as for compression I'm not to sure and I'm running a quadrajet that's been totally rebuilt I put the single plane on because I brought a 1 tonner for parts and it had that on it and it looked better than the stock one I just figured a aftermarket one would be designed for better performance

  15. #15
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    On your engine the single plane might net you a bit of power at max rpm. But if you want low/mid rpm driveability then the dual is the go. My old warmed up 308 gained .15 secs on the 1/4 mile for a best of 12.9 with a torker single. But it was a better street car with the performer dual plane.

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