Spx vrs sp2

Discussion in 'Race 400/430/455' started by Bens99gtp, Dec 11, 2017.

  1. Bens99gtp

    Bens99gtp Well-Known Member

    Just wondering the pros and cons for both intakes on a ported set of TE2 heads.

    Besides the simple fact that that sp2 is direct bolt on and Spx isnt. I read a lot of ppl using the Spx over the sp2 just wondering why.
     
  2. hugger

    hugger Well-Known Member

    Fuel distribution is better along with cooler charge, but SP2's have been 8's so,...if I was going to go thru the trouble of getting an SPX on there I'd probably just go with the Mopar super Vic or the like,
     
  3. Bens99gtp

    Bens99gtp Well-Known Member

    I have a sp2 on my combo......not planning on changing.....just wondering why go through all the hassel.......must be worth a decent amount of gain to go through the work
     
  4. hugger

    hugger Well-Known Member

    On a high rpm setup there is gains to be had, it's a better looking intake for sure. The new spacers from Rob at Precision Billet, make it a Bolton deal $285 iirc, Chris Skaling and Rob worked together on making them available for us
     
  5. Bens99gtp

    Bens99gtp Well-Known Member

    That's good to know, no intentions on changing yet........but nice to know it's bolt on now
     
  6. hugger

    hugger Well-Known Member

    Raises it 5/8in to facilitate a smooth transition
     
  7. hugger

    hugger Well-Known Member

    I asked Mike one time how hard it would be to retool for a TE version, the TE head needs a better intake, it only makes sense to make the race intake fit the race head, but there are more SE heads than TE heads so,...
     
  8. Bens99gtp

    Bens99gtp Well-Known Member

    Assuming with the adapter it used the te2 gaskets between the heads and spacer than mopar gaskets between spacer and mopar intake
     
  9. Bens99gtp

    Bens99gtp Well-Known Member

    Which Intake Is Used Is It The One For The Standard Heads OR The One For The Max wedge
     
  10. Bens99gtp

    Bens99gtp Well-Known Member

    Be interesting to see if anyone has done a dyno test comparing the sp2 to the spx or mopar intake
     
  11. hugger

    hugger Well-Known Member

    383/400 for SE ports
    440 for TE ports

    But when I tried to do this back last year, I didn't like the port alignment I know it's been done to death, but time all the welding,blending and what have you is done I decided to just go custom

    I'm sure Kubish and JW have some concrete dyno comparisons.
     
  12. Bens99gtp

    Bens99gtp Well-Known Member

    Thanks I will wait for the to chime in if not I will call Gary and talk to him
     
  13. Jim Weise

    Jim Weise 1000+HP

    The answer to your question is volume.

    The SPX and various Mopar manifolds have more plenum and runner volume, for the big inch, high rpm combos. You can nearly get an SP-2 to the volume of an out of the box SPX, but the SP-2 will be paper thin. And all that intake porting work sucks to do.

    Big cubic inch combos need larger intake tract volume to support HP above 750 from 6300 rpm up. E-85 makes this even more critical, as we choke out the air with 30% more fuel.

    I have seen a 730ish HP engine lose nearly 50HP from 6300 thru 7000, when using a mildly ported SP-2. I switched over to a Mopar manifold and my adapters, and we were able to maintain 830 HP on that engine, from 6300 to 7000.
     
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  14. dan zepnick

    dan zepnick Well-Known Member

    So what does it take to use a wildcat intake with ta track eliminator heads? Just adapter plates??
     
  15. hugger

    hugger Well-Known Member

    With Rob's plates it is a bolt on deal, of course you would need to blend and port match but the hard part is done
     
  16. Bens99gtp

    Bens99gtp Well-Known Member

    Wow jim, that's a big difference, so in my case with my 464 current setup, or say if someone has a 470 or 482, and the planned rpms are not really planning to go above 6500, is the sp2 with mild porting likely to start to be a resistruction? My head flowed 370/265 @ 600 and 380/269 @ 700. Current cam is 308s, have no clue what new cam in the new motor is going to be yet, but it will be a custom to hopefully take full advantage of the heads.

    On a side question knowing it can be a restriction in top end power as the rpms climb, does the spx/mopar intakes also make more usable power in the 4000 to 6500? Or are the rest ions more in the upper rpms........I'm sure cubes effect this too and the bigger the cubes the sooner it will become an issue........but in my case I won't be having a 500+ motor for awhile
     
  17. BuickGSrules

    BuickGSrules Gold Level Contributor

    Sorry for hijacking the thread, but have to ask a question. My new 494 will be crossing the line around 7-7200 rpm. It is all tricked out, will be running 13-1, 700+ lift and stg2's flowing 386 at .700. My plan was using the sp2 that is ported and the 1050 Dom I have. Would I be better off with the SPX or the mopar tunnel ram? I want to squeeze every little hp out of that motor. I have some Chevy guys to scare over here :D
     
  18. hugger

    hugger Well-Known Member

    I would be looking to get a something with more volume on that combo for sure, the SPX has alot of more room inside the plenum and the runner walls are thicker so you got material to work with for sure. The air can move faster thru the SPX vs the sp1/2 as well by its design
     
  19. Jim Weise

    Jim Weise 1000+HP

    Ben,
    Your most likely still in the effective range of a good ported SP-2. I doubt you would see much with the bigger intake, in that combo, with that CID.

    Jan,

    What is your camshaft duration at .050 lift? If it is over 270, then you should buy that Billet Tunnel Ram that Rob has for sale, that is a killer deal. For max HP, see if he can machine you a top with dual dominators. Your Rpm range and desire for max power means you need an intake upgrade, if I was ever going to run a high port TE head again, I would have already bought that intake from Rob. But I can't image running anything but the KB heads for a max effort strip only deal, those things flow what yours do at max, down around .500 lift. At .700 they are 465 cfm.

    JW
     
    Julian and BuickGSrules like this.
  20. hugger

    hugger Well-Known Member

    That intake is the deal of the year by far,.if I could make the $ happen in ANY way I would grab it
     

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