new engine combo

Mopar Performance Issues

  1. muller

    muller Well-Known Member

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    what should it do???

    360 .40 over
    kb pistons
    11.2:1
    ported & polished x-heads,5 angle valve job
    285 /545 cam
    victor intake
    750 mighty demon
    1 5/8 hedders
    mp distributor
    msd 6 digital
    roller rockers
    cloyes true roller timing set
    holley blue pump
    100 to 250 NOS


    thnx!!!
     
  2. OldVart

    OldVart Well-Known Member

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    Hey muller. Is this a strip only or street / strip car? What make, model, year of vehicle will it be in? Vehicle weight? Tranny? Rear gears? Tires? It looks like it would be a potent engine in the right vehicle, with all of the drivetrain properly matched up to it.
     
  3. mopar1962

    mopar1962 Guest

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    make sure you have proper top ring gap to run nos 0.22 good choice 2nd ring can have tighter chearances, also make sure car gets minimum 8 psi fuel pressure using the nos. and for every 50 nos shot, retart timing 2 degrees, wise to run it a tad on the rich side also.
     
  4. mopar1962

    mopar1962 Guest

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    also get a bigger set of tubes, minimum 1 3/4
     
  5. daredevil

    daredevil Well-Known Member

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    Run like a striped ape
     
  6. muller

    muller Well-Known Member

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    it's in a '75 dart sport,street/strip,8 point cage,frame connectors,drag shocks front & rear,727 with a 3500 stall,slapper bars and 275 50 15 bfg dragradials....gears i don't know yet....i think i'll go for a new set 410:1
     
  7. muller

    muller Well-Known Member

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    that's what i did,and i put molley top rings in it and cast as a second ring
    for the nos i'm gonna buy a second pump,so i can run more nos (more fuelpressure than the carb needs)
    and for the timing retard...that's why i went for the digital 6
     
  8. OldVart

    OldVart Well-Known Member

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    Ahhh, Then I'm with daredevil. It should run like a raped ape. :)
     
  9. rumblefish360

    rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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    I'm with bigger primary header tubes. Since it is a drag car, 3 inch exhaust pipe.
     
  10. blk00rt

    blk00rt Well-Known Member

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    careful with the digital six. I know a lot of guys that run them and have had the boxes go out. It seems very common with msd stuff.
     
  11. OldVart

    OldVart Well-Known Member

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    I'd get rid of the slapper bars also. Mopars really don't need them due to the shorter front spring segment compared to the other makes.
     
  12. muller

    muller Well-Known Member

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    i used to have a lot of wheel hob,after i put the slapperbars on that was gone,so i think i'll leave them on...or upgrade to caltracks
     
  13. Dartnut

    Dartnut Don't hate me because i'm beautiful

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    Well........ The 4:10 ratio would be my choice, Bar. And the cal-tracs are good too. My guess is high 10's because you lightened up the car and made it a lot stiffer. That's if you can get the traction. The cal-tracs will help it a lot. I'm an old school guy that has used SS springs and a pinion snubber with very good results in the past for street/strip applications. I don't know how the cal-tracs are on the street. What does your car weigh? my guess is 3300 lbs. if you take all of the beer cans out of the back! lol ....... You really need a 8 3/4, 489 case and mini tubs to get traction too as well as reliability. All this stuff can be transferred to your '72 swinger when you sort it out and you will be ahead of the game. Maybe you can phone our friend in Calgary and you can get this stuff for free, he obviously has contacts, lol.....and the favour would be returned. :evil4:
     
  14. mopar1962

    mopar1962 Guest

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    hi 10s using the 250 shot of nos maybe,your heads are crap, your cam is too small,
     
  15. daredevil

    daredevil Well-Known Member

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    Yep MSD stands for might suddenly die.
     
  16. dgc333

    dgc333 Well-Known Member

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    I am assuming KB hypereutectic pistons. KB has very specific requirements for ring end gap. With NOS you will need upwards of 0.030" of gap, with out the NOS it is about 0.024". Violate this and you will be rebuilding the engine again soon becasue of broken pistons. Whether they are moly coated or not is not the issue, it's the end gap. KB postions the rings closer to the top of the piston so they run hotter and need the additional gap. When the are up to temperature the gap is the same as other pistons.

    Also, hypereutectic pistons are not the best choice when running NOS. I would limit the NOS to a 100 shot. But of course if you have forged KB pistons this is not an issues.
     
  17. D-mailman

    D-mailman Well-Known Member

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    I am in agrement too...headers are too small. 1 3/4" minimum. 1 5/8" are restrictive. costing you about 7% H.P. Good luck, Terry.
     
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