How much HP from SBM ProComps? Well... 670HP!

Small Block Mopar Engine

  1. MRL Performance

    MRL Performance Well-Known Member

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    Ok, so I have been using these ProComp SBM heads for about 1 1/2 years now. I think I got a pretty good handle on them. As with any head or part, they could use a bit of massaging to make them work real good. So here is our latest attempt. Im going out on a limb here and going to claim the MOST POWER MADE TO DATE WITH THESE HEADS, N/A NO FORCED INDUCTION, NO NOS!

    This is a re-do from an engine we built last year. Customer wanted more power so we pushed it up a bit. here is the run down.

    360 magnum R block
    4.060 bore
    3.825 stroke
    6.250 rod
    From the top down.........
    1050 Dominator
    Super Victor, ported in house
    T&D roller rockers
    Procomp heads, flowing 312/230
    Custom Ractec flat top pistons 12.2 to 1
    Custom Lunati roller cam, sorry no specs. I can tell you high 270's and mid .600's
    MRL Pro PLUS soild roller lifters
    3/8 pushrods
    PEP I beam rods
    HP bearings
    Billet timing set w/tensioner
    Mallory 32 series dist 34* total
    Custom made wires Champion plugs
    Kevko oil pan
    Melling HV oil pump
    Bla bla bla

    Now for the fun stuff.

    Torque, its whats for dinner. It peaked at 564TQ at 5400rpm. But it had 530 from 4600-6650. Hell at 7200 it still had 475TQ!!!!!

    HP, its what kills the Chevys. Peak was 670HP 6550rpm. It made 600+ from 5600rpm on up. Still making 650HP at 7200rpm.

    BSFC was .395-.459 the entire run and still had a A/F ratio of 11.3-11.9. I wanted to tune more but ran out of dyno time. Valve lash was best at .025I .026E. Ran a 2" tapered spacer fro the Dominator.

    So there you have it 670HP with a 396ci SBM and those damn ProComp heads. BTW they are out of stock and will not have any until November.
     
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    • EL5DEMON340

      EL5DEMON340 Well-Known Member

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      Is all the massaging available with a CNC program? What's the total $$$ to set them up for the max HP?
       
    • MRL Performance

      MRL Performance Well-Known Member

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      It's all hand work. Won't know on price for a set until they get them back in stock. I have been told there will be a price increase, but they are still less expensive than RPM. Fully done up RPM heads ready to go with roller springs are $3000 or more. Procomps from us will be a lot less than that.
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      Stout little small block. Nice job.
       
    • rumblefish360

      rumblefish360 so close yet so far away

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      I hope you send that update to the magazines!
       
    • 67Dart273

      67Dart273 Well-Known Member

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      !! DAMN !! I'd line to be able to afford one of those.

      Naw, I' juz' git maself in trouble.

      foghorn_leghorn.jpg
       
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      • rumblefish360

        rumblefish360 so close yet so far away

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        Pfsssst! If I had the money...... Well, I'd be I'd Line by now!
         
      • Abodybomber

        Abodybomber Breaking street machines , since 1983.....:) Legendary Member

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        Stout numbers for a LA style head,impressive.
         
      • OldmanRick

        OldmanRick Well-Known Member

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        Nice one!!! 1.7 x cubes with PC heads, and at a midland rpm.......Yep, i'd say you did good! :D
         
      • WRB426

        WRB426 Insane 4 Mopars FABO Gold Member

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        Another impressive job!!
         
      • demon428

        demon428 Well-Known Member

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        Nice job Mike. Looking forward to receiving my heads from you next week
         
      • clinteg

        clinteg Well-Known Member

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        OK I'm impressed!
         
      • jerry6

        jerry6 Banned

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        Impressive for an LA small block , close to 700 hp is unreal .
         
      • Valvebounce

        Valvebounce Well-Known Member

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        Those are some pretty sharp numbers.
        Out of stock probably means more have to be cast.
        Lets hope they don't try to cut corners, save money, or suffer brain fade and wind up with a run of heads which aren't fit for purpose like the batch of crosswinds doing the rounds.........
         
      • frosty_the_punk

        frosty_the_punk Well-Known Member

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        Very impressive numbers!

        Wide lobe separation?
         
      • Ironmike

        Ironmike Well-Known Member

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        NOVEMBER! ........ah crap.
         
      • ou812

        ou812 Well-Known Member

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        lol!
         
      • mshred

        mshred The Green Manalishi

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        This engine going in to a drag car? Will we get to hear 1/4 mile times to back up the hp claims? Seems like it should be a stout combo in the right chassis setup.
         
      • txstang84

        txstang84 Well-Known Member

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        Awesome build Mike-I'd also like to see this thing screaming down the 1320 in a properly set up chassis.
         
      • drugster

        drugster Well-Known Member

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        How much for a complete set of a similar cylinder heads?
         
      • shobes

        shobes Well-Known Member

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        The 396 is my engine. Finally got all the piddly stuff I needed to complete finished, and I got my car to the track over the weekend.

        1975 Duster ~3500# with me in it. hemi 4 speed Liberty proshifted gears, Dana w/ 4.30 gears, 28 x 9 slicks 12.25#, drag shocks, comp eng slide a links

        Sat 15-30 MPH crosswind, not ideal day for testing, no complete passes outta 4, had to lift
        Sun calm perfect day, 1st pass quicker than Sat best, made 3 more and got better from there.

        Last pass of season finally launched her at a higher RPM after creeping up on it all weekend, appx 5500rpm. (wired two step to line loc, doesn't do me favors for burnout, so I didn't use it gonna add another switch)

        Shift light 6800, I believe traps was about 6400.

        60' 1.584 330' 4.618 1/8 7.144 mph 97.86 1000' 9.319 1/4 11.158 mph 122.86

        She has more in her with a higher RPM launch and a good track plus monkeying with air pressure etc. First time I ever launched a 4 speed at the track where it basically didn't bog, had the deer in the headlights thing going when the shift light came on so quick for 1-2 shift. Perfect shifts/shift points along with 7100-7200 shift light and better 60' time should get me in the 10's. Maybe need 4.56 or 4.88 gears just too early to know, it may be ok with 4.30's? Just ran outta time this weekend with the track being so jammed, and the season is now over.

        I've run 15 passes in a 10 second car before, but with an Automatic, old school stick is a real handful but a fun handful at that !! Fun weekend !:burnout:
         
      • 70aarcuda

        70aarcuda Master Hoader of SBM FABO Gold Member

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        with 9 x 28 tires...I would not go more then 4.56 gears...

        you 60 fts are not very good....but the mph shows you should run in the 10.70s....

        and with 670 HP....you would expect more mph in the traps....

        but ....you went down the track...and nothing broke which is always the good thing...

        it takes time to sort out a new combo...
         
      • Mad Dart

        Mad Dart Nothing to see Here!

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      • shobes

        shobes Well-Known Member

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        I agree 1000% that I got down the track and didn't break anything that right there was a huge win for me. There were a half dozen racers who were not as lucky some parts breakage or not lifting and kissing the wall.

        Wished I had taken time out to weigh the car since I'm just somewhat guessing, but it was a zoo at the track, and it would have been a pain. key piece of the puzzle, guess I'll check it in spring, I will be interested to find out.

        all advice and input will be noted/and or appreciated, i'm still fairly early in the testing stage 8 passes with 4 of them having to lift due to wind isn't much data. Will still be sorting out things for many passes to come, not too mention making sure I drive(shift) near perfect.

        (not sure if I should switch and start a thread elsewhere, perhaps 11 second combo area ????)
         
      • shobes

        shobes Well-Known Member

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        Well since all the discussion was lost, I'll post the pics of car launching and also at rest.

        Please give me your thoughts.
         

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