Post your 12 second small block combos

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  1. rmchrgr

    rmchrgr Skate And Destroy

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    Just doing a little internet bench racing here. I'm sorting out a 340 on paper using the old "How To Hot Rod Small Block Mopars" tables in the back of the book. I want to get into the 12's. The tables are basically saying use a TQ or Holley 7-850, headers, (duh) Holley Strip Dominator/M1, the MP .528 solid cam and an electronic distributor.

    I'm curious though as to how you got into the 12's with your small block A-body. Looking for non-stroker stuff here - 3.31" arm only.

    Please list engine specs like cam, compression, head choice, ported or not, valve size, carb, pistons etc., chassis/trans/driveline, tire size, weight of the car if you know it and any other pertinent info.

    Pics are good too!
     
  2. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    From around the track, I met alot of guys running the MP short block. They ran the 10-1 version with the purple 292/.509 cam. Most had Edelbrock heads and ethier a RPM or a M1 MoPar intake with decent sized headers, 1-3/4. Gears ran between 3.90's and 4.30's.

    I don't know what stall they ran or there cars weight. It varried alot. Some full street cars and some fully gutted and caged.

    This should be interesting to see who's done what with what.
     
  3. 340Dart

    340Dart FABO Gold Member FABO Gold Member

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    This was the first combo I had in the Dart. 340 .030, KB pistons, balanced rotating assembly, GK 507 hyd. cam, stock heads with 3 angle valve job, Holley Strip Dominator intake with 750 Holley DP, MSD ingnition and TTI headers. With a 4 speed trans and 4.10 Dana 60 it went 12.76 @ 108.43. Car was 3400 with me in it.

    Fred B
     
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    • abodyjoe

      abodyjoe Well-Known Member

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      mine went a best of 12.17 at 108.9mph

      mp 360 9.5to1 short block
      mp 508 purple cam
      out of the box eddy heads( closed chamber #6077)
      tti headers
      performer rpm intake
      proform 750 dp carb
      dynamic 9 1/2" converter
      904 ( full automatic)
      3.91 gear
      26x9.5 hoosier qtp tires

      launched at 3000 rpm
      shifter at 5900 and went through the traps between 5900-6000 rpm
       
    • rmchrgr

      rmchrgr Skate And Destroy

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      Cool, keep them coming guys.

      Also should have asked how high you revved it? Anyone run their 'street' car (read- no trailer) over 6,500?
       
    • perfacar

      perfacar Well-Known Member

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      1972 340 duster w/ 4 speed trans, stk comp ratio, 1.88/1.60 valves, stk intake & T.Q., 3 angle stk heads, 1 7/8 headers, 5.13 , 29.5 tires, hyd cam, l.t. rings, 11.75 @ 113 , 3450 wgt. no nos!!!
       
    • scampman416

      scampman416 Well-Known Member

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      my 360 eng 410hp to the tires.JPG

      My Combo I was running in my 71 scamp,

      360 eng, stock Crank, KB pistons 10,7-1 , eagles H beam rods, Edelbrock heads out of the box, crane roller rockers, Comp solid flat tappet 555 lift, Digital 6 MSD box and dist, Wiend dual tunnel Ram and 2# AFB comp sers carbs 500s . Car #s 3000 lbs me in it, 4 spd with the 833 trans pro shifted by liberty. 4.88 gears, w 28 x 10.5 slicks. Best run 11.50 @ 119 mph 1.60 60 foot, 1/8th 7.45 ,Eng dynode at 407 hp and 401 fpt at rear wheels.

      It was a great combo may have ran faster with single Carb set up but I loved my duals. I am now building a R3 59 deg block trying to get into the 9s with the 4 spd car. If not I have a 250 Nos plate on it as well, that oda do it.

      my 360 eng 410hp to the tires.JPG
       
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      • scampman416

        scampman416 Well-Known Member

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        PS I had the rev limiter set at 7300, shift light at 6800 rpm, and it never failed I always bounced off the limiter on the 1-2 shift.
         
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        WOW! good job.

        What is;

        l.t. rings & what cam?
         
      • crackedback

        crackedback FABO Gold Member FABO Gold Member

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        Where in the 12's you want to run? Top side, 10-10.5:1, xe268H, LD340/RPM/Air Gap, 750dp preferably an HP, iron J/O/U heads with mild clean up, stock/HD rockers, headers, 3500-3800 converter, 4.10-4.30 gears, 28x9 tire.

        Make it hook and it will run 104-106 and high 12's.

        Want to go faster, put a bigger cam in it and possibly step up the converter and heads.
         
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        • perfacar

          perfacar Well-Known Member

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          hi, rings are not cast , run of the mill type!! cam has .465 lift. 273 rockers too.
           
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          • stroked 340

            stroked 340 Banned

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            '77 360 block
            stock stroke crank 10/10
            eagle rods
            speed pro flat tops
            Lunati .533/.552 hyd. cam
            Edelbrock heads w/slight port/polish
            Comp cam roller rockers
            Air gap intake(port matched,center divider milled down)
            Quick fuel 850...this combo runs high 11's with a best of 11.86 in a "street" car..NO sprayed needed:-D:-D
             
          • stroked 340

            stroked 340 Banned

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            408stroker,he's looking for stock stroke combos...you guys ot that dart in the 10.80's thats awsume:cheers::cheers:
             
          • stroked 340

            stroked 340 Banned

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            My duster is a street car..but i trailer it to the track,just incase something breaks(you never know)..i shift the 360 at 6200rpm's....
             
          • racerbob

            racerbob Well-Known Member

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            1971 340 .030" over 10-1 forged pistons, stock rods & crank, .509" MP hyd cam & lifters , MP double valve springs, 915 J heads with 2.02 intake 1.6 exhaust valves, Wieand single plane intake manifold, Holley 650 cfm double pumper (list 4777-6) carb, hooker competition headers (1 5/8" diameter tubes) through 3" dynamax bullet mufflers, electric water pump drive, electric fuel pump

            3600 rpm stall turbo-action converter , 727 trans, 4.10 rear, 26/8.5X15 MT ET Drag SLicks, Compettion engineering drag racing shocks on all four corners, stock 340 suspension in front (with sway bar and disc brakes) , MP SS springs (3000 lb) in rear, MP subframe connectors (bolt -in)

            in a 1973 dart sport, car weighs 3340 with me in it.

            11.92 @ 111.92 mph in the cool aior last November, low to mid 12's all summer long

            Some people have told me my carb was too small, but every time I have tried a larger one the car slows down??
             
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            • moper

              moper FABO Gold Member FABO Gold Member

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              1968 340, std bore, bought disassembled for $350 in 1989. No measuring anything. Bought stock rings, stock bearings, HV oil pump and reassembled. Had the windage tray, and I installed the Comp High Energy 268H (218°@.050, .454 lift) cam and lifters, plus the Comp 901-16 springs and new tock unbrella valve seals. Ran a '71 Thermoquad intake and carb (swap meet) and 1 5/8 Hedman headers. Used the Jacobs Energy Team ignition. Car was a '74 Barracuda with 3.23s and a 4sp. Ran the Centerforce II pressure plate and stock reman disk. It absolutely ate the disks but I worked at a parts store so it was warranty...lol. With 2 1/4" exh and Thrush "Sonic Turbo" mufflers it would go 13.2s @103. I beat the tar out of it. Never had a lick of trouble until i pinged it to death on some nice old lady's lawnmower fuel because I ran out in a valley in the middle of nowhere. I cracked some ring lands off the pistons...lol. It revved at least twice to 7Kplus, and routinely went to 6500. It went for miles at 6K (150mph indicated) at least 3 times a week on the way home from tech school. I'm sure that engine would run an A body deep in the 12s. With the 175hp plate it would run 12.50s with tire spin.

              You are only talking 3.31 stroke so I'll leave the 360s out of it...lol.
               
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              • rumblefish360

                rumblefish360 So close, yet so far away FABO Gold Member

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                RacerBob, put a vacuum gauge on the car and see how far down it goes at W.O.T. You shouldn't really be pulling anything over "1" inch. If you are, then a larger carb will probably be right.

                IMO, the 650 is good on top and must be great for the street. Though I would have thought the 750 would be better.
                 
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                • duster340

                  duster340 street racer

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                  haven raced my duster on the track but it has always been a real streetcar,streetdriven many many many miles everyyear lots of cruising and rock n roll and so on so i dont have any timeslips on it..

                  my first version of the 340 with stock rods and old heavy TRW dome pistons was shifted at 7500rpms all the time and never failed, except for one time when the inputshaft in the transmission snaped when shifting into 3rd and i saw the tach sweep up to 8000+ before i got my foot out of it that one just cost me a pushrod and inputshaft in the 904 transmission

                  later on i changed to a smaller solid roller cam,edelbrock rpm heads and eagle H beam rods, and have continued to shift the thing betwen 7-7500rpms for a few more years until some sad stuff happend to two bores wish have cost me alot of money because i decided a twinscrew would be nice,but im planing on letting the newbuilt blown 340 scream at 7000+rpm alot also im not worried about my shortstroke 340 not being able to withstand that kind of rpm since i know it likes it
                   
                • EL5DEMON340

                  EL5DEMON340 Well-Known Member

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                  360 flat top pistons, stock rods, crank,oil pan, oil pump, mild port " j's" 2.02, torker II, 750 dp, tti's full 2.5 exhaust to tips, small solid 244/252 @.050 520 lift cam, 4k stall, 3.91, 26" slicks. 3,480 lbs with me, 12.22 109.5 mph 1.66 60' only time at track.

                  71 Demon 340 (2).jpg
                   
                • earthmover

                  earthmover in the tire smoke

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                  30 over 340 with dome tops 185 cyl press on eagle h-beams , soolid comp cam 520/540 ,x-cal intake clen the runners up,holley 950hp, deep milodon pan,j heads with mild clean up 240/140 @500 with advance auto headers 1 5/8 into 3" pipes to flowmaster muff. cut off at the rearend, 727 with 9.5 dynamic verta 5000,4.57 gears with 27/10.5 qtp...in a 70 duster i think its about 3200 with me plan to check it soon a best of 7.54 @89. mph in the 1/8th mile should be good for 11.80 in the 1/4....(36degrees) run it on 111 race gas at the track,take the timeing down some and run 97 (32degrees)
                   
                • LIMEY VALIANT

                  LIMEY VALIANT Well-Known Member

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                  12.0018 secs @ 107.1 mph



                  1968 Plymouth Valiant, steel body, glass hood and trunk, cut doors and inner fenders, Lexan all round .. car weighs 2481 lbs + I weigh 150 lbs

                  Standard 340 + 030 flat top pistons. Comp Cams fast road cam ( can`t remember spec ). 114 leaded race gas. MSD 6 al plus MSD leads and dizzy. Hedmann tight block untuned headers. 10 psi fuel pressure upto fuel line cooler. Standard heads with new valve springs.

                  Edelbrock torquer 2 intake with Holley 670 cfm 4 bbl and Summit 4 barrel stack air filter.

                  Ford 9" rear end with Summitt ( rebranded Richmond ) 411 ring and pinion. adjustable rear Competition Engineering shocks, Calvert racing caltracs, Comp Engineering drag shocks on front.

                  45 psi front tires + 10 psi rear tires

                  This set up was probably only 250 - 300 hp but I have concentrated on traction / gearing / driveability / weight loss to get the numbers.

                  garage[1].jpg

                  garage_gallery-257-1253107714_thumb[1].jpg
                   
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                  • rumblefish360

                    rumblefish360 So close, yet so far away FABO Gold Member

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                    Yikes! I think 97 pump gas is not so easy to get here in New York! LOL 97 octane? Where where where?


                    That's the way to do it. Get her light!
                     
                  • rmchrgr

                    rmchrgr Skate And Destroy

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                    Wow, seems like some of these combos are really flying for being 'mild' so to speak. I think I'm on the right track with my plans. Geez, I might end up in the 11's if I can get the car light enough.

                    I guess the thing I'm looking at is whether or not to get a set of old 360 heads and have them ported and get large 2.02 valves or just go for the Indy/RHS heads and run them OOTB. Probably work out to be the same price and would flow similar.

                    Please post more fellas, this is good stuff. Street/strip cars are where it's at.
                     
                  • moper

                    moper FABO Gold Member FABO Gold Member

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                    It doesnt take a lot of power to run 12s in an A body. Simple as that. It does take real power. Not publicized or guessed power. I think the RHS heads will give a flatter torqque peak and more power than ported J style heads fir a lot less money. But it really doesnt matter how the air gets in. It just needs to get it in, burn it efficiently, and get it out.
                     
                  • 73swinger

                    73swinger Well-Known Member

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                    340, balanced, magged & peened stock rods, arp bolts, KB pistons, Edelbrock heads (open chamber like stock) 10:1 compression,Hughes hydraulic .540/.547 lift,232/237 duration @.050, LD340 intake,750 Holley DP, TTI headers full exhaust, 727 with 9 1/2" 3500 flash/stall,3.91 gears, 26" ET streets.
                    shift @ 61/6200 mid to high 12's in an all there 73 Swinger on pump gas.

                    rfr1.jpg
                     
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