Realistic Expectations - 11 second Demon weekly driver

Big Block A body Tech

  1. roccodart440

    roccodart440 Well-Known Member

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    It's not even really about the ability of iron heads. It's money invested vs. what you're left with in the end. Last pair of iron heads I did, and this was 17 years ago or so cost me 1200$. You can get a set of aluminum heads for less than that and they are repairable and can be worked beyond their OOTB condition.
     
  2. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    Exactly.
    Iron heads can be ported to a powerhouse part. Now weigh the cost of the iron head work vs. an aluminum head as in a OOTB condition plus machinist check for a good bill of health to bolt on.
    Compare flow rates vs. dollars spent vs. weight.

    Pick your parts, spend your money.
     
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    • dadodgekid

      dadodgekid When in doubt... floor it FABO Gold Member

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      He has the heads already and they have an oversized valve... just run the stuff !! Lol
       
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      • roccodart440

        roccodart440 Well-Known Member

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        Maybe I'm misunderstand the OP. Sounds like his heads aren't ready to run.
         
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        • Brewzer67

          Brewzer67 Well-Known Member

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          I agree with dadodgekid wholeheartedly. When I first started racing my Coronet way back when, it had a 448" in it that was a stroked 383" with the offset ground 440" crank @3.90 stroke. It weighed in at a whopping 4500 lbs. race weight and was running 14.0's. With just a set of slicks and lots of tuning and testing I got the car down to 12.0's (114mph) at that same porky weight. The cam was small a .480 hydraulic (230@.050) and just some pocket ported 906's so it definitely performed better than it should have. Put that motor in an A-body and I am sure you could get down to low 11's and drive it drive as a Friday driver. I hammered on that car for 2 years that way driving it 45 miles to the strip and back twice a week. I also drove it daily for the most part and is was very docile. The craziest piece was the 4.30 gears, but I also had 28" tall tires so it wasn't too out of hand. Once you are sure you hit your maximum time/speed with your combo, decide what the next speed is you want to go and build a new combo to get there. Throwing parts at an old combo usually is more expensive in the long run when trying to make a big jump.
           
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          • xguard

            xguard Member

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            They could be run as is. I had it running with them before but didn't take it to the track.

            I talked to Dwayne Porter yesterday. Think I'm gonna follow his advice and buy a set of Trick Flow heads.

            From what I've seen, going to the oversized valves on 915's decreases flow (with out a lot of other work). It shouldn't be that big of a set back to save for the heads.

            The motor is out of the car right now anyway. Seems like an opportune time to spruce it up.
             
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            • mopar65

              mopar65 Well-Known Member

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              Dewayne is the man. He is the one I got my Indy EZ heads and solid roller cam from. I finally got my dart down to 10.49 in the 1/4 with 4.30 gears and 28 street tires. I think it would of been faster with the 4.10 but I blew them up. So I had a set of 4.30 laying around. Lol
               
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              • AndyF

                AndyF Well-Known Member

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                The 915 heads are probably worth more unported than ported. There are guys looking for 915 heads and typically they want to finish them themselves. If it was me I'd sell any iron heads I had to fund buying aluminum heads. I agree with Dwayne on this one. If you're looking for performance then go ahead and get the 240 Trick Flow heads now. You could spend $1000 or more on your 915 heads and still not be happy and then when you try to sell them you'll just get the stinkeye from the resto crowd since your heads have been ported.
                 
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                • aaronk785

                  aaronk785 Well-Known Member

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                  Go Trick flow. I gained nothing going from home ported 915s to OOTB edelbrocks. Actually I lost some because of the weight savings. This was on a 10.90 car.
                   
                • Hot Metal

                  Hot Metal '69 440 Cuda

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                  To give you an idea of what it took for my 3000lb '69 Cuda to go 10.7's@125 was>
                  440sp block, 9.8:1, template ported 906's 2.14/1.81, HS r/rockers, a too big .650 Comp solid, Team G, 850DP, 4800 8" vert, 14x32's, 4.88's, L/bars/coil-overs. I may not have had the best set up in it and it may have been a bit quicker as I only ran it the once like that before hitting with spray, it ran 11.2@118 with the dead stock 906's I took off.......If you have the $$$ go with the 240 trick flows should run your numbers with those.
                   
                  Last edited: Jun 16, 2017
                • Bighead440

                  Bighead440 Well-Known Member

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                  A big block should be fairly easy to make run low 11's (streetable) with a little more gearing and the right heads. I ran 11.30 @119 in a full weight '71 Demon with a mild solid-lifter 416 SB stroker and OOTB Edelbrock RPM heads, on 89 octane in the heat. 3.91 gears and 3000 stall, so it was pretty liveable on the streets with 28" drag radials.
                   
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                  • rumblefish360

                    rumblefish360 So close, yet so far away FABO Gold Member

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                    I like this. Easy basic recipe. Nothing fancy. It doesn't have to be fancy. Just effective.
                     
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                    • famous bob

                      famous bob mopar misfit

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                      cheap and easy, but what do they flow? Probly not over 280 !
                       
                    • rumblefish360

                      rumblefish360 So close, yet so far away FABO Gold Member

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                      While that maybe true, it is 280cdm at what lift? Does his cam lift that much? Do you need to lift the cam that much? I say "NO!"
                      The head flows enough with the duration of his cam and the rest of the package to run the time. And that's the bottom line.

                      Can it be done with as cast OE heads?
                       
                    • mbaird

                      mbaird mbaird

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                      My 70 Charger in full trim weighing 4000# ran 12.30 with 3.55s ...stock bottom end, 8.9ish comp, ported 906s , .550 solid roller, Hooker headers and full 2.5 exhaust, 6 pack intake.....
                      Daily driver for several years... 14" @ idle....
                      Stuff that in a 3300lb abody.... No problem...
                       
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                      • roccodart440

                        roccodart440 Well-Known Member

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                        I believe OOTB Eddys flow 292. I can't say for sure. My new heads flow 345cfm.

                        The old cam with those OOTB eddys was a 242@.050 and .528 lift. It ran 11.70's all day every day and other than a couple tsack days a year is a street car I even take to the grovery store.

                        Those slips are on street tires, pump gas and full exhaust
                         
                      • rumblefish360

                        rumblefish360 So close, yet so far away FABO Gold Member

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                        Man! Ow I’m going to have to re read the whole thread from 3 years back. DANG IT!

                        LMFAO!
                        :lol:
                         
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                        • abodyjoe

                          abodyjoe Well-Known Member

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                          screw it. just go turbo LS and be done. :)
                           
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                          • MOPAROFFICIAL

                            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                            The 915 heads with that combo can get you 12.00 all day if ported a lil but by someone who can get an honest 260cfm. They start off at 220-228 cfm as cast iirr
                            Moderately to to fairly well ported should be close to 300cfm with those valve sizes.
                            Full boogie over 300 but the 906 will do more as an open chamber...@IQ52 would be the most experienced and more knowledgeable person to ask of the potential. I know I can get 280's out of a set with 2.08 int by .500-.550. As other said though.. it would be easier, more ootb to attain your goal with a set of aftermarket heads like 440 source or victors... but really you should see what you have and get test of what you think is the best looking port and the worst looking one and base you choice on that. For all you know... you already have 280's or the necessary flow.. and the rest may be drivetrain/suspension dialing.
                             
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                            • PRH

                              PRH Well-Known Member

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                              It’s been 3 years..... hopefully the OP has made a decision by now.
                               
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                              • xguard

                                xguard Member

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                                I bought the Trick Flow heads. I'm putting it together now! My wife went to college and now grad school. It hasn't been kind to my hot rod budget :(. But we're getting there!
                                 
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                                • rumblefish360

                                  rumblefish360 So close, yet so far away FABO Gold Member

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                                  Been there done that and it’ll be worth the pay out once all is said and done.
                                   
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                                  • SuperStock426

                                    SuperStock426 FABO Gold Member FABO Gold Member

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                                    Take that Team G and throw it away. One of the worst intakes. Get a Victor 440.
                                     
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                                    • famous bob

                                      famous bob mopar misfit

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                                      Not entirly true , I got a team G that flows in the 325 range and only about 25 cfm diff between the runners ,320 being the lowest , that aint that bad . Had to do the same things to my victor to get it in the 350ish range , and the team G has a bigger plenum . To my way of thinking , the plenum on a victor is too small for a 505'' engine .
                                       
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                                      • PRH

                                        PRH Well-Known Member

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                                        As always, “ymmv”..... but my experience has been that...... on the dyno and at the track, the 4150 version TG is kind of a dud.
                                        There is often a big hole in the power curve right in the area of the stall speed for the typical street/strip combo.
                                         
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