#6---Big Block Stroker 6 Pak Dyno Test (7279)
6 Pak to Go

12/18/2014
David Hughes


 

This is the dyno test of what has become a very popular engine combination in several ways.

A 500 cubic inch stroker for a street (pump gas) and once in awhile we'll run it down the track type of request that we commonly get. This customer wanted gobs of torque for fun on the street and a 6-pak carb set up. The 500 engine will have gobs of low end torque to start with, but, this customer wanted as much torque as possible for his 4,000# car. To get this, we used one of our hydraulic roller camshafts (HER3642BL).

 The 6 pak set up was new with all factory sized fuel lines. These small fuel lines concerned us as to whether we would be able to get enough fuel through them to feed this monster. We were estimating 570-580 Horsepower maximum for that reason alone. This is a 493 engine with our H.P. ported Edelbrock heads, our roller rockers (1520S-16) and headers.

 

Dyno Test #1(6-Pak)

RPM Horsepower Torque BSFC
3300 372.60 593.00 0.485
3500 395.40 593.30 0.043
3700 442.50 628.10 0.356
3900 482.20 649.30 0.419
4100 516.70 661.90 0.437
4300 539.20 658.60 0.431
4500 566.70 663.40 0.396
4700 582.20 650.50 0.389
4800 593.00 648.90 0.403
4900 600.10 643.20 0.387
5000 604.00 634.50 0.400
5100 610.50 628.70 0.408
5200 611.50 617.60 0.408
5300 619.80 614.20 0.407
5400 621.50 604.50 0.415
5500 616.00 588.20 0.426
5600 615.40 577.20 0.436
5700 619.80 571.10 0.443
5800 618.20 559.80 0.439
       
Average:      
4550 540.30 625.40 0.416
       
Minimum:      
3300 372.60 559.80 0.356
       
Maximum:      
5800 621.50 663.40 0.485
 
 

     As you can see from Dyno Test #1 the engine pulled up to 621 HP and 663 ft/lb torque. It was well above 500ft/lb torque at 3.000 rpm and averaged 526 ft/lbs from 3300 to 5800 rpm. This was a very smooth, super torquey engine. Also note that the BSFC were nearly perfect throughout the majority of the run.

  

     

Dyno test #2(4-Bbl Victor)  
RPM Horsepower Torque BSFC Volumetric efficiency
3000 341.00 597.00 0.422 91.9%
3100 344.80 584.10 0.444 89.8%
3300 359.40 571.90 0.441 86.7%
3500 389.10 583.80 0.411 86.9%
3700 419.50 595.50 0.398 89.4%
3900 468.30 630.60 0.386 95.9%
4100 515.30 660.10 0.381 101.0%
4300 549.30 670.90 0.396 103.3%
4500 580.60 677.60 0.398 104.7%
4700 601.50 672.20 0.403 104.5%
4900 618.00 662.50 0.421 104.7%
5000 626.10 657.60 0.410 104.8%
5100 629.00 647.70 0.402 103.8%
5200 635.00 641.40 0.417 103.8%
5300 645.60 639.80 0.429 103.9%
5400 641.10 623.60 0.408 103.3%
5500 641.50 612.60 0.438 102.2%
5600 639.50 599.80 0.443 101.8%
5700 644.40 593.70 0.446 100.8%
5800 639.30 578.90 0.437 99.8%
         
Average:        
4400 527.10 626.80 0.413 98.4%
         
Minimum:        
3000 341.00 571.90 0.381 86.7%
         
Maximum:        
5800 645.60 677.60 0.451 104.8%
   
   Next we installed a Edelbrock Victor 440 intake #5415 along with our deep port match (I320) and a 950 HP Holley carb. Keep in mind that the 6 pak carb set up flows 1300cfm and we are using a single 950cfm carb and this test tells you three things.
 #1. The 6 pak intake manifold is not very efficient.
 
 #2. Regardless of what any one component flows (in this case, 3 2bbl 
                carbs) it wont do
much if the rest of the system (manifold & heads)
                wont flow with them. The power you
can produce will always be
                limited by the most restrictive component in your
combination.
 
           #3. This Victor 440 intake really did the job!

  As seen in test # 2 with the 950 HP carb and Victor intake the horsepower was less, as you would expect until 4100 rpm but it peaked at 26HP more than the 6 pak at the same rpm, 5300. The torque was lower as well unit 4,000 rpm but it eventually peaked at 17 ft/lbs more at 4500rpm or 200 rpm higher. These BSFC numbers were even better than the 6 pak. Realizing now that the 6 pak carbs will flow enough fuel we would build this engine a little differently and make even more power. Having seen what the single 4 bbl and Victor intake did, we know that with some changes this engine could make much more power. These combos make very good street engines with plenty of tire shredding power down low and should take a 3700# car/driver into the mid-elevens with cruiser gears and minimal stall speed. With some serious chassis parts and these combinations this baby would scare the 10s.if you can hook it up!

We can supply any and all the parts you need to build either one of these engine combinations at home or well do it for you. The owner of the car said it was frightening to drive on the street. The torque was so explosive that you had to be very careful with your right foot. No, this car hasnt been to the strip yet.

(2011) Parts list for this engine:  496 stroker, 4.360 bore, 4.150 stroke, Diamond pistons with 10.6:1 CR. Works well with 92 Octane gasoline. Stroker kits are custom-order. Edelbrock RPM heads w/full CNC porting with 2.19" intake valves (p/n 60929-S3).  3X2 Bbl Edelbrock intake manifold with deep port match (p/n 2475DPM) and Holley 2Bbl carbs. Edelbrock Victor standard port intake with deep port match p/n 2954DPM and Holley 950HP carb. Hydraulic roller camshaft (p/n HER3844BL), 1.6 ratio roller rockers complete with shafts (p/n 15203), custom-length pushrods, MSD billet distributor (p/n 8546) with custom curve, 1" open carb spacer, 2" TTi headers.

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