440 six pack to drag strip

Well its almost time to test out new the six pack at the drag strip. Wednesday May 4th at Thunder Mountain (Bandimere) will be the big day. Previous best was 13.30 @ 100 MPH with a Performer RPM and a Holley 780. So I will post the results here shortly after the test session. No other changes have been made other than a valve adjustment. Just installed a new six pack set up with new carbs, linkage, intake. I will be using the same slicks as last year. I hope it goes faster!

Can't wait to see your time slips. I did the same thing years back but never went to the drag strip again so I don't know what the time improvement was. I can tell you my street racing experience was significant.

Now it's running consistent 12.90s @ 105. Improvement of .4 sec and 5 MPH with the six pack installed. Not bad for 5600 feet.

Sweet move. I wonder how much the altitude impedes performance. I wonder what you'd get at sea level.

I think sea level will get .8 sec better E Ts. The wallace calculator indicates a Horse power correction factor of 1.29. Then using this factor it calculates a sea level ET of 11.85@114. The high altitude really reduces performance on a normally aspirated engine.

6-pak stuff works good. See picture

Wow - that is one cool pic. Wish my six pack would do wheel stands like that. What a rocket ship. Love it.

I did best 12.96 with slicks, tweaked dual points and open factory headers, in 1969 right out of the show room. Consistent low 13.s. never even came close to any wheels off the ground. This car looks like it should be a lot faster.

so it's making about 50hp more than the 780 and rpm intake. i think the wallace calculator is a little generous but i'm sure there's more in it. i went 107.92 at 800ft altitude; stock exhaust, 3.23 rear, auto, 4060lbs, 225-70x15 ta radials.

i've always been a die hard 6pak fan, but i've been playing with this the past couple of years and really like it.

Nice pic op. I have seen a couple of 6 pack vs. "other" 4bbl + intake Mopar RB comparisons. I will stick with the 6 bbl setup, even if I am leaving some HP on the table. It's a V code Roadrunner after all..
Glad to see you have done so well with yours!

biomedtechguy said:

Nice pic op. I have seen a couple of 6 pack vs. "other" 4bbl + intake Mopar RB comparisons. I will stick with the 6 bbl setup, even if I am leaving some HP on the table. It's a V code Roadrunner after all..
Glad to see you have done so well with yours!

Click to expand...

the only way you will leave anything on the table is if the 4bbl intake can flow more air. that's not always the case with a dual plane. i think the indy dual plane can flow more air and the rpm intake is about equal to the 6pak. the race type single planes will flow more air and make more power up top than a dual plane. the 6pak makes more power than the ch28 i'm using, but the ch28 is much easier to tune.

My target for a stroker motor is mid 600s HP and Torque. I have 3 builders that I have narrowed my choices to including Mike of MRL. I have seen that they have dynoed 6 bbl motors and am sure they can get it done. At least one of them has some 6 bbl intake massaging capability. Also, most of the car's duty is car shows and crusing, although I'm sure that its time at the track will increase after the new mill goes in point being that the low and mid range torque and "driveability" of the 6 bbl intake is as important as the ultimate HP capability.

the versatility of multi-carb cannot be understated.

I had Jim @ LaRoy engines do mine. 9.9:1 trick flow heads and a mild solid roller cam. 590HP

RPM..................Victor TQ/HP..................RPM TQ/HP..................6-pack +/- vs the RPM

3000...................472/269.......................495/283.....+23/+14
3100...................468/276.......................500/295.....+32/+19
3200...................483/294.......................515/314.....+32/+20
3300...................500/314.......................541/340.....+41/+36
3400...................513/332.......................546/354.....+33/+22
3500...................514/342.......................547/364.....+33/+22............574/383....+27/+19
3600...................516/354.......................550/377.....+34/+23............562/383....+12/+5
3700...................510/359.......................552/389.....+42/+30............564/397....+12/+8
3800...................516/373.......................555/401.....+39/+28............561/406......+6/+5
3900...................520/386.......................555/412.....+35/+26............560/416......+5/+4
4000...................528/402.......................558/425.....+30/+23............559/425......+1/+0
4100...................529/413.......................553/431.....+24/+18............557/435......+4/+4
4200...................532/425.......................553/442.....+21/+17............556/445......+3/+3
4300...................539/441.......................548/449.......+9/+8..............548/449........0/0
4400...................545/456.......................552/462.......+7/+6..............551/461.......-1/-1
4500...................550/471.......................554/475.......+4/+4..............552/473.......-2/-2
4600...................554/485.......................553/484........-1/-1...............552/483.......-1/-2
4700...................552/494.......................550/492........-2/-2...............554/496......+2/+2
4800...................562/513.......................558/510........-4/-3...............553/505.......-9/-8
4900...................560/522.......................556/518........-4/-4...............553/516.......-7/-6
5000...................562/535.......................552/526.......-10/-9..............556/529......-6/-6
5100...................561/545.......................558/542........-3/-3...............560/544......-1/-1
5200...................551/546.......................556/550........-5/-4...............556/550........0/0
5300...................554/559.......................548/553........-6/-6...............552/557......-2/-2
5400...................546/561.......................546/561.........0/0................555/570.......+9/+9
5500...................549/575.......................544/570........-5/-5...............552/578......+3/+3
5600...................541/576.......................532/568........-9/-8...............544/580....+3/+4
5700...................539/585.......................530/575........-9/-10.............534/579......-5/-6
5800...................534/590.......................517/571......-17/-19.............528/583.....-6/-7
5900...................526/591.......................508/570......-18/-21.............524/589.....-2/-2
6000...................512/584.......................497/568......-15/-16.............511/583.....-1/-1
6100...................503/585.......................480/558......-23/-27.............502/583.....-1/-2

I had him compare a victor, & RPM with a 950 to the 6 bbl

Given that my target HP and Torque is substantial, and other than going down the 1/4 mile "for fun/grudge matches" my car is for fun, shows, and crusing, I am ok with keeping the 6bbl and giving up some power in the ranges that you have shown. Overall, not too bad.

My target was 11.50 et because of not wanting a rollbar. This is going to be in a AC car with gearvendor OD that will get driven a lot. Cam was a 236/242 @.050 with a net lift of .630 with 1.6 HS roller rockers. 112 LSA so it would have a good idle. I was aiming for a 5800 shift point which I could do in drive with the max wedge governor.

Sounds like a great combo, 69 GTX! The lower ET (for me) comes as much from gobs of torque throughout the RPM range, as anything. As we have seen from your dyno results, the 6 pack helps produce a very flat torque curve (line), that is way up there on the scale. Your builder (Jim) did a fantastic job on this motor. Hows it coming? Getting close to test time yet?