4bbl as fast as a Six Pack?

[IQ52]

I would think it depends upon who is prepping and tuning them.

 

[68 HEMI GTS]

Slightly off topic but if anyone is interested that engine masters show on YouTube compared a dual quad set up to a six pack. Everyone agreed six pack looks cooler but dual quad way out performs. Would be a cool follow up episode to compare a big 4bbl to the six pack like we've been discussing.

That was a chevy set up, not apples to apples

 

[68 HEMI GTS]

Last Spring I took my 496" wedge with a 6-bbl in my '69 Road Runner to Maple Grove. I had issues with my 6-bbl, so I also brought along a TM7 with an 850 Holley that was "set up" before hand. I ended up putting the 4bbl on the car and it ran an 11.62 @116MPH. This past black Friday, in better air at Atco (usually a tenth or two faster than Maple Grove) I ran my 6-bbl set up. It went 11.55 @ 118 MPH. I think the two are virtually identical in performance. There's no question which looks better, and I'll continue to run the 6-bbl. As a side note, I can definitely tell the difference in gas mileage between the two. The 6-bbl gets way better mileage than the 850. My two cents....

You pretty much had the same experience as me.

 

[Garys1969RR]

All other factors being equal, I really do believe the six pack set up is DEFINITELY going to out perform most single 4 barrels. We pulled the RPM intake and 780 Holley off my 69 RR, put on a new six pack intake and carbs, and went from 13.30 @ 100 MPH, to 12.90@105. So .4 sec and 5 MPH faster with the six pack. Nothing else was changed.

 

[68 HEMI GTS]

All other factors being equal, I really do believe the six pack set up is DEFINITELY going to out perform most single 4 barrels. We pulled the RPM intake and 780 Holley off my 69 RR, put on a new six pack intake and carbs, and went from 13.30 @ 100 MPH, to 12.90@105. So .4 sec and 5 MPH faster with the six pack. Nothing else was changed.

alot really depends on the engine combo, they work great on everything from stock type engines to mild strokers like my 511 in my heavy b body. If I built a 13:1 500 ci motor with a .750 lift roller though I would probably be inclined to go with a single plane or tunnel ram. Your just not gonna beat the distribution. As engines get into that finiky stage I wouldn't want to worry about a lean hole. I noticed on the bigger motor the six packs distribution starts getting a bit whacked.

 

[not so famous bob]

alot really depends on the engine combo, they work great on everything from stock type engines to mild strokers like my 511 in my heavy b body. If I built a 13:1 500 ci motor with a .750 lift roller though I would probably be inclined to go with a single plane or tunnel ram. Your just not gonna beat the distribution. As engines get into that finiky stage I wouldn't want to worry about a lean hole. I noticed on the bigger motor the six packs distribution starts getting a bit whacked.

if you put a victor intake and 950-1050 carb. and jetted it right , it would definitely out perform the 6 pack !!

 

[Dreamcatcher]

Unless your talking stock six pack to stock 4bbl it is apples to oranges. I am sure an after market aluminum manifold with a large 4bbl set up would out perform an old original cast iron six pack set up. I ran my six pack set up and it was good but when going to my offenhouser 360 aluminum and compaction carter I think it runs better. I would think that for quick acceleration the six would be quicker but for top end it all comes down to total cfm of air and fuel.

 

[68 HEMI GTS]

if you put a victor intake and 950-1050 carb. and jetted it right , it would definitely out perform the 6 pack !!

Would my roadrunner be faster with a victor? There's a good possibility. But I would go with a trick flow over the victor because it appears to be a better manifold. I already proved that it's not a blow out either way with a decent (but old school) single plane vs six pack. at least on that combo. (Both very well tuned). I may try a modern single plane just to put some real world e.t. numbers down instead of speculation. Have to see what the summer brings, I plan on testing out my mechanical six pack carbs too. I still like the fact of having a legit 10 sec six pack, just something you don't see a whole lot.

 

[kiwigtx]

I'm no expert here, but my car ran about 1.0 second faster here on a 6-BBL configuration over the current 4-BBL setup.
Maybe it was weather - late autumn (fall), or maybe good luck....but the car seemed to sing a different song with an extra 2 barrels.
I don't race a lot, so it might have been just a huge co-incidence.

 

[69 GTX]

We did some dyno testing on my engine with both a single plane, dual plane & 6pack set up.

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
This is a 440 .030, 9.9:1 trickflow head combo with a solid roller cam with 1.6 RR.