6 Pack vs. 650 4BBL?

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RustyRatRod said:
But you also have to look at that from a class perspective. Six packs have dominated certain classes. That cannot be denied.
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Yeah I knew damn well some would give me hell for that. LOL
You take 2 average guys weekend hot rodders, give one that ld340 and 750 Holley and the other that vac 6 pak and intake that had issue with fuel distribution and how many times will that ld340 750 guy whoop on that 6 pak before he has it reworked and tuned to make that actual 930 cfm ish setup to return the love? Who knows, I'd rather have an 800 Holley on a 340 than a 750, but hey..
Whatever mixes better and is consistant, I'll take it, whichever it ends up being.
 
never run a 6 pack,..but im a big fan of thw LD340 and 750DP!! big fan of the stock intake and thermoquad to for the street,..but 750DP or bigger is in my opinion best for racing!
 
rumblefish360 said:
An LD-340& a 750 faster than a 6 pack?
Ohhhh ho ho man a know a few locals will laugh there *** off at you for sure!

The second part of the quote about racing is an unfair match up.
And you know it. LMAO!
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Oh wait now...ok, sounds like you're talking money now, and 750 is vague if money can rework to flow more ;)
Stock for stock, a thermoquad on a 340 would handle a 6 pak on same 340...and most 6 pak street cars, tons right ? ;) will lay down to a 750 on a ld340 engines the same without someone who knows how to tune and rework manifolds. Some can., most cant.
 
Naw, what we're sharing is opinions. The problem is, when somebody makes a recommendation that may not fit in your idea, then some feel personally attacked and try to prove there points. Nonsense. No need to quote anyone for your amen corner.

In the end it's up to the OP. Fact is, when they were new the 6 pack offered 15 more hp. All that was really recommended was there are MUCH cheaper ways to get 15 hp, and they have been offered. I didn't read where anyone said 6 packs are junk. In fact, all said they were cool.
 
Look at the Finals of the 2017 US Nationals...Stock Eliminator.....69 340 dart with LD 340 vs 70 340 6 pac Challenger...

Both in same class heads up no breakout 1st one to the finish line wins....
 
And if both engines were perfectly identical except the carbs and intake, we would have a reasonable shot to say which is better. Oh wait, driver error, or sleepy driver.

Back to back unbiased dyno operated runs would do it for me.
3310 & a DP vs 6 pack would do it!
 
Left Larry GilleyWIN E/SA 11.70 .022 1.388 4.212 6.656 99.98 8.796 10.622 123.07
Right Darrell Steiger E/SA 11.70 .032 1.390 4.214 6.666 99.67 8.800 10.619 123.54

.003 difference in ET...
 
70aarcuda said:
Left Larry GilleyWIN E/SA 11.70 .022 1.388 4.212 6.656 99.98 8.796 10.622 123.07
Right Darrell Steiger E/SA 11.70 .032 1.390 4.214 6.666 99.67 8.800 10.619 123.54

.003 difference in ET...
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that's a cool comparison. And I think that was the point of a lot of the responses here, that the six pack gives a "wow" when u pop the hood, but a very expensive way to try to gain 15 horsepower... if you can gain it.
 
70aarcuda said:
Left Larry GilleyWIN E/SA 11.70 .022 1.388 4.212 6.656 99.98 8.796 10.622 123.07
Right Darrell Steiger E/SA 11.70 .032 1.390 4.214 6.666 99.67 8.800 10.619 123.54

.003 difference in ET...
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Who was who?
LMAO!!!
 
Yea man, I see what ya mean. Minor enhancements. I wonder what a bowl porting would have done even at the low lift. Then 1.6 rockers or a most modest cam swap? The stock 204 to 214 to 224. Still in the super streets or duration range.

Still, the article was just a simple induction comparison.

(If or I should say, when I win lotto...)

I’d like to see a few intakes up top. A RPM, Action Plus, Stealth, etc.... several carb swaps. Several minor cam changes.
Like I said, after I win lotto! No problem.
 
70aarcuda said:
Look at the Finals of the 2017 US Nationals...Stock Eliminator.....69 340 dart with LD 340 vs 70 340 6 pac Challenger...

Both in same class heads up no breakout 1st one to the finish line wins....
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in nhra stock the rule is stock intake and stock(except jetting) carbs, and the 70 challenger is heavier than the 69 dart
 
68 HEMI GTS said:
I like mechanical carbs as much as the next guy but, this BS about vacuum carbs not working is unreal. So is some of the other nonsense in this thread. The idea is to build combos and parts that work together. I remember now why I avoid these kind of threads.
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Every watch a VS carb on the dyno? Many times the secondaries don't open. No matter what spring.

Yes, you can make them work but why bother? I spent years making cars go faster by junking the VS carbs. That's was I was paid to do, make them faster. 99% of them were automatics and they all said the same crap. DP for sticks and strip and VS for autos and street. Not one of them ever went slower with a DP.
 
yellow rose said:
Every watch a VS carb on the dyno? Many times the secondaries don't open. No matter what spring.

Yes, you can make them work but why bother? I spent years making cars go faster by junking the VS carbs. That's was I was paid to do, make them faster. 99% of them were automatics and they all said the same crap. DP for sticks and strip and VS for autos and street. Not one of them ever went slower with a DP.
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Hey I get it, in your world it’s a one size fits all. That’s your opinion and your entitled to it. Do I agree, nope!
 
I could probably get into my girl friends undies, but do I, nope. Oh wait this is a family show.
 
Hi Guys,

I would like to update the 74- 413 390 HP dart, with 3:55 gears and all conversion hardware.
I use a 600 Eddy.
What 4 bbl would satisfy this RB for mo" HP.
I think maybe 2X4 setup. would a 780 satisfy the urge. I am installing dual snorkel scoop,
to fit 14" or 2x4 cleaner.

Thanks, ddume in VA,
 
ddume said:
Hi Guys,

I would like to update the 74- 413 390 HP dart, with 3:55 gears and all conversion hardware.
I use a 600 Eddy.
What 4 bbl would satisfy this RB for mo" HP.
I think maybe 2X4 setup. would a 780 satisfy the urge. I am installing dual snorkel scoop,
to fit 14" or 2x4 cleaner.

Thanks, ddume in VA,
Click to expand...


there again it all depends on what cam, cr, type of driving, max rpm, and so on.
the more info the better
 
ddume, a single 4bbl of 750/780 would be very good IMO. While you could get away with a larger carb, it may be a pain to tune. If you went 2 X 4, IMO, a pair of Holley 450 cfm carbs or twin Edelbrock 500’s. That’s what I would do myself.
A lot in getting a carb generally seen as to big is in the gears, converter, cars weight, cam and useage.

With 3.55’s, I’m better it’s a real streeter. You haven’t mentioned a cam size or anything else. So, that would be why I suggested those carb sizes.
 
brian6pac said:
Unfortunately Larry Shepard is no longer with us and his shop is about 10 miles from my house
I used to talk to him when I was a young in the 70's, him and a guy named John Barker who was a engineer and a die maker at the twinsburg plant that was the max wedge guru. All the racers around called Barker the professor because he knew so much about the math that went into building engines.
As 68 hemi says, I was talking to the guys at Indy cyl heads about a year ago and they claim they have made a 440 with the modman manifold with vacuum 6 pack make over 1000 HP.
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Here
DSCN1732.jpg
is a picture of Larry Shepard's Hemi RR in front of his shop on S. Main St
 
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