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Tyler, 19
72 Dart Swinger /6T

I just went from 3.23 gears to 3.55. Much better off the line, and plenty of top end.

You may need to explain a little more what you mean by best performance? By best performance I think fastest 1/4 mile time. That may not be what you mean. If you have all the good stuff you listed already bought (rods pistons..etc) I would definitely use them. 10.5 to one is on the edge I think for pump gas. I would run a bigger cam and the 500 4 barrel if it was me. I would also dump the 3.23 gears and go with 3.73 -4.10 if your looking for performance. They will be fine on the street unless you plan to cruise at 75 or 80 on the highway.

Ryan's 72 Swinger build is over in the Virtual Dragstrip. He runs a lot bigger cam, 600 carb and 4.30 gears on the street. With the OD transmission it is not that bad at all.

Good Luck, keep us posted.

Rick

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

The cam would be correct if you are using cliffords junk, per their advice...

If you are going 10.5:1 compression you can use more lift and duration....
(and some headwork-porting/polishing/cleanup)

I'd lean toward keeping the 10.5:1, get an erson 270/270 or 280/270
ground on the 108LSA... you will still be able to run pump plus(89) and super(91+), keep your stock rockers, do your build like you have listed.

The 3.23's will have to go at that point...with the OD you can go much deeper...(3.91 would be a good "compromise" for street/strip...your ratio in OD would be 2.85...putting the ratio between the 2.76 and 2.94....)
(Yes I daily drive on 4.56's with my heavy car and the 833OD... I presently am running about 10.3:1 on the street and it's fine with plus...
tomorrow I'll be dropping in my next build, which looks promising at 11.48:1 and the taller cam should bleed things down to allow use of plus with reduced timing or super...)

Your carb choice is good, and the Aussie intake would make for a choice on this kind of build (longer rams would also help low end grunt...)

Clifford just wants sales, they need to catch up on present events...

Good Luck, hopefully we don't ruin you too badly...

-D.Idiot

Jack Clifford died years ago.....and so did his company.

You need more cam with that much compression. I like the Erson 280/270 ......

I agree you will enjoy lower gears,,,,at least 3.55s...

Id run the Clifford header but use a big single exhaust.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Woww! very surprised to get so many great replies so fast, thanks guys.

As for more info goes, This isn't really going to be a 1/4 miler. I live in South Florida (very hot summers and high humidity) and this car is going to be doing a good amount of I-95 high speed cruising(100+). I don't plan on screaming it up to 6 grand every shift either. I plan on taking the car out on the street and beating up on the pussy Fords and Chevs, and maybe the occasional drag pass. That's why i figured the 3.23 gears would be a good ultimatum for highway and street.

I forgot to mention i gasket matched the ports also. Would you recommend polishing the exhaust too? and i plan on throwing a small block rad in also to help cool it down with the high comp. I'm also running off of a Petronics replacement ignition and a high voltage coil. Should i use solid core or non solid core wires?

I figured Clifford was just trying to make sales by giving me his propaganda.

As for the Cam, do you guys still think that it is a bad choice for what i plan on doing with the car? I really don't want to buy another cam if i don't have to. It came with lifters, push-rods, HD 340 style springs, retainers and keepers and it wasn't a bad price.

If the Aussie intake and 500 Carter is a good choice i will definitely go for it. Its a lot cheaper than getting an Offy and a 390 Holley.

A few more questions:

Is a High Volume oil pump a good or bad idea. I have heard that the gear gets worn prematurely.

Also, I have heard that the smaller clutches tend to fly apart when you start putting some power to the wheels, but I'm having trouble finding any heavy duty flywheels or bell housings to fit a bigger clutch. I know that the 84-87 pickups and vans with the OD tranny have what I'm looking for.

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Tyler, 19
72 Dart Swinger /6T

I have a 2Bbl off of a 383. would that be another option to consider?

I know you guys are probably shaking your heads like "damn this kid can ask a lot of questions"

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Tyler, 19
72 Dart Swinger /6T

his headers are 3 into 1 though? are you talking about using a 6 into 1 or just putting them together instead of using an X-pipe?

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Tyler, 19
72 Dart Swinger /6T

These are clifford Shorty headers....

Most people like to run the 2 collectors into 1....then out.This is my drag car, so these header extensions just dump 24 inches back. I am also running a Clifford intake, and a 750 Eldebrock carb. I am running the Weisco pistons, and K1 rods.....I have 12:1 compression though.You will like the combo.Mine honks along running 12's in the 1/4 mile.
Andrew/Kidd

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Wife's: 64 Valiant
My: 70 Road Runner, 67 Barracuda, AND the 62 Valiant drag car!!

If you want the Aussie Speed Hurricane manifold and the new headers NOW is the time. Get on the Aussie Speed Group buy and save your self some shipping.
Frank
PS +2 for the Erson 280/270 cam yours is WAY to small

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

Okay ill order those today, are they cutting the shipping out of the price or something?

but as for the cam, I might still be completely wrong, but, this is a street car not a track car, I'm not sure if everyone is realizing that.

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Tyler, 19
72 Dart Swinger /6T

I run a street car with the 280/270 cam and Auto trans no problems.
As for the Aussie Speed order. Just send me a PM or Email me and tell me what you want and how you want to pay.
Thanks,
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

The cam is too small for that compression. You will get detonation on pump gas. A bigger cam will reduce cylinder pressures at cruise.

Youi need to learn about dynamic compression .

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Yeah....Im the one who destroyed this rare, vintage automobile.....

okay i understand, but since i already have the Clifford 260 cam brand-new in the box ill see if he will let me swap it out for his 280 cam.

The specs on that are:
Valve lift w/ 1.5 Rocker Ratio = .464 int/exh. Valve lift w/ 1.6 Rocker Ratio = .494 int/exh. Duration @ .050 = 238 Valve Lash = .016 int, .018 exh.

I'm looking at a cam chart and it's recommending a 625cfm carb for that cam though, is that correct?

Heres the link http://users.hal-pc.org/~bwhitejr/Slant_Six_Cams.pdf

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Tyler, 19
72 Dart Swinger /6T

but just for giggles where can i buy an Erson 280 cam?

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Tyler, 19
72 Dart Swinger /6T