Best Cam for a 340

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SB69GTS

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Has anyone run this cam XE268 or the XE284. Was wondering if the 284 was too much for the street. Will be running LD340 intake, TTi headers, 3.55 gears with a 727 tranny in a 69 dart with a 69 stock 340( unless I change the pistons). Carb is a holley 670 Avenger, Not sure on tires yet. Any thoughts guys.
 
Hotwheelsjr had a video of his Demo with a 284 cam.

It's a pretty raspy cam in a 340
 
I run the solid xe268 in my 360. I ran the numbers on desktop dyno and looked at the charts on the compcams camquest program and the solid XE268 had more torque than the solid xe274 until 5500rpm where they were about equal. The xe274 only had about 10 more ft-lbs than the xe268 at 6000rpm. I'm happy with it, the idle is smoother than my previous cam (magnum 280H), and it has better throttle response and feels like it pulls harder up high, but sometimes I wish it loped more at idle. I think you'd be giving up a bit of torque throughout the entire powerband below 5500 rpm if you go with the 284. If you're building something to operate at higher rpm you might be happier with the 284. Some other guys with more experience will probably have better advice. Don't take my numbers as gospel, they are what the computer spit out and they were for a solid cam, not the hydraulic versions. Good luck!

My combo is:
360 LA 10.5:1 compression
XE268 solid cam
Eddy heads
Eddy RPM air gap intake
Hedman small headers
Holley 750 double pumper
4 speed manual, 3.91 gears
 
I have to ask, why do you keep digging up 5 and ten year old threads?

Just curious.
 
I run the xe284. I have Holley 750dp, Airgap, massaged x-heads, true 10.5-1 compression, TTi headers, 727 with 3800 stall dynamic converter, 4.56 gears, 27in tall tires. Stock suspension and full interior including bench seat. Best pass is 8.09 at 85ish MPH (I don't remember exact mph)

[ame]https://youtu.be/XnHyUaDNxXg[/ame]
 
Has anyone run this cam XE268 or the XE284. Was wondering if the 284 was too much for the street. Will be running LD340 intake, TTi headers, 3.55 gears with a 727 tranny in a 69 dart with a 69 stock 340( unless I change the pistons). Carb is a holley 670 Avenger, Not sure on tires yet. Any thoughts guys.

"The Best Cam for my ***" is so subjective & Personal.

Considering you at least supplied enough information about the car and I'll assume it is a driver considering the gears and a "Stock '69-340" is in the car, I would have to say that the 284 is a bit high in its operating range for the set up. You didn't mention what stall the converter is....
And the catch of a converter is you will need more stall for a larger cam. Considering you have 3.55's, the converter may start getting a bit high for your taste.

The XE268 is a super streetable cam. The XE274 provides a few more rpm due to increased duration and a little more HP because of it & lift.

Choose your cam based on the rpm power band of the cam to match what your doing on the car. Street or strip?
 
^^ Eggzactically

Best, if there is such a thing, is best for what? Best can only be used a a descriptor of two very closely matched cams, and even then there can be times when either might be best, or neither.
I went through 3 cams in short order, cuz the first two were only best on paper or in my head.
The biggest problem I see is that I was naive. Picking a too-big cam the first time, and a too small cam the second time. The cam I have today is still not the best. But it's getting there. With every cam change, I had major chassis changes.And multiple tuning changes. So I learned a lot about cam choices. And as has so very often been preached, for a streeter it really is easy to overcam.
Having thus learned a little about cam choices, my next best-cam is going to be a little less duration, a little tighter LDA and as much lift as the cam guy will deliver on the smaller duration lobes.Te vreason for that is the 833/GV ratio spreads. with the rpm drops at under 1500, at redline, I'm gonna exploit that with a tight LDA, at the sacrifice of some low speed torque. I mean is it really necessary to spin the tires all the way through 2 gears? really? At this point I'm willing to give up a lot of low speed torque for a tighter powerband up top. But then IDK, 93 in the 1/8th is pretty good, and I ain't gettin any younger. Still, I know how the 106 cams idle..............Um... Maybe not.
I've always had a dream, since I started this madness. Back in 71, my old 70 Dart 340, ran 98 in the qtr.At age 18, I thought that car was mighty fast/quick. Well I've always wanted to build a combo to run 98 in the eighth. Seems like I'm close, maybe I should call it close enough.
Still, I've always wanted to try an Offy Dualport, with a deep port match, and a big TQ.Just FTHOI. For the heck of it!
 
LOL! They get a little choppy, LMAO!
I used a MP circle track cam once, (244@.050 on a 108 moved to 106) and an AVS 630 up top a single plane. Erratic idle. Non rhythmic. Scared many at the light. It had a crazy sound. But that's also a case of the wrong cam in the wrong arena. It sounded insane, but drive poorly at low rpm, woke up like nobodies biz in the right rpm range with great power.
Probably would have been awesome with the right set up.

I am also a fan of using as much lift as you can so long the head can handle it. If you have stock heads, In general, the head flows good until about .500. Use that as much as you can. If you have Edelbrock heads, they flow well to .... ***. Use as much lift to match the heads flow. It is hp waiting to be tapped.
 
Yeah, I would get some work done on the Eddies, fur sure. Cuz you can't put that much lift on a sub 230* cam, no matter how fast the rate of lift is. Ima thinkin it would be solid roller cam time, and some new springs
Yeah, maybe I'll just leave it be. The current combo is pretty sweet.
Ok maybe another stinking 108 cam then... Wait is there a whiplash cam in my future?............ Nope........ I am not, lowering, my,Scr. Nor will I build for premium gas.......On a DD that's not in a semi-retired guy's budget.
Oh heck, maybe I'll just have to buy a Jetta..............not..... I'd sooner resurrect my slanty Volare.

OP I have the answer. The best cam for a factory stock 340, is the one it came with. Those Chrysler engineers picked a winner.. It has a good power-band, a broad flat torque-band, idles well,works with power-brakes,lasts forever, doesn't make any kind of trouble, and the fuel mileage ain't THAT bad. For a DD that's just what you need. And in your combo as listed in post #1, it will be sweet. Just make sure it's got adequate valve seat pressure. I hate when the lifters pump up before the cam runs out.
Of course if you decide to tear into it, then, there would be options. Zero-deck flat-tops, closed chamber heads, AG intake, and a 230*ish cam, will guarantee to get you grinning. Or a stroker kit. etc.
 
AJ/FormS
Must have missed it

post #1 >>>>> 01-20-2010,

Hint from> Post#31 was a poke at Post#30, who,it seemed, had missed them.

LOL

think we all have senior moments, as we age.....
 
AJ/FormS
Must have missed it

post #1 >>>>> 01-20-2010,

Hint from> Post#31 was a poke at Post#30, who,it seemed, had missed them.

LOL

think we all have senior moments, as we age.....

When you're like AJ and you want to write a book about everything to show off your massive knowledge, you miss a lot.
 
Well when I read a thread I begin at post #1.
And I like to offer enough information in my first post for a guy to not have to come back in 20 minutes and ask for more help. Sometimes I don't get back to the thread for a few hours or days, and the poor guy might be left hanging.
I also like to offer insights as to what has worked for me. Or hasn't.
But if you all think I'm being wordy, I'll try to keep it shorter.
 
When you're like AJ and you want to write a book about everything to show off your massive knowledge, you miss a lot.

He's certainly not the only one doing that, and considering most are relative newby's,, It shortcuts the in-evitable follow-up questions, lol

I noticed my answers got shorter the longer I attended, and the more I repeated myself,

We all have fortes,, some more annoying than others.. but it's all good... lol

jmo ..
 
He's certainly not the only one doing that, and considering most are relative newby's,, It shortcuts the in-evitable follow-up questions, lol

I noticed my answers got shorter the longer I attended, and the more I repeated myself,

We all have fortes,, some more annoying than others..

jmo ..

I was pokin fun at him. It was a joke.
 
I knew you were Rusty, and I rolled with it, by putting enough words in the post to prove your point.And I enjoyed the humor. My posts kinda contrast with yours. I still like you a lot. And since it appears that we are both headed for the New Kingdom, I am looking forward to seeing you there.
 
If you were inclined to try the Comp cams XE284 cam and had reservations about it's street friendliness, take a good look at the Crane 699641.


To compare

XE284
Duration @.050 240/246
LSA 110

Vs.

Crane 699641
Duration @.050 238/246
LSA 114
 
I have the XE268 in my 69 340 4 speed 3.55 Barracuda. I LOVE that cam. It runs great, will scald the tires, has a great (slightly lumpy) idle, and is very streetable.
 
Ma Mopar called its own 284 purple cam to largest cam you could use in a bigblock with a stock stall convertor.
I would think a 284 in a 340 would surely like some extra stall.

I've had a 284 Mopar purple cam in a 440 powered heavy Chrysler Newport which only got 'happy' when backed by a 3800 stall convertor and 3.91 gears.
It would spin the tires (325/50/15) through 1st and 2nd gear.
 
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