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Which intake should I use for my build? #937676
02/26/11 01:51 AM
02/26/11 01:51 AM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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I have a 383 with stock compression (measured at low 8's to 1). I plan on putting it together with only the parts I have (no buying any parts). I have three camshafts and have chose to use the big Summit cam (specs below). I want this engine for street driving only. Something for a daily driver. I will run headers, a 750 vacuum secondary Holley with 3.23's in an auto.

Question is, I only have two intakes; a Torker and stock iron manifold. Was leaning towards the stock manifold but didn't know if I would just be fooling myself or not. What do you think?

Cam Style Hydraulic flat tappet
Basic Operating RPM Range 2,000-5,500
Duration at 050 inch Lift 224 int./234 exh.
Advertised Duration 282 int./292 exh.
Valve Lift with Factory Rocker Arm Ratio 0.465 int./0.488 exh.
Lobe Separation (degrees) 114

Last edited by VITC_GTX; 02/26/11 02:03 AM.
Re: Which intake should I use for my build? [Re: VITC_GTX] #937677
02/26/11 02:44 AM
02/26/11 02:44 AM
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Aurora, Colorado
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Had a simular combo 383 (around 1991), and it was pretty much a compromise all the way around. My biggest mistake was using the stock torque converter. The cam (pretty much the same 0.050 duration as yours) killed off too much low end torque, and with the stock converter it was slow off the line. Midrange power was good, but not alot of high end power either. I would shift at 5,800-6,000 RPM.
I ran the stock ('71) intake first, and it was decent for the combination. I then used a Weiand Action Plus, and din't notice any real difference over the stock intake. Then I installed a Weiand single plane (maybe a Team G) which only slightly helped the upper RPM range, but made low end torque worse.
Anyhow, changing out intakes on a big block is pretty easy. I'd start off with the stock intake, at least all the stock linkage will work with it.
If you have the funds, get a good hi-stall torque converter (2,800+ RPM) to hide the low end power loss.

Re: Which intake should I use for my build? [Re: VITC_GTX] #937678
02/26/11 03:01 AM
02/26/11 03:01 AM
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Lincoln Nebraska
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Quote:

a 383 with stock compression (measured at low 8's to 1).(no buying any parts). a daily driver. with 3.23's in an auto. Was leaning towards the stock manifold


yes that one. Unrelated, the orig bb torker (not the torker 2) reportedly had mixture distribution probs but for sure I'd use the dual plane


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Re: Which intake should I use for my build? [Re: RapidRobert] #937679
02/26/11 08:49 AM
02/26/11 08:49 AM
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Suffolk,VA
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ireland383 Offline
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Sell the Torker and use the dual plane.

Re: Which intake should I use for my build? [Re: ireland383] #937680
02/26/11 09:37 AM
02/26/11 09:37 AM
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I would use the aluminum one. Looks better, runs cooler, is lighter and as you said this is a street only motor...

Trying to squeeze 10lb more tq out of the motor is not that big of a deal on the street.. I would invest in a good converter for that.. Something like the 10" street fighter from TCI...


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Re: Which intake should I use for my build? [Re: VITC_GTX] #937681
02/26/11 09:41 AM
02/26/11 09:41 AM
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Prospect, PA
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I think the stock intake will be better.

I would reconsider your cam choice. Short stroke, low compression, slow moving/large adv. duration cam - makes for very soft bottom end power. Pretty easy to make better one of these.

Re: Which intake should I use for my build? [Re: BSB67] #937682
02/26/11 09:50 AM
02/26/11 09:50 AM
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Quote:

I think the stock intake will be better.

I would reconsider your cam choice. Short stroke, low compression, slow moving/large adv. duration cam - makes for very soft bottom end power. Pretty easy to make better one of these.




wit hthis , the torker is all wrong for that engine as it the cam , if the car was a 4 speed with more gearthen that cam would dork ok , i ran that cam wit hthat gear in a 130k 383 2 bbl engine with a 4speed , it wasn't a barn burner but it was ok.

The build you have laid out is why 383's get a bad rap , use a big cam with a poor single plane intake and it's going to be a dog. What heads do you have ?

Re: Which intake should I use for my build? [Re: JohnRR] #937683
02/27/11 03:01 AM
02/27/11 03:01 AM
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Tri-Cities, Washington
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I have the stock 906 heads for it. They have been rebuilt with MP springs added.

I do have a set of 3.91s I could put in it too, that would help with the low end power.

Looks like I will go with the stock manifold for now. Thanks.

Re: Which intake should I use for my build? [Re: VITC_GTX] #937684
02/27/11 03:09 AM
02/27/11 03:09 AM
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Seattle, WA
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Will you be installing the cam advanced or straight up?

Re: Which intake should I use for my build? [Re: rss] #937685
02/27/11 03:44 AM
02/27/11 03:44 AM
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I assumed straight up. I figured I would just follow the specs. Any reason not to?

Re: Which intake should I use for my build? [Re: VITC_GTX] #937686
02/27/11 04:02 AM
02/27/11 04:02 AM
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Aurora, Colorado
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I would try upping the compression ratio. Maybe use the 0.020" thick steel shim gasket?
I see Summit lists Mopar #P4286754 for $21.95/pair, but out of stock, and says to use Mopar DCC-5155237 which are $159.95
Mr Gasket has the #1135G (0.020" thick) one for $21.95 /each.
What other cams do you have to choose from?

Re: Which intake should I use for my build? [Re: VITC_GTX] #937687
02/27/11 04:21 AM
02/27/11 04:21 AM
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Seattle, WA
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Quote:

I assumed straight up. I figured I would just follow the specs. Any reason not to?




You're planning to use a cam with mid-range power band and 3.23 gears in a low compression 383. Advancing cam should improve low end performance.

I'd run this by others, but based on all my cam-thread lurking, I'd think you'd want to advance it by at least 4 to 6 degrees.

Re: Which intake should I use for my build? [Re: rss] #937688
02/27/11 04:25 AM
02/27/11 04:25 AM
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adv it 4 deg


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Re: Which intake should I use for my build? [Re: RapidRobert] #937689
02/27/11 11:34 AM
02/27/11 11:34 AM
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Central NC
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If you run this cam I agree with above.Advance it 4* and use the iron intake.
You said you have three cams to choose from,what are the other 2?

Re: Which intake should I use for my build? [Re: BSB67] #937690
02/27/11 11:57 AM
02/27/11 11:57 AM
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Quote:

I think the stock intake will be better.

I would reconsider your cam choice. Short stroke, low compression, slow moving/large adv. duration cam - makes for very soft bottom end power. Pretty easy to make better one of these.




+1. I'd use the stock intake. What are your other cam choices?


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Re: Which intake should I use for my build? [Re: zrxkawboy] #937691
02/27/11 03:08 PM
02/27/11 03:08 PM
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I scanned and posted an Edelbrock advertisement on here awhile back. I will try and find the 1973 Hot Rod mag it came from and post it again. The ad from 1973 commented on the latest 440 engines being down on compression and thus power. It then said the adding the Edelbrock "Torker" manifold on one of these low perf 440s really made a big difference in power output. The ad then said if you bolt the Torker on a 66-71 440..."WOW!" was the word they used. Why not try both? The dyno testing done with the Torker in those mag tests in the last decade actually vindicated the Torker and its bad "out dated design" rap.


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Re: Which intake should I use for my build? [Re: 2boltmain] #937692
02/27/11 03:21 PM
02/27/11 03:21 PM
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Kirkland, Washington
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I'd sell both intakes and buy an aluminum dual plane, maybe an EDDY performer (Not RPM) or a MP piece. Slightly better performance than the stocker and saves the weight.

Re: Which intake should I use for my build? [Re: Pacnorthcuda] #937693
02/27/11 03:28 PM
02/27/11 03:28 PM
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Put the cam in around 107-108 ICL, run a performer RPM (the longer runners of the high rise will actually HELP the short stroke ) and I'd go straight to the 3.91's. Use a thin head gasket and mill the heads maybe an additional .020, you have no quench but the extra CR will still help.

Also, opinions vary but with that old general kinetics Summitt grind, a set of Rhoads lifters will actually help take out some of that rather long duration and make that cam a bit snappier.
that is actually a decent oem replacement 440 cam. I don't like the wide spread for a 383 (that really needs help inthe middle), my real preference would be the Crower 271HDP 224/234, .486/.496 but have it custom ground for a 108 centerline (std is 112) and put it in your motor +3 at 105, on paper it's similar specs to the Summit, but it's a much better mopar lobe and it makes a mild 383 run like a scalded dog

The Torker FWIW is a decent 383 4 speed intake, I ran one with a tweaked thermoquad and it was pretty close et wise to a Street Dominator, but that motor had 915 closed chamber heads and 10.5:1, your results might vary. But this was before the RPM dual plane gave us a true high-rise dual plane option, like I said the longer runners (with the right cam especially) will actually enhance torque at a lower rpm with a short stroke motor. And the RPM doesn't have any severe/acute (<90 degree) angles like most of the low rise dual planes have.

Last edited by Streetwize; 02/27/11 03:39 PM.

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Re: Which intake should I use for my build? [Re: Streetwize] #937694
02/27/11 03:37 PM
02/27/11 03:37 PM
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Tri-Cities, Washington
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Thanks to all for the thoughts. I agree I could use better parts but, again, was looking to just use what I have now. I wouldn't mind a stock build but these are the parts I have.

The other two cams I have are the MP purple 238/.474" and the Comp 292H 244/.501".

I think I will try and find the metal shim head gaskets if I can.

What are the drawbacks to advancing the cam?

Re: Which intake should I use for my build? [Re: Streetwize] #937695
02/27/11 03:42 PM
02/27/11 03:42 PM
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Cleveland Ohio
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I hate to hijack ..but I'm building a engine for the Wagon its a 71 440 we are decking the block to raise the comp and it came with 516 heads that were opened up to 2.08 -1.74 and port work was done already we went with a 230 dur/ 525 comp cam and I have a holley street dominator intake for it any opinions on intake etc. We are hoping for 10 to 1 comp.

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