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Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2034809
03/20/16 12:53 AM
03/20/16 12:53 AM
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Brisvegas, Australia
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Ok for starters the steel shim gasket probably is not going to fit unless after cutting you have the worlds tallest deck height "b" block produced - the min piston to head clearance should be in the 30-35 thou region, the steel shim is .020

Once you have your actual piston to deck height, use an online dynamic compression calculator - the static compression you need will be determined by the cam duration or vice versa - the dynamic ratio should not be more than 8.2ish for premium fuel (subject to debate for ally heads)

fast68's advice is pretty good

There are a few recent threads on squish and quench on here and plenty on the web otherwise, check out dcr vs scr too

An additional issue with stock rockers on any aftermarket head - the stock rockers are closer to 1.4 ratio, not the 1.5 ratio the cam specs are rated at - the ally heads flow much better at higher lift, Ideally some new rockers would help to achieve that lift - check out other Hughes and Howards cams grinds either side of the one mentioned too

Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: Chris2581] #2035026
03/20/16 01:31 PM
03/20/16 01:31 PM
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Originally Posted By Chris2342
I'm tellin' ya that 284/484 cam works great in a 383.

For some combinations I'm sure it does. Maybe I built an underperforming one for other reasons, but if I was building a new engine today for the same car, I'd try something different.

Last edited by BradH; 03/20/16 01:35 PM.
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2035053
03/20/16 02:19 PM
03/20/16 02:19 PM
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Weddington, N.C.
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I still like the Crower 271HDP the best or Fast's pick (which is pretty dead-nuts similar)

Another great hot 340 or 383 Hydraulic cam with at least 10:1 is the old Ultradyne 231/239 on a 108 spread, bullet can still grind it.

I had the "Old" .471/.474 Street Hemi grind Purple shaft in a 383 4 speed way back 35 yrs ago and it ran surprisingly well in a Big B body with 3.55 gears.

I would imagine the .484 would be ok with a decent 3000 stall and 3.91's, it ran good enough for high 11's (7.50's in the 1/8th) in a well built 440 in my buddy's E body cuda in late 80's and low 7s (mid 11's) in my 73 duster on a stock 69 short block with ported 906's.

383's are just kinda soft out of the hole (below about 2800-3000) but that actually used to be an advantage on street tires back in the day.

If I HAD to build a B motor with stock bore and stroke I know today I would build a 4.375" bore 400 but with the longer 6.76" 440 rods which would allow you to run a ~1.53" CH piston which is the same slug you would use for a 4.15" stroke RB using 7.100 rods. you would need to bush the little end "old school" style to .990 BBC pin to do that so it might be easier to just go aftermarket rods anyway. That would be nice revving 406" motor with a much lighter bob weight.

Last edited by Streetwize; 03/20/16 02:28 PM.

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Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2035134
03/20/16 04:11 PM
03/20/16 04:11 PM
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Someplace you aren't
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Why the shorty headers? Packaging concerns with the chassis?


I want my fair share
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2035180
03/20/16 05:51 PM
03/20/16 05:51 PM
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So. Burlington, Vt.
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My only "issue" with the crower 271 in this application is the large amount of split in duration.
It's good with nearly stock heads and the weaker exhaust flow, but edelbrock exhaust ports are much better than stock, and on a smaller displacement combo like a 383 I think there would be a possibility of over-scavanging, although it probably wouldn't be much of an issue with shorty headers and closed exhaust(however tightening that cam to a 108lsa along with the longer exhaust event does create even more overlap, which may not really be your best friend with a less than optimal exhaust system).
Also, the Crower 271 ground on a 108, which is a custom, I'm guessing will cost a bit more than the $127 Competition Products sells that Howard's Rattler for(and is shown as "in stock").

Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: SomeCarGuy] #2035200
03/20/16 06:26 PM
03/20/16 06:26 PM
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Central US
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Originally Posted By SomeCarGuy
Why the shorty headers? Packaging concerns with the chassis?


The car came with a set new in the box. I usually run full length but this car had these with it. Wish the guy would have bought full length TTI's I had good luck with those on a past '69 Dart. Guess I could sell them & pick up some full length headers, just don't know if it would affect the hp enough to justify the added cost.


1967 Barracuda Formula S 383
1967 Chevy C10 Short Stepper
1980 Macho Power Wagon LWB 318
2021 Toyota Supra
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: fast68plymouth] #2035208
03/20/16 06:37 PM
03/20/16 06:37 PM
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Originally Posted By fast68plymouth
My only "issue" with the crower 271 in this application is the large amount of split in duration.
It's good with nearly stock heads and the weaker exhaust flow, but edelbrock exhaust ports are much better than stock, and on a smaller displacement combo like a 383 I think there would be a possibility of over-scavanging, although it probably wouldn't be much of an issue with shorty headers and closed exhaust(however tightening that cam to a 108lsa along with the longer exhaust event does create even more overlap, which may not really be your best friend with a less than optimal exhaust system).
Also, the Crower 271 ground on a 108, which is a custom, I'm guessing will cost a bit more than the $127 Competition Products sells that Howard's Rattler for(and is shown as "in stock").
i wouldn't be afraid of that howards cam, but might consider it close to the limit for decent driving and no tuning nightmares.

Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2035266
03/20/16 08:07 PM
03/20/16 08:07 PM
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So. Burlington, Vt.
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I agree Lew, it's on the big end of the spectrum IMO.
Another slightly friendlier option would be a comp xe268 or lunatis version of it. I'm just not a big fan of hydraulic and "fast rate". Some love em and have good luck with them but my experiences with fast rate hyd cams have always left me feeling like I would have been better off with something else.
Howard's also has a fast rate hyd grind that would be good for this application, 721141-08.
267/267, 220/220, .506/.506, 108lsa.
I'm sure it would work really well up to the limiting rpm of the lifters.

Edit: I went back and re-read the original post....... I still think the small Howard's rattler would be what I'd use.

Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: Streetwize] #2035462
03/21/16 12:09 AM
03/21/16 12:09 AM
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Jacksonville, FL
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Originally Posted By Streetwize

I had the "Old" .471/.474 Street Hemi grind Purple shaft in a 383 4 speed way back 35 yrs ago and it ran surprisingly well in a Big B body with 3.55 gears.


Too bad Mopar doesn't make this cam anymore,as this is the one I would use easily. I still have it in my 70 383 Road Runner today. My Dad bought the cam new in 1972,and we ran as fast as 12.20 @109.88 with the usual bolt on's.


Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2035661
03/21/16 12:39 PM
03/21/16 12:39 PM
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So. Burlington, Vt.
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Looking at the old DC engine book, the old street hemi grind was 284 duration with a 108lsa and .471/.474 lift.
Not really all that different than the small Howard's Rattler.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: fast68plymouth] #2035833
03/21/16 04:50 PM
03/21/16 04:50 PM
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Weddington, N.C.
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I think the old .471/.474 cam was around 228 @.050, worked really well in my 383 for what it was.

Fast I agree on the 271HDP it's a great stock replacement cam in a 440 magnum and a great hot street cam with a 383 4 speed.

I'm with you on the 108 but the shorter stroke motors seem to benefit more from the tighter spreads in that the torque comes in faster and harder (which 340's and 383's really tend to need). The boost in the mid range seems to more than compensate ET wise to what the tighter spread costs them in terms of top end power, at least that was the case with smaller stock type heads. And a lot of the modern aluminum heads flow well enough on the exhaust that they might be as well (or better) with street exhaust to just run a single pattern cam where they would have the near same effective overlap with a tighter LSA than a longer exhaust with a wider spread.


WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: Streetwize] #2035973
03/21/16 08:37 PM
03/21/16 08:37 PM
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I know Mopar also used to have a hyd cam that was 280 duration and .474 lift on both lobes and was 60 degrees overlap. They said to install it on a 106 ICL. It was for a big and smallblock as I used it once in a very stock 340 Dart and it ran very nice. Ron

Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2036070
03/21/16 10:45 PM
03/21/16 10:45 PM
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I have the Comp XE 268 in my 68 road runner 383 engine. It has been in there for about 15 plus years, and 25K + miles.
The rest of the engine is completely original other than it has .030 dish pistons. I am sure the compression ratio is very low with the original 906 heads. I did not square deck the block.
I had a purple shaft in this combination and it was a total dog. No vacuum, poor in gear idle etc.
That cam was DC-280-110. Specs are 280* .474 106* with 60* overlap.
The road runner has a 727 with 3.23 gears.
I think this engine with the flat tops and other items the OP listed, along with the 4.10 gear would be a lot of fun!

Mark

Last edited by Hemi Allstate; 03/22/16 02:03 PM.

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Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2045786
04/03/16 11:20 PM
04/03/16 11:20 PM
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Central US
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On this HotRod article they picked a cam with a 110 sep. but they degreed it at 4 deg advance. I bought the 3 bolt so I could check the degree but should I be looking to advance when I do install? Ordering a can this week & looking at all the options.

http://www.hotrod.com/how-to/engine/mopp-0209-383-engine-restore/

Also, last week I got the heads, a set of Eddelbrock E-Street heads. Hoping to get the motor back from the machine shop this week.


1967 Barracuda Formula S 383
1967 Chevy C10 Short Stepper
1980 Macho Power Wagon LWB 318
2021 Toyota Supra
Re: Cam Selection - strong street 383 w/Edelbrock 75cc heads [Re: grancuda] #2294783
04/27/17 12:22 AM
04/27/17 12:22 AM
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Just bringing up an old thread

I am running the 284 - 484 cam with those E - Street Heads installed on my numbers matching 383

Should have it fired up this weekend

To much detailing along with work , slow project

Interested on what you went with and how everything turned out

Last edited by bee1971; 04/27/17 12:24 AM.

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