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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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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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.
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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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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
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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]
#2035180
03/20/16 05:51 PM
03/20/16 05:51 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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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").
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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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Joined: Apr 2006
Posts: 1,009 Central US
grancuda
OP
super stock
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OP
super stock
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Central US
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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
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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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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
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usa
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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"). i wouldn't be afraid of that howards cam, but might consider it close to the limit for decent driving and no tuning nightmares.
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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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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
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Jacksonville, FL
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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.
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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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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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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
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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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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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Mt. Eden Ky.
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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.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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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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Joined: Apr 2006
Posts: 1,009 Central US
grancuda
OP
super stock
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OP
super stock
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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
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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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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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Sobieski Wi
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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.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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