Mopar P4452761 Camshaft

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daddio4048

daddio4048

Daddios72
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Has anybody run this cam in their 340? Good street cam,good idle with a little chop?

Lift 450/455
Duration 268/272
overlap 50
Centerline 108
 
That's likely quite a bit of chop... lol
Pretty long duration and on the low number side of centerline. I doubt you're going to be able to run the stock torque converter in an automatic with it easily. Might have both feet on the brakes at a stoplight...lol
 
Yep it might have a little rumpety-rump. What are you thinking of putting it in @daddio4048 ?

Manufacturer's Part Number:p4452761AE

Part Type:Camshaft Kits

Product Line:Mopar Performance Purple Camshaft Kits

Summit Racing Part Number:DCC-4452761


Cam Style:Hydraulic flat tappet

Basic Operating RPM Range:1,500-5,800

Intake Duration at 050 inch Lift:228

Exhaust Duration at 050 inch Lift:231

Duration at 050 inch Lift:228 int./231 exh.

Advertised Intake Duration:268

Advertised Exhaust Duration:272

Advertised Duration:268 int./272 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:0.450 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:0.455 in.

Valve Lift with Factory Rocker Arm Ratio:0.450 int./0.455 exh.

Lobe Separation (degrees):110
 
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I ran that exact cam in my 68 340 barracuda back in the 1990’s with 9 to 1 compression, low first gear 904 trans with a garbage B & M torque converter and 3.55 gears. Used it as my daily driver for many years. Ran hard and had a great muscle car idle.
 
Fast340cuda said:
I ran that exact cam in my 68 340 barracuda back in the 1990’s with 9 to 1 compression, low first gear 904 trans with a garbage B & M torque converter and 3.55 gears. Used it as my daily driver for many years. Ran hard and had a great muscle car idle.
Click to expand...
Your B&M was probably a Holeshot or Super Holeshot. I put a Holeshot in my 69 Roadrunner and didn't notice much difference over stock. Off topic but converters have come a long ways.
 
I have the 761 cam in a 360 that's in my Challenger conv. It runs great, has a little choppy idle, but my power brakes work fine. I have another 761 cam new in the box that I bought from a member here, and have wondered how well it would work in a 273 that I'm going to build for my 65 Barracuda?
 
toolmanmike said:
Your B&M was probably a Holeshot or Super Holeshot. I put a Holeshot in my 69 Roadrunner and didn't notice much difference over stock. Off topic but converters have come a long ways.
Click to expand...

Yes, it was a B & M holeshot and really didn’t stall any higher than a stock replacement converter. I ended up building another 340 years later with the 284 purple shaft and switched over to a Fairbanks converter. Much higher flash stall but very sloppy on the street.
 
JDMopar said:
I have the 761 cam in a 360 that's in my Challenger conv. It runs great, has a little choppy idle, but my power brakes work fine. I have another 761 cam new in the box that I bought from a member here, and have wondered how well it would work in a 273 that I'm going to build for my 65 Barracuda?
Click to expand...
It will idle like a top fueler in a 273. I bet you could put it in a 408 and it would sound like a stocker. LOL
 
daddio4048 said:
Has anybody run this cam in their 340? Good street cam,good idle with a little chop?

Lift 450/455
Duration 268/272
overlap 50
Centerline 108
Click to expand...
A great street muscle car cam upgrade IMO that should be used with a bit of a converter and as previously mentioned, 3.55’s at a min.
 
Fast340cuda said:
I ran that exact cam in my 68 340 barracuda back in the 1990’s with 9 to 1 compression, low first gear 904 trans with a garbage B & M torque converter and 3.55 gears. Used it as my daily driver for many years. Ran hard and had a great muscle car idle.
Click to expand...

I ran it too from ‘93 to 2011. with stock 340 “10:1 pistons” , X-heads, HP ex manifolds, weiand 8007 dual plane, stock AVS and 600 Holly 1850 carbs, stock 340 converter, 3.23 gear but short tires.

The 1993 version had 110 advertised centerline. I did not degree it and bolted it straight up.

It’s like one step above stock 340 cam. Performs like small step above 340 stock. Idles step above stock 340. Plenty of vacuum.

Seems doggish down low. Maybe if I had put a double pumper of better carb, it would have helped.

By the MP application chart it’s a 14-13.5 sec 1/4 mile time range.

I think other modern cams would be a better choice. Like comp XE268, or Lunti 268.

I wouldn’t run it again.
 
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I have that cam in a low compression 360. Not a real choppy cam at idle, but you can tell it's not stock. Ran 13.85 in the 1/4 with a stock 904 trans/converter and 3.23 gears.
I like the MP 280/474 cam better, but did not want to change the compression/converter/gears etc.
 
I'm sure that’s closer to reality, but I suspect even those numbers are a tad high.

The 2007 catalog shows it as 228/231....... of course that same catalog shows the resto cam is 228/235....... and we all know that isn’t reality.
 
autoxcuda said:
I ran it too from ‘93 to 2011. with stock 340 “10:1 pistons” , X-heads, HP ex manifolds, weiand 8007 dual plane, stock AVS and 600 Holly 1850 carbs, stock 340 converter, 3.23 gear but short tires.

The 1993 version had 110 advertised centerline. I did not degree it and bolted it straight up.

It’s like one step above stock 340 cam. Performs like small step above 340 stock. Idles step above stock 340. Plenty of vacuum.

Seems doggish down low. Maybe if I had put a double pumper of better carb, it would have helped.

By the MP application chart it’s a 14-13.5 sec 1/4 mile time range.

I think other modern cams would be a better choice. Like comp XE268, or Lunti 268.

I wouldn’t run it again.
Click to expand...

Similar to my set-up. I also had x heads, HP manifolds and and the Weiand action plus 8007 intake. Tried 2 carbs, a 650 double pumper and a carter 600 AFB. Mine ran best with the carter.
 
toolmanmike said:
Yep it might have a little rumpety-rump. What are you thinking of putting it in @daddio4048 ?

Manufacturer's Part Number:p4452761AE

Part Type:Camshaft Kits

Product Line:Mopar Performance Purple Camshaft Kits

Summit Racing Part Number:DCC-4452761


Cam Style:Hydraulic flat tappet

Basic Operating RPM Range:1,500-5,800

Intake Duration at 050 inch Lift:228

Exhaust Duration at 050 inch Lift:231

Duration at 050 inch Lift:228 int./231 exh.

Advertised Intake Duration:268

Advertised Exhaust Duration:272

Advertised Duration:268 int./272 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:0.450 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:0.455 in.

Valve Lift with Factory Rocker Arm Ratio:0.450 int./0.455 exh.

Lobe Separation (degrees):110
Click to expand...

Putting in a 340 .030 over,J heads,Fitech fuel injection, 727 trans with B&M holeshot
 
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We tested that cam for Direct Connection back in the day
268 degrees is the same as the 440 Magnum cam but this lobe is fatter even though the lift is about the same (so can use the same HP springs and no machining)
The Magnum has much longer ramps so there is no clickty clack during the warranty period
the lobe centers are obviously squeezed which will give more low end but more emissions
What we found is that this cam is about as big as you can go in a 440 with the stock HP converter and 3.55 gears
anything bigger like the 272 and especially the 284 costs 60 ft times without a converter and even a gear change
DC was never big on .050 - for years never published

"I think other modern cams would be a better choice. Like comp XE268, or Lunti 268."
Modern LMFAO HE268 is a 40 year old Harold Berkshire Chevy grind
Lunati Voodoo is a little later and was designed by Harold for Chrysler not Chevy better choice or you can go a size shorter with same lift as HE268 if you are not running as much compression
 
daddio4048 said:
Has anybody run this cam in their 340? Good street cam,good idle with a little chop?

Lift 450/455
Duration 268/272
overlap 50
Centerline 108
Click to expand...

I used that one in a 318 daily driver and wanted a little more cam....
 
Should be about right. I don't believe in super duper cams with stock heads. My 68 dart 340 9.5 comp. 3.55s and stock converter rpm intake and 750 dp. MP 280 474 ran 13.1. Went to a voodoo 276 234, 242 at .050 .513 and .533 lift no other changes 13.1, Then hughes 237, 243 at .050 and .538 and .542 lift solid 13.05. Ported heads might be another story.
 
I made a mention of an older member that ran 11’s with that “Lazy” teeny time cam. It was a 360 with dead stock 2.02/1.60 heads with only a valve job and matching cam springs. It was a dedicated racecar. Not a every day driver. AKA Light weight.
 
rumblefish360 said:
I made a mention of an older member that ran 11’s with that “Lazy” teeny time cam. It was a 360 with dead stock 2.02/1.60 heads with only a valve job and matching cam springs. It was a dedicated racecar. Not a every day driver. AKA Light weight.
Click to expand...

Was that Tom Hand’s brother in a gold 68 Barracuda coupe? It was featured in Mopar Action or High Performance Mopar mag in the early 90’s.

That got me interested in that cam.

I was 20 years old and just basic tuning ability. It was original piston 68 340 I did a hone, rings, and valve job on with new springs. Cam was install dead up no degree wheel. OE 68 AVS carb and 1850 Holley. 3.23 gear and 235/60/15 Eagle ST rear tires.
 
AutoX, if your asking me, I will have to say Indint think so. Mike Beck lives here in New York.
 
That Detroit standard cam is easy on the valve train and will rpm and live will and the grinds are well done no matter who you get them from
they just cost torque and horsepower in a Mopar and today even in a Chevy
They were designed back when springs were not as good as they are today- even at the same pressures- you had to go easy on the accelerations
too bad the stock cams have such long ramps- the rest of the lobe is better than the Detroit mass produced cams
we used to be able to buy those cams cheaper than buying a new core but hard to make a silk purse out of sow's ear
 
1969reddart said:
According to the paperwork that came with my cam, the duration is 220/224 @.050"
Click to expand...
aaronk785 said:
Should be about right. I don't believe in super duper cams with stock heads. My 68 dart 340 9.5 comp. 3.55s and stock converter rpm intake and 750 dp. MP 280 474 ran 13.1. Went to a voodoo 276 234, 242 at .050 .513 and .533 lift no other changes 13.1, Then hughes 237, 243 at .050 and .538 and .542 lift solid 13.05. Ported heads might be another story.
Click to expand...
More gear and converter, that's what that is telling you. The last cam just accentuates it.
It's not all about lift and if the head flows more or less...its about shifting the torque higher up in the rpm band and YOU not compensating for the loss of torque down low that keeps those 60 ft times down...gear and convertor.
Back on topic, people mostly don't really like that camp because it's barely better than a 340 cam and when you spend $200 and pull your engine apart, buy oil ,break the cam in... and barely feel a difference in the seat of your pants.... yeah people didn't really like that cam much.
 
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