Cam specs for 273?

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easyrider

easyrider

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What are the cam specs for the factory 273 w/ 4 barrel carb? My cam is worn out and i would like to replace it with a hydraulic cam. This is not a hotrod, just a cruzer. I have a 5.9 that i plan on putting in it, but i won't have time before mopars at the battleship. I'm going to just replace the cam / lifters and get it back running. What cam and lifters? What about push rods?

Tom
 
Camshaft 'Mechanical'

Lift.......... .420" Intake / .430" Exhaust
Duration.... 248*
Overlap...... 26*

Valve Springs
Valve Closed ....... #83 to #92 lbs. @ 1.69"
Valve Open ........ #185 to #194 lbs. @ 1.28"
 
69 Cuda 440 said:
Camshaft 'Mechanical'

Lift.......... .420" Intake / .430" Exhaust
Duration.... 248*
Overlap...... 26*

Valve Springs
Valve Closed ....... #83 to #92 lbs. @ 1.69"
Valve Open ........ #185 to #194 lbs. @ 1.28"
Click to expand...


You are off on the lift:

66/67 273 4bbl cam:

248/248 Dur
16° Overlap
.415"/.425" lift

IVO: 14
IVC: 46
EVO: 58
EVC: 2
 
if it were me, I would try to find a cam that will also work with the 360 you are planning on dropping in there
(no point in buying 2 of em)
 
Krazy Kuda

NHRA Specifications

1965 ~ 273/235 HP
Lift ........... .415" / .425"
Duration..... 248*
Overlap...... 26*

1966/1967 ~ 273/235 HP
Lift .......... .420" / .430"
Duration.... 248*
Overlap..... 26*
---------------------------------------------------------------

From the 'Mopar Book' with the superseded {Part #2465679}

Lift........ .425"
Duration.. 248*
Overlap... 26*
_________________________________________________________
 
The isky E-4 cam is about as close to stock as you will find. Plus it's a solid cam as
well! Why go hyd??? It works awesome in these hi-po 273's plus all the valve gear you all ready have. I have that cam & 1.6 rockers & couldn't be happier with it.
 
easyrider said:
What are the cam specs for the factory 273 w/ 4 barrel carb? My cam is worn out and i would like to replace it with a hydraulic cam. This is not a hotrod, just a cruzer. I have a 5.9 that i plan on putting in it, but i won't have time before mopars at the battleship. I'm going to just replace the cam / lifters and get it back running. What cam and lifters? What about push rods?

Tom
Click to expand...

The stock spec HP cam is no longer produced but many of us use the Isky E-4 cam which has similar specs. Replacement lifters may be different and may require different pushrods. You can also install a mild hydraulic cam, lifters, and shorter pushrods. Comp Cams # 249-7821-16
pushrods are the ones you need for a hydraulic cam with adjustable rockers. tmm
 
I spent a few minutes looking at my factory service manual and couldn't find cam specs. I have seen 248/425 and 248/415/425. The overlap specs are all over the map too. I would like to see the specs in factory print to be sure. tmm
 
Mike, what are the specs on the E4?
 
toolmanmike said:
I spent a few minutes looking at my factory service manual and couldn't find cam specs. tmm
Click to expand...


They are in the very back of the 65 Plymouth manual.

In the back of engine chapter 9 for 66 and later.

The cam duration specs are in the camshaft section.

The lift is at the bottom of the valve spec section for each valve, intake & exhaust....
 
krazykuda said:
They are in the very back of the 65 Plymouth manual.

In the back of engine chapter 9 for 66 and later.

The cam duration specs are in the camshaft section.

The lift is at the bottom of the valve spec section for each valve, intake & exhaust....
Click to expand...

Found them! Thanks for the clarification KK. So the correct specs are 248° duration, 26° overlap ,
.415 intake lift, .425 exhaust lift. tmm
 
And dont be afraid of the solids. After the break-in they hold their adjustment for a long time.
-And dont let anyone talk you into a hot 360 cam,to reuse later.
-I have run the 340 cam in a low c/r 318. Not the smartest idea I ever had.It runs real good in an older 318 with closed chamber heads though,(with a rear gear change).
-A 2bbl 360 cam might work ok in a 318. In your 273 I cant say.I only ever had one 273,and kept it stock. Of course being the guy I am, Id try a used one, since I already have it.
 
69 Cuda 440 said:
Krazy Kuda

NHRA Specifications

1965 ~ 273/235 HP
Lift ........... .415" / .425"
Duration..... 248*
Overlap...... 26*

1966/1967 ~ 273/235 HP
Lift .......... .420" / .430"
Duration.... 248*
Overlap..... 26*
---------------------------------------------------------------

From the 'Mopar Book' with the superseded {Part #2465679}

Lift........ .425"
Duration.. 248*
Overlap... 26*
_________________________________________________________
Click to expand...

Right from the '1967' Mopar High-Performance Book.

New cams are to follow the above profile.
 
69 Cuda 440 said:
Right from the '1967' Mopar High-Performance Book.

New cams are to follow the above profile.
Click to expand...


Your source is wrong.... Maybe a rounding error or a typo... :evil3:


Here is the 67 Dodge service manual, same specs as I have shown above for the 65 & 66 4 bbl cam.

View attachment 67 Dodge B01 C.jpg

View attachment 67 Dodge B02 C.jpg


There's three CHRYSLER sources showing consistency with what I've posted. So are you saying that YOUR book is more accurate?



The street's closed pizza boy, find another way home....


[ame]http://youtu.be/qyTj4WnPE9M[/ame]
 
Krazy

Check the NHRA Engine Blueprint Guidelines.

1965 ......................... .415" / .425"

1966 and 1967 ........... .420" / .430"


Then, go get your 'Shine Box'.
 
Oh, lookey here !

1965 Chrysler High Performance Catalog

Part #2465679 ......... Cost $26.50

273 4-Barrel Camshaft ......... .425" Lift / 248* Duration / 26* Overlap

Catalog 81-60-0700 {2-65} P-3983-C
 
69 Cuda 440 said:
Oh, lookey here !

1965 Chrysler High Performance Catalog

Part #2465679 ......... Cost $26.50

273 4-Barrel Camshaft ......... .425" Lift / 248* Duration / 26* Overlap

Catalog 81-60-0700 {2-65} P-3983-C
Click to expand...


This is the correct lift for the exhaust...

Your lift for the 66 & 67 are not what ALL of the service manuals say....

Like I pointed out, it could just be a round off error, bit it is not accurate...


Why is it so hard for you to admit that you were wrong???? Just once???? :wack:
 
Krazy

I guess the NHRA Specifications are incorrect as well.

1965 ........................ .415" Intake / .425" Exhaust
1966 and 1967 .......... .420" Intake / .430" Exhaust

That's not 'rounding off'.
 
69 Cuda 440 said:
Krazy

I guess the NHRA Specifications are incorrect as well.

1965 ........................ .415" Intake / .425" Exhaust
1966 and 1967 .......... .420" Intake / .430" Exhaust

That's not 'rounding off'.
Click to expand...



They don't match the three service manuals that I checked and posted....

Those three service manuals are all available for free download on the mymopar.com site. Feel free to download them yourself and look.


Out of respect to the original poster, I am not going to hijack his thread to argue this any further.

Good Day...

View attachment Grumpy Baby A05.jpg
 
It's .005". Who gives a ****?
 
Come on guys, We have to trust Ma Mopar. As we all know NHRA has a history of manipulating specs to fit their criteria. If you were to blueprint a 273 to factory specs, You would use factory specs and not NHRA guidelines. tmm
 
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