Cam specs for 273?

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toolmanmike said:
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
Click to expand...

T-M-M,

Then I assume, you would only use Mopar factory produced parts.

Because if you did, you would find that the 273 Camshaft did not spec out
to what they printed.
 
69 Cuda 440 said:
T-M-M,

Then I assume, you would only use Mopar factory produced parts.

Because if you did, you would find that the 273 Camshaft did not spec out
to what they printed.
Click to expand...

Ok. And your specs are correct over the factory specs how?
 
krazykuda said:
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 1714784234

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

Hey KK...interesting trivia....if you look under "2bbl Canada", it says that Ma used the 273 4bbl camshaft (in hydraulic config.) in 318 2 bbl Canadian motors!!!...Cool!!! I wonder if you can still order one that way?
 
Wow! Well since the (....correct.....) profile is with the dinosours,again if you want the closest thing possible that works great the isky E-4 is what ya need! It's the smallest solid flat tappet around & is close as possible to stock hi-po cam. .005 thou diff???? There's that much differ in one guy's to the other's lash setting! The edelbrock proformer cam is close to that for a hyd. Cam .205 205 @ .050 (ish) & .420 .420 lift. It's pretty tame in a low comp 318.
 
I've got a cam that I pulled from a 30, 000 mile 66 Barracuda years ago and have been saving for a rainy day. ( My buddy just had to have an Isky cam. For the decal mostly I think....but I got the cam for labor payment) I just threw it in the blocks and it dialed 276 and 283.
 
Mathematically, with a 1.5 ratio rocker that calculates to .414/.424 . That's damn close to the .415/.425 out of the service manual. Case closed. Thanks grimreaper.
 
Two7T3Dart said:
Hey KK...interesting trivia....if you look under "2bbl Canada", it says that Ma used the 273 4bbl camshaft (in hydraulic config.) in 318 2 bbl Canadian motors!!!...Cool!!! I wonder if you can still order one that way?
Click to expand...


Yes, funny that you mention that. I've just started going through my service manuals and am putting together a spread sheet to document all of the different stock cams that came in the engines.

I've found a few typo's here and there, but I'm trying to figure out which are typos and how to correct them.

I just checked my sheet, you have to look carefully at that cam, it's not the 273 4 bbl cam, but it is close. The 273 4 bbl cam was a mechanical cam with the same duration, but different lift. The 318 cam is hydraulic and has the same IVO, IVC, EVO, EVC as the 273 4 bbl cam, but the lifts are different. The 273 mechanical cam has .415/.425 lift, where the hydraulic cam has .390" lift. So they are close, but still different....
 
69 Cuda 440 said:
Krazy Looney

Are you aware, that the Manuals are printed way in advance.

And that minor changes in the Specifications are not found in the
Standard Manual.

Check the 'superseded printing'.

"Check the tower logs, for God's sake."

https://sp.yimg.com/ib/th?id=HN.608019377847143274&pid=15.1&P=0
Click to expand...


I am aware of how the manuals are written.

They also have a mid year revision. If an engineer catches a mistake or changes the spec of a part, they can have it "corrected" or updated in the new mid-year revision.
 
69 Cuda 440 said:
The NHRA must be 'idiots' then, for listing the 1966 and 1967 {273/235 HP}
with a .420" Intake and .430" Exhaust Lift.

I'll call them and tell them that.
Click to expand...


Why does it have to resort to name calling?

Someone made a mistake, that's it. Plain and simple. Why do we have to call them a name for making a mistake. It's a mistake, just make note of it, correct it, and move on....


Don't take it so personally.



Oh, excuse me, I have a customer....

A Slurpee and some nachos, that'll be $5 sir.....
 
toolmanmike said:
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
Click to expand...


Exactly.... :D
 
Iskenderian E-4

Part #390144

'Mechanical' {2000 to 5500 RPM's}

Lift.......................... .425"/.425"
Duration .................. 260*/260*
Duration @ ..050" .... .216*/216*
Overlap..................... 44*
Centerline................. 108*
Lash ....................... .015"/.015"

Isky Notes;
* Tremendous torque, with good mid-range power.
* A Camshaft that 'duplicates' the stock lift, but with added duration.
* Good idle for a Stock Converter.
* Works best with a 600 CFM Carburetor.
* Recommended Rear-End Gear range from {3.23 to 3.70}
* For Engines with {9.5 to 10.5} Compression Ratio pistons.
 
krazykuda said:
Is that hydraulic or mechanical?
Click to expand...

Mechanical

69 Cuda 440 said:
Iskendarian E-4

Part #390144

'Mechanical' {2000 to 5500 RPM's}

Lift.......................... .425"/.425"
Duration .................. 260*/260*
Duration @ ..050" .... .215*/215*
Overlap..................... 32*
Centerline................. 108*
Lash ....................... .015"/.015"

Isky Notes;
* Tremendous torque, with good mid-range power.
* A Camshaft that 'duplicates' the stock lift, but with added duration.
* Good idle for a Stock Converter.
* Works best with a 600 CFM Carburetor.
* Recommended Rear-End Gear range from {3.23 to 3.70}
* For Engines with {9.5 to 10.5} Compression Ratio pistons.
Click to expand...

Just to show how specs can change, Isky's website lists duration @ .050 at 216° as does the cam sheet that came with my cam. Their website lists valve lash at .015 where as the cam sheet says .020. Iskenderian is spelled with a "e" in the middle.
 
toolmanmike said:
Mechanical



Just to show how specs can change, Isky's website lists duration @ .050 at 216° as does the cam sheet that came with my cam. Their website lists valve lash at .015 where as the cam sheet says .020. Iskenderian is spelled with a "e" in the middle.
Click to expand...

Thanks.


Yes, they have to be meticulous with their numbers or they create alot of confusion... #-o

I've found some discrepancies in the specs from the service manuals. Some from one year to another, some one manual to another (like Dodge Dart Charger Coronet manual vs same year Dodge Polara Monaco info). One lists the 383 HP compression at 10.0, the other at 10.1.... They really mixed up the info in 67 from Plymouth to Dodge manuals, and vs the same year Imperial or Polara Monaco manuals.... :banghead:
 
69 Cuda 440 said:
Iskenderian E-4

Part #390144

'Mechanical' {2000 to 5500 RPM's}

Lift.......................... .425"/.425"
Duration .................. 260*/260*
Duration @ ..050" .... .216*/216*
Overlap..................... 44*
Centerline................. 108*
Lash ....................... .015"/.015"

Isky Notes;
* Tremendous torque, with good mid-range power.
* A Camshaft that 'duplicates' the stock lift, but with added duration.
* Good idle for a Stock Converter.
* Works best with a 600 CFM Carburetor.
* Recommended Rear-End Gear range from {3.23 to 3.70}
* For Engines with {9.5 to 10.5} Compression Ratio pistons.
Click to expand...

The Duration @ .050" Lift is listed as you stated, at 216*.

And the Overlap is listed at 44*.

'Isky' did recommend an additional {+.06" Lash} for the Exhaust Valve,
bringing the Gap to .021".
 
69 Cuda 440 said:
Iskendarian E-4

Part #390144

'Mechanical' {2000 to 5500 RPM's}

Lift.......................... .425"/.425"
Duration .................. 260*/260*
Duration @ ..050" .... .216*/216*
Overlap..................... 32*
Centerline................. 108*
Lash ....................... .015"/.015"

Isky Notes;
* Tremendous torque, with good mid-range power.
* A Camshaft that 'duplicates' the stock lift, but with added duration.
* Good idle for a Stock Converter.
* Works best with a 600 CFM Carburetor.
* Recommended Rear-End Gear range from {3.23 to 3.70}
* For Engines with {9.5 to 10.5} Compression Ratio pistons.
Click to expand...


Thanks for the info.

Now compare to the service manual specs for the 273 4 bbl cam:

IVO: 14 BTC
IVC: 54 ABC
EVO: 56 BBC
EVC: 12 ATC

Olap: 26
Dur Int: 248
Dur Exh: 248

CL Int: 110°
CL Exh: 110°
Lobe Sep: 110°
 
Back-in-the-Day

The Iskenderian 'E-4' was recommended for the 'Street Automatics'.

The Racer Brown 'ST-2' was recommended for the 'Street 4-Speeds'.
 
Poor Tom. He just wanted a little cam to slam into his littleLA so he could go to a big show.
Sometimes this forum is a fun, informative, great place to be.Sometimes a guy just wants to crawl under a rock and hide.
So Tom, did you get a sense of what cam to buy?
 
Krazykuda, here's the spec sheet you asked for. The E-4 is cam #390144.
 

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That is enough info to confuse any shade tree grease monkey like me!!!!

I think I'll use the E-4 and be done with it.

Thanks to all who responded.

Tom
 
easyrider said:
That is enough info to confuse any shade tree grease monkey like me!!!!

I think I'll use the E-4 and be done with it.

Thanks to all who responded.

Tom
Click to expand...

You bet Tom. We get in too deep sometimes and I apologize for that. The E-4 was my first choice because of the similar specs to stock. It works well. tmm
[ame="https://www.youtube.com/watch?v=ARQ9WrSP0xk"]008 2 - YouTube[/ame]
 
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