I believe the 0.050 stuff came out way later than what AMC used in their
specs.

On Thu, 24 Jul 2008 20:43:15 -0400 David Crooks
writes:
>
> > Thanks for the information.? Do you know if the 266* duration is
>
> advertised or at 0.050" lift (I assume advertised)?? Thanks.
>
> The TSM isn't specific about it, I gave all the specs that were
> there,
> but I have no doubt that it's advertised.
>
>
> _______________________________________________
> Amc-list mailing list
> Amc-list at amc-list dot com
> http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list
>
>

Jock Jocewicz - President/Editor NAMDRA NAMDRA at juno dot com or
namdra1 at aol dot com
8537 Antioch Rd., Salem, WI 563168 (262) 843-4326
JOIN NAMDRA - the best AMC club around!!
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AMO#19, NAMDRA#46, AMCRC#974, NHRA#41915, IHRA#6766
____________________________________________________________
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Thanks for the added input, gents!

Sincerely,
Greg Taylor :) <><
Rochester Hills, MI
1989 Jeep Grand Wagoneer "TRMN8R2"

And the testimony is this, that God has given us eternal life, and this life is in His Son. He who has the Son has the life; he who does not have the Son of God does not have the life. - 1 John 5:11-12

--- On Fri, 7/25/08, Jock J JocewJ Jocewicz wrote:

From: Jock J JocewJ Jocewicz
Subject: Re: [Amc-list] Need Cam Specs for High compression
To: amc-list at amc-list dot com
Date: Friday, July 25, 2008, 1:35 AM

I believe the 0.050 stuff came out way later than what AMC used in their
specs.

On Thu, 24 Jul 2008 20:43:15 -0400 David Crooks
writes:
>
> > Thanks for the information.? Do you know if the 266* duration is
>
> advertised or at 0.050" lift (I assume advertised)?? Thanks.
>
> The TSM isn't specific about it, I gave all the specs that were
> there,
> but I have no doubt that it's advertised.
>
>
> _______________________________________________
> Amc-list mailing list
> Amc-list at amc-list dot com
> http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list
>
>

Jock Jocewicz - President/Editor NAMDRA NAMDRA at juno dot com or
namdra1 at aol dot com
8537 Antioch Rd., Salem, WI 563168 (262) 843-4326
JOIN NAMDRA - the best AMC club around!!
30th. AMC NATIONALS - SEP.11-13. 2008 - CORDOVA DRAGWAY PARK
AMO#19, NAMDRA#46, AMCRC#974, NHRA#41915, IHRA#6766
____________________________________________________________
Click here to find Medical Transcription Training programs.
http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3nFN9YRoPbMN32quYZcDWtuRycYGISgwBNVn0GaVqCR5CtlU/
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One more related question, it appears that AMC used the same cam for ALL engines, regardless of compression ratio and CID size, is this the general case (I've see a 'few' exceptions noted for later 401s).  Thanks.

Sincerely,
Greg Taylor :) <><
Rochester Hills, MI
1989 Jeep Grand Wagoneer "TRMN8R2"

And the testimony is this, that God has given us eternal life, and this life is in His Son. He who has the Son has the life; he who does not have the Son of God does not have the life. - 1 John 5:11-12

--- On Thu, 7/24/08, David Crooks wrote:

From: David Crooks
Subject: Re: [Amc-list] Need Cam Specs for High compression
To: amc-list at amc-list dot com
Date: Thursday, July 24, 2008, 8:43 PM

> Thanks for the information.? Do you know if the 266* duration is
advertised or at 0.050" lift (I assume advertised)?? Thanks.

The TSM isn't specific about it, I gave all the specs that were there,
but I have no doubt that it's advertised.

_______________________________________________
Amc-list mailing list
Amc-list at amc-list dot com
http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list

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> One more related question, it appears that AMC used the same cam
for ALL engines,
> regardless of compression ratio and CID size, is this the general
case

I was a bit surprised to notice that in the '69 TSM, I would have
thought that not adjusting the cam
to the engine displacement would move the torque peak around more than
you might want.

On the other hand, it's certainly cheaper to make one cam fit all!

They did use a different cam in the '70 390 though, from the TSM:

Intake Cam Lobe Lift 0.287"

Intake Valve Timing
Opens 18 degrees BTDC
Closes 68 degrees ABDC
Duration 266 Degrees

Exhaust Cam Lobe Lift 0.287"

Exhaust Valve Timing
Opens 66 degrees BBDC
Closes 20 degrees ATDC
Duration 266 degrees

Valve Opening Overlap 38 degrees

A little more lift, and less overlap, same duration.

I only have those two TSM's, so I can't speak for other years.
There's a line in
"Performance American Style", which AMC produced, describing their cams:
"none have outstanding performance characteristics". I think that
pretty much
says it all!

Cheers,
Dave
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Aren't there Group 19 cams? I have one of those AMERICAN PERFORMANCE
booklets if that's of any help.
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AMC used a standard for measurement that was common to the automotive industry during that time of rating the camshaft measurements at .004" tappet rise. The .425" lift spec was used for the the duration of 1966-1979 production. Maybe later, but I have not been able to uncover documentation to support it. A major difference in timing, however, occured in 1971. Seems they were having trouble getting the engines to pass new fed emissions requirements, so the changed up the events and lift rate of the camshaft. The pre-71 and early 71 camshafts were 196 degrees at .050" (266 degrees advertised), the "smog" cam specs were 202 degrees duration @.050" (263 advertised) on the intake, 214 degrees @ .050" (293 advertised) on the exhaust. Also, the overlap was reduced to 38 degrees at .050". The '70 390 and 401 cam had 297 degrees intake duration, 304 degrees exhaust duration, and 69 degrees overlap, with .457" lift at the valve, advertised.