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FACTORY CYLINDER THEORY AND CAM SPECS #2689044
08/18/19 11:41 AM
08/18/19 11:41 AM
Joined: Oct 2008
Posts: 912
East Coast
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A/MP Offline OP
super stock
A/MP  Offline OP
super stock
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Joined: Oct 2008
Posts: 912
East Coast
I have some knowledge of Chrysler theory for the swirl port head design. Cam height reflects what Chrysler envisioned for the flow of these heads. Looking at the specs for 360-4 stock eliminator cars there 2 cam specs denoted as SC (small cam .423*/423*) and BC(.462/.473). Any duration is acceptable. Using the same head w/ or w/o "stock head being stock" the small cam performs better. What's going on here?

Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: A/MP] #2689071
08/18/19 12:59 PM
08/18/19 12:59 PM
Joined: Jan 2003
Posts: 12,261
So. Burlington, Vt.
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fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
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Joined: Jan 2003
Posts: 12,261
So. Burlington, Vt.
I’m not sure what you’re saying, but the fastest of the SB Mopar Stockers all use the high lift cam....... the C/D/E/F cars.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: A/MP] #2689089
08/18/19 02:03 PM
08/18/19 02:03 PM
Joined: Oct 2007
Posts: 3,290
New York
polyspheric Offline
master
polyspheric  Offline
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Joined: Oct 2007
Posts: 3,290
New York
The Chrysler cam design has many more variables than max power with a specific port. Included is the always popular "how cheaply can we make it".


Boffin Emeritus
Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: fast68plymouth] #2689102
08/18/19 02:41 PM
08/18/19 02:41 PM
Joined: Oct 2008
Posts: 912
East Coast
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A/MP Offline OP
super stock
A/MP  Offline OP
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Joined: Oct 2008
Posts: 912
East Coast
That the 340's. The 360's are in the H/I class and they are allowed to use the swirl port heads.I'm looking for a cam that will work with stock head and achieve the most power, trackwise.

Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: A/MP] #2689163
08/18/19 07:26 PM
08/18/19 07:26 PM
Joined: Aug 2003
Posts: 33,400
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 33,400
Bend,OR USA
I'm almost sure that Mopar went to the smaller lift cams in 1972 they also went to the smaller valves in the 340 heads and lowered the compression ratio also shruggy scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: Cab_Burge] #2689974
08/21/19 10:57 AM
08/21/19 10:57 AM
Joined: Feb 2016
Posts: 94
PA
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Scully Offline
member
Scully  Offline
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Joined: Feb 2016
Posts: 94
PA
The cam was the same till at least 74, all the factory specs are listed here. http://www.nhraracer.com/content/general.asp?articleid=46634&zoneid=132

Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: Scully] #2689994
08/21/19 11:57 AM
08/21/19 11:57 AM
Joined: Feb 2006
Posts: 481
TN and CA
1DGEMAN Offline
mopar
1DGEMAN  Offline
mopar

Joined: Feb 2006
Posts: 481
TN and CA
Any body that has run a Stock Eliminator 340 knows those cam specs were Mopars imagination. In 72 the piston went from .045 above to .054 down. head gasket went from .032 to .036 and intake valve went from 303 to 1.88.


Real Men shift for themselves
Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: 1DGEMAN] #2690409
08/22/19 05:20 PM
08/22/19 05:20 PM
Joined: Aug 2007
Posts: 481
El Dorado Ca
65signet Offline
mopar
65signet  Offline
mopar

Joined: Aug 2007
Posts: 481
El Dorado Ca
I believe the ports on the 308 heads are smaller than the earlier heads, and its more about velocity in the port regardless of of lift, and the duration is what makes the power. just my opinion.


1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 318/904
1973 Plymouth Duster
1968 Plymouth Barracuda fastback
Re: FACTORY CYLINDER THEORY AND CAM SPECS [Re: 65signet] #2690443
08/22/19 07:42 PM
08/22/19 07:42 PM
Joined: Jan 2003
Posts: 5,643
Melbourne , Australia
LA360 Offline
master
LA360  Offline
master

Joined: Jan 2003
Posts: 5,643
Melbourne , Australia
It would be the valve timing events that make the power, rather than the lift


Alan Jones

Cleanmedia
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