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Post By bobcowan
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04-20-2026, 06:42 AM
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Join Date: Aug 2006
Location: Jacksonville,
Fl
Cobra Make, Engine: Just a collection of parts right now...
Posts: 304
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General questions
Do Weber carbs require high compression or is 9.6ish OK? Will Webers perform OK with a solid lifter hipo reproduction cam?
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04-20-2026, 08:18 AM
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,459
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Compression doesn't really matter.
Any IR system does better with a wide LSA, at least 112*. Less than that, and you tend to get a lot of reversion. That's what caused the "Weber Cloud".
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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04-21-2026, 05:56 AM
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Join Date: Aug 2006
Location: Jacksonville,
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Cobra Make, Engine: Just a collection of parts right now...
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Quote:
Originally Posted by bobcowan
Compression doesn't really matter.
Any IR system does better with a wide LSA, at least 112*. Less than that, and you tend to get a lot of reversion. That's what caused the "Weber Cloud".
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So a K code cam with an LSA of 114 degrees is good to go then. |
04-23-2026, 09:29 PM
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Join Date: Jul 2003
Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
Posts: 1,150
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Well,...
Quote:
Originally Posted by spl310
So a K code cam with an LSA of 114 degrees is good to go then.
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what are you trying to accomplish with the setup? Do you want something mild and tame or are you recreating the real deal?
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Paul
Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
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04-30-2026, 05:11 AM
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Join Date: Aug 2006
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Cobra Make, Engine: Just a collection of parts right now...
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Quote:
Originally Posted by PDUB
what are you trying to accomplish with the setup? Do you want something mild and tame or are you recreating the real deal?
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I am not planning to race. I would like a streetable driver that wows people when I pop the hood. |
04-30-2026, 11:00 PM
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Join Date: Jul 2003
Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
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Ok,...
...but you don't have to race it to build the real deal! Those high LSA's are for EFI cars that have knock sensors that will have a fit with a lower LSA and a bit of rumble. You will give up some low-end with those numbers and no overlap. I'm thinking more like a 108 LSA for mine. 
__________________
Paul
Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
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04-21-2026, 09:40 PM
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CC Member
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Join Date: Jul 2003
Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
Posts: 1,150
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Hell yah,
Quote:
Originally Posted by bobcowan
Compression doesn't really matter.
Any IR system does better with a wide LSA, at least 112*. Less than that, and you tend to get a lot of reversion. That's what caused the "Weber Cloud".
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I'm a member of the "Weber Crowd!"
__________________
Paul
Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
Last edited by PDUB; 04-21-2026 at 09:44 PM..
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04-21-2026, 09:42 PM
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CC Member
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Join Date: Jul 2003
Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
Posts: 1,150
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Frickin' website!
Duplicolor...
__________________
Paul
Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
Last edited by PDUB; 04-21-2026 at 09:47 PM..
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04-21-2026, 12:20 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,459
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Yes. 114* is optimum for an IR system.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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04-22-2026, 08:15 AM
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CC Member
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Join Date: Apr 2021
Cobra Make, Engine:
Posts: 587
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Love my Webber 44IDFs....I think
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