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Old 06-13-2007, 11:47 AM
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Location: Palm Coast, FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
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Originally Posted by Excaliber
So why did the Competition Cobras run a single four (dual fours DID make more horse power)?

I would speculate it was because the single four had a 'center pivot' float that kept fuel from sloshing into the mouth of the carb under high cornering or braking g forces. The center pivot fuel bowls are too long to mount two carbs back to back on a 2X4 intake.

All though Shelby did put two fours on a GT40 scheduled for Le Mans in an effort to find more horse power. Not sure if it stayed that way for the race?

Medium Riser heads on the SC? High Riser heads were discontinued in 1964, but would have been available if an an owner wanted them.
S/Cs had MR heads, unless changed out by the owner, or some special build was requested. The 2x4 setup promotes more low end and mid range power, perfect for the "street" version on the comp car. The 1x4 makes more top end power, so it's a natural choice for a comp car. Since comp cars were built before S/Cs, my guess would be that they felt the S/C would have better street/strip power (i.e. stoplight/dragstrip) with the 2x4s.
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold

See my car at here >> CSX 4241
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