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Old 04-28-2010, 04:42 PM
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greg schroeder greg schroeder is offline
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Join Date: Feb 2006
Location: Scottsdale, AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
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Quote:
Originally Posted by jhv48 View Post
Is the engine, in fact, a 427R? Or is it a 427SR?

They both say 427R on the valve covers but the SR has a dual plane intake with a Street Avenger vacuum secondary carb. The "R" has a higher rise single plane intake and DP carb. The "SR" is much more street friendly and has the same torque figure as the "R" version but the power comes on lower in the rpm range.

I chose the SR version for just that reason. You will not be disappointed.
I'd disagree with the idea that the 427R single plane intake is less than streetable. It's very streetable when the carb is set up correctly. My advice would be buy a Pro-Systems carb. I had the 1040 cfm which is said to not be usable on the street in many forum threads which is also not true.
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