07-10-2007, 07:48 AM
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CC Member
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Join Date: Aug 2002
Location: Richmond,
VA
Cobra Make, Engine: Superformance Mk III / Windsor platform
Posts: 450
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Not Ranked
CobaK
Switching from the 392 to the 427sb will put a big grin on your face. It is night and day difference. I put 34000 miles on a 392 FMS stroker before I blew it road racing and replaced it with a a Roush 427R with a dual plane intake (not SR). I have since put about 10000 mile on the Roush. I do not think you need to move to the SR from the R in order to get good street manners, just get a dual plane intake. I love the 427R. I will say that I hate the vacuum secondary Holleys that Roush uses. I had a mechanical double pumper custom built for my motor by AED and spent about 2 hours on the dyno fine tuning it at their shop. Spent $900 on the carb and tuning process and worth every penny. That is the only change I have made to the 427R. One half tap on the gas pedal, turn the key and it fires right off every time. It has an aggressive nasty sounding idle at 1200 rpm, yet will still accelerate smoothly off idle with no dead spots. It makes gobs of power down low, and screams right up to 6200 rpm where I have the rev limiter set. I am currently running 11:50s @ 125 at the strip in full street dress.
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