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  #1 (permalink)  
Old 04-28-2010, 12:12 PM
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Default Roush 427R - Any regrets?

I know this topic has been beat to death (I've searched through the forum)....but I am considering buying my first (used) SPF Cobra. SPF is the only choice for me, so no debate there. Not slamming other makes, just have made my decision.

Engine continues to be a hard decision. I admit to being a bit of a big block snob. But then there's the Roush 427R. I may have an opportunity to buy a lightly used SPF with a 427R.

Do any of you who own a 427R have any regrets about the decision?

What would you value a perfect 2006 with 2000 miles and a Roush 427R?

Thanks for your tolerance of a newbie rehashing old ground.
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  #2 (permalink)  
Old 04-28-2010, 12:48 PM
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I don't have opinion as to value and no experience with the "R" version, but I love the Roush 427 SR/TW that I have in my car.

Mike
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Old 04-28-2010, 12:59 PM
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Superformance is a wonderfull car. $53-55K depending on your location and resale value of color. If it is bright pink then resale is less than blue, silver, dark silver etc.
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  #4 (permalink)  
Old 04-28-2010, 01:06 PM
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I to have no information..

Will be purchasing a SPF with 427R looks like a good combination of car and power.

Also along for the ride...

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  #5 (permalink)  
Old 04-28-2010, 01:39 PM
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You can't go wrong with the SPF and the Roush 427R. Since you're buying a pre-owned car, the supply of the market and the cars that you whittle your list down to is going to drive your decision regarding the engine.

Asking prices are going to be all over the board. You're best bet is to compare prices for SPF cars that are listed here on CC, Cobra Country http://www.cobracountry.com/home2.html, and eBay to see if the seller has set a realistic asking price to use as starting point to negotiate.
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Last edited by Got the Bug; 04-28-2010 at 01:48 PM..
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  #6 (permalink)  
Old 04-28-2010, 01:54 PM
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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.
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  #7 (permalink)  
Old 04-28-2010, 02:20 PM
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I have a 2006 SPF with a Roush 427R. The power and torque is very impressive. I have 4500 miles on the engine with no problems. When shopping for my car I drove 3 SPF's with the Roush, Shelby aluminum 427, and 427 FE side oiler. The heat from the last two was unbearable.The Roush never overheats in hot Florida weather. Living in South Florida ,The engine heat would have been a problem. I do notice that the Roush does not like approaching a stop sign at low speeds. I put the car in neutral and coast to the stop sign as I brake.
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Old 04-28-2010, 03:16 PM
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Quote:
Originally Posted by Goopie 18 View Post
I have a 2006 SPF with a Roush 427R. The power and torque is very impressive. I have 4500 miles on the engine with no problems. When shopping for my car I drove 3 SPF's with the Roush, Shelby aluminum 427, and 427 FE side oiler. The heat from the last two was unbearable.The Roush never overheats in hot Florida weather. Living in South Florida ,The engine heat would have been a problem. I do notice that the Roush does not like approaching a stop sign at low speeds. I put the car in neutral and coast to the stop sign as I brake.
My car used to have the same problem. I replaced the carb with a 4150 hp with billet metering blocks, and had a guy that has worked on a lot of Roush motors dial it in, and the motor does not do that anymore.

Can't go wrong with a 427R / SR...
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Old 04-28-2010, 03:18 PM
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Default R vs SR

jhv48...The engine is described as a 427R rated at 550hp. It is also listed as having a dual plane. According to information posted on the Roush website, a dual plane is available on the R...

http://www.roushperformance.com/pdfs/427R.pdf

And, on the above link it says the carb is a 770 with vacuum secondaries, while on the following link says the carb is a 750 with mechanical secondaries...

http://www.roushperformance.com/engines/engines.shtml

The car description does not mention what carb it has. Other than looking through the paperwork that came with the car, are there any other easy ways to tell the difference? Something that a neophyte could actually see?

Thanks all for the posts - interesting.
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  #10 (permalink)  
Old 04-28-2010, 03:33 PM
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The only regret I had with the single plane intake 427R in a Superformance was how the dealer set up the original carb, fuel delivery, air cleaner, headers, clutch, tires and half shafts. After all those things were changed the car was incredible.
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Old 04-28-2010, 03:38 PM
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I am very pleased with my 32 month old 427SR.

It has a dual plane manifold and Holley 80770-1 vacuum secondary carburetor.

BTW....Goopie
Try opening up the 4 idle mixture screws about a half turn each. This may smooth out your engine a bit at slow speeds. If it doesn't help, you can change it back very easily if it doesn't help.

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  #12 (permalink)  
Old 04-28-2010, 03:42 PM
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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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Old 04-28-2010, 04:04 PM
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Jody,thanks for the advice. I'll give it a try.
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Old 04-28-2010, 04:31 PM
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Glad to hear all is well with you and your car, Goopie!
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Old 04-28-2010, 06:31 PM
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Quote:
Originally Posted by LIONDOG View Post
I admit to being a bit of a big block snob.
If that's true then you will not be happy with anything other than a big block (meaning, an FE).
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