Roush 427R - Any regrets?

[Goopie 18]

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.

[SP01715]

Originally Posted by Goopie 18

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...

[LIONDOG]

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.

[greg schroeder]

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.

[Roush #1]

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.

Jody