American car tuner and specialty manufacturer Roush Performance, founded by Racing Team owner and engine builder extraordinaire Jack Roush, offer a series of aftermarket parts, components and specialty cars based on the Ford Mustang and F-150. They also offer a range of crate engine packages for your vintage car, hot rod, and weekend racer. Their Ford 511 series engines are based on the legendary FE Sideoiler motor used on high performance Fords, and Cobras and GT40s during the 60's. They offer three versions of the engine and they're available today. Let's take a look.

511SR

Roush 511 FE 3
via Roush

Starting with the 511SR, Roush takes a cross bolted FE-aluminum block, steel crank and H-beam rods, forged pistons, and beefy caps. The bore is 4.37" and the stroke is 4.25". The heads are also cast in aluminum and CNC ported to improve flow. She's fitted with a dual plane intake manifold, roller cam, and a Holley 4 barrel carb. She's dyno tested with a certified 525 hp and 550 lb.-ft. of torque. This engine is very tractable on the street and lightweight. It lists for $28,850.

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511R

Roush 511 FE 2
via Roush

Next up is the 511R. This engine is virtually identical to the SR but instead of a dual plane manifold a single plane unit is used with a sweetened up hydraulic roller with a more aggressive profile. A larger carburetor is also fitted. Power increases on this engine to 575 hp and 580 lb.-ft. of torque. Redline is also a little higher than the SR at 6,250 rpm. The price is the same.

511IR

Roush 511 FE 1
via Roush

And last up in the Roush 511 crate engine family is the 511IR. You can probably guess what the "I" stands for already - Injected! The specs of this motor are identical to the SR and R with the exception of the custom EFI stack injection system. This lifts horsepower up to an impressive 600 even. The price is also raised to $39,450. It certainly isn't cheap and there are many ways to get more power for less money but if you're a Ford head or restoring a Cobra, the lightweight of the aluminum FE combined with the pedigree of the engine is enough to make it a fait accompli. Buckle up.

Source: Roush

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