The 351W is based on the 302 design. It has the same size pistons 4". It has a longer stroke and a much larger crankshaft. I owned one. I had a 70 Mustang that came with a 302 (220hp), C4 auto, and 8" rear. I bought a 69 Cougar that had the 351W 4 barrel engine (290hp), FMX auto, and 9" rear. I put the entire Cougar drive train in the Mustang along with the power disc brakes. It was the equivalent of a 69 Mach 1 Mustang as far as drive train. This engine was preemission controls with a high compression and it would haul butt. It also got decent mileage on the highway.
Later I bought a 73 Cougar with the 351C engine. This was after the compression was dropped and the power was down. The 351C engine is physically a much larger engine. It has HUGE valves and intake/exhaust ports. It also got terrible gas mileage, about 10mpg running around Raleigh. It was low on power in the low rpm ranges due to the huge intake ports/etc. It ran fairly well after the rpms built up, but was nothing compared to the 70 Mustang with the 351W. Just to give you an idea of how it ran, I got into several drag races going to work with the same 82 Z28 Camaro. I could beat him, but not by much! The Cougar was a slug coming off the line. The 82z28 had either 145hp or 160hp depending if it had a carb or "Crossfire" fuel injection.
The Nascar Ford guys loved this engine. This is what Bill Elliot was running back in 85 and 86 when he had about 50 hp more than anybody else. Remember qualifying at 212 mph at Talledaga. Nascar wouldn't let him use the Cleveland engine after 86. Bill's car was so much faster than anybody else that he got behind two laps at Daytona due to a bad tire and he made up the two laps under the green flag!!!!
Last edited by Roadie; 03-24-2005 at 10:08 PM.