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The heads from the Boss 302 became the production heads on the 335-series 351 cu in (6 L) "Cleveland" engines, which used the same bore spacing and head bolt configuration as the small block engines. As the 1980s drew to a close, Ford began the design of a new OHC V8 to replace the venerable small block design.
The first Y-block on Ford automobiles and F100 trucks was the 239 cu in (3,910 cc) version as released in 1954 with EBU casting numbers. The Y-block was the same displacement as the old Ford Flathead V8 that it replaced but with a bigger bore and a shorter stroke (3.5 x 3.1 in).
The 289 "HiPo" K-code engine was also offered with a C4 transmission, but it had stronger internals and can be identified by the servo's outer casing, which is marked with a 'C'. The long-duration solid-lifter camshaft that allowed the high-revving 289's horsepower rating, was not a good match for a low stall speed automatic torque converter.
The Ford Boss 302 (formally the "302 H.O.") is a high-performance "small block" 302 cu in (4.9 L) V8 engine manufactured by Ford Motor Company.The original version of this engine was used in the 1969 and 1970 Boss 302 Mustangs and Cougar Eliminators and was constructed by attaching heads designed for the planned 351 Cleveland (which debuted the following year) to a Ford small block. [1]
This design also relocated the water outlet from the front of the heads to the top center of the heads. These, designated V8-78, were offered with standard 6.2:1 compression aluminum or 7.5:1 compression iron cylinder heads , rated at 85 hp (63 kW) and 144 lb⋅ft (195 N⋅m) (aluminum) or 94 hp (70 kW) (iron). [ 19 ]
There was a U.S. auto industry-wide shift to lower compression ratios in mid-1971, so AMC increased combustion chamber size to 58-59 cc. The first three digits of the casting number on the large chamber heads are 321, 322, or 323 depending on year. The only difference between small and large chamber Gen-3 heads is the combustion chamber size.
It also contains a lot of personal essay text (e.g., Something worth noting was the fact that the Ford Engineers designed the Cleveland heads with the same bore spacing and head bolt configuration making it possible (with some light machine work) to bolt Cleveland heads to the Windsor block and it was dropped after the 1982 model year, and is ...
The two engines are nearly identical; the differences are in the rotating assembly and combustion chamber sizes in the head (the heads are interchangeable). It produced 170 hp (127 kW) (gross). The 300 became the base F-Series engine in 1978 at 114 hp (85 kW) (horsepower number changes due to Ford switching to net power ratings in 1971).