Even though the Cleveland 351 came from the small block family, few parts will interchange.The heads on the 351 4 barrel engine were very similar to the Boss 302 heads.In 1971, Ford offered only a two barrel version of the 302 motor.
The 1971 Boss 351 could be called Fords greatest performance small block motor. New air quality standards put better smog controls on the motors, affecting the performance. The mid 71 Boss 351 (Cobra Jet) engine wasnt much of step up from the stock 4 barrel motor. The compression was 9.0:1 in both motors. The cam timing was retarded 4 degrees. All the heavy duty parts were kept but the compression went to 9.2:1. The heads were open chamber instead of the semi-hemispherical. The solid lifter cam had a little less duration (275 degrees) and more lift (0.491). For practically any application, the Ford 351 Cleveland is the performance choice with plenty of horse power and torque. Lower compression heads and hydraulic cam. The H.0. engine was a seperate engine with VIN engine code R. This engine is almost identical to a 71 R code Boss 351, and was even refered to as the Boss 351 in Ford literature. It actually had a larger lift cam the 71 version, although the duration was less. It had solid lifters, and most of the other associated parts. Compression was around 9.2 with open chamber heads and a Forged flat top piston with a single valve relief. It had all of the best Ford could offer: Heads just like the Boss 302 with canted-valves Canted-valves (2.19 intake and 1.71 exhaust) Compression chamber of 66-67 cc (compared to the Boss 302s of 57-60 cc) Four bolt mains - specially hardened Cast Crank shaft with 90 nodularity Forged steel rods - shot-peened magnafluxed with heavy duty 38 bolts and nuts Forged aluminum pistons with pop-ups 11.1:1 compression Mechanical camshaft of 290 degrees of duration 0.477 of life Hardened and ground pushrods and guide plates Aluminum dual plane intake manifold Autolite 4300-D carb.
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