The 351 Windsor, built from 1969 to 1996, adds 0.5" to the stroke of the
302. It is of considerably stouter construction. Engine weight is 510 lbs. The
351W was designed as a long-stroke replacement for the 302 in passenger car
use. It later served as a truck and marine engine through 1996.
To avoid very short connecting rods and excessive piston side loads, the
351W uses a taller block than the 289/302, 9.480" (1969/70) and 9.503"
(1971/96). The crankshaft uses very large 3.00" main journals, shared with the
400M. 2.311" rod journals are shared with the 351C. The same 28 oz.-in.
external balance is used as found on the 289/302 and 351C.
Before 1976, the heads feature larger valves than the 289/302 and
provide a simple bolt-on horsepower upgrade. 351W exhaust manifolds, similar
in design to those used on the 289 Hi Perf, also flow more freely than
standard 289/302 manifolds.
Another way to tell the 351W apart from the 289/302 in most cases is the
number of intake manifold to cylinder head bolts. The 289/302 has 12, the
early 351W (pre 1976) has 16.
Some aftermarket manifolds do not have provisions for the 4 extra bolt
holes.
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