351W-4Vs are VERY common in classic Mustangs, mainly '69s. The 351W was standard on the '69 Mach 1. But Windsor heads only have 2 valves per cylinder....the 351W-4V is just a 4-barrel carbureted 351 Windsor. The 4V stands for 4-Venturi. Meaning 4-barrel.
I didn't know Clevelands had 4 valves per cylinder...never heard of that....learn something new everyday...I just thought that 351C-4V meant a Cleveland with a 4-barrel...and that the 4Vs just had a little better heads than a 2V....new to me....
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