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Car Forum / Ford / Ford Mustang / March 2008351C 4V engine markings
My 351C 4V has a "square" block and the head is stamped "4 dot". What is the difference between the "4" stamp and "4 dot"? Also the "D" block vs. "square" block. mike The 4 dots indicate the more robust 4 bolt main shaft in the Cleveland engine, I do believe...From a conversation I heard in a shop once, so I may be mistaken. Actually, I thought I was mistaken once, but I was in error...lol | My 351C 4V has a "square" block and the head is stamped "4 dot". | What is the difference between the "4" stamp and "4 dot"? | Also the "D" block vs. "square" block. | | mike All Clevelands were set up for four bolt mains although the majority were not drilled and tapped. Heard that somewhere. It really does not matter unless I do something crazy like put on a charger or blower :) Already talking about installing a ram air since the hood appears to be ready for it, just cut a hole. > The 4 dots indicate the more robust 4 bolt main shaft in the > Cleveland engine, I do believe...From a conversation I heard [quoted text clipped - 9 lines] > | > | mike The dot is meaningless. If the car is a 1970-71 and its an "M" or "R" code its got closed chambered heads. if its 1972+ and its a "Q" or "R"code its open chambered. Later (73-74) 4v's came with smaller valves instead of the earlier 2.19 (intake) they had the 2v size (1.90?). Thats assuming the heads are stock however Ford may have put closed chambers on a few Q's & R's later so really the only way to know for sure is to look at the chamber. All cleveland blocks have very few differences. Some of them had thinner walls but that is a luck of the draw thing. All are capable of being 4 bolt main all that is needed is the caps. > My 351C 4V has a "square" block and the head is stamped "4 dot". > What is the difference between the "4" stamp and "4 dot"? > Also the "D" block vs. "square" block. > > mike
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