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The disadvantages of a 351C or 400M are that it is a much heavier block, and bigger physically. If I go to a big block build, I'll run right around the midblock class and go straight after a 460 let out as far as it can go.I had a 351M at one point courtesy of a '73 Grand Torino. Factory four barrel, four bolt main, the whole nine. The S.O.B. nearly bent a cherry picker...
If I ever go there again, I want it ALL!
In the meantime, I have the engine on the deck, and the heads are coming off tomorrow. THEN we'll know what kind of shape it's really in...
"Any man who tells you that an engine he is getting rid of has low miles on it and runs perfectly is full of crap!"
You need to give the 335 series engine forum, there is a guy who built a 400, and has injected it, NO they aren't a big block and don't weigh near as much either, far better to build because of it. The modifieds have a taller deck, but other than that, they are still the size of a Cleveland, so will drop in where a Windsor came out withaout heavy loss of room like a 460. I beat a friends built 302 with a stock 400 in a T-bird, supprised me greatly, ugly tank would go.
You can use the 90's 460 heads and FI system to make the older block fuel injected, you definately want the newer heads, the 71 will likely have sodium filled exhaust valves, designed for regular leaded gas.
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