does anyone know what parts any or not can be interchanged from a 351M to a 351C?My main concern is will motor mount locations be the same on both motors?
Thanks any help on this appreciated!
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very little interchanges.the motor mounts and the bellhousing match up to the 429-460.you could get the adapter stuff from the byar bros.or from anybody else who does the big block conversions.some engine parts that do interchange are timing cover,timing chain,dist.,heads,valvecovers,cam,lifters,oil pan,balancer,headers.
I wouldn't recomment using a 351-M under any circumstances. If anything, the identical 400-M would at least give some extra power & torque over a 351. Be aware these blocks are an inch taller & wider than the 351-C, so your exhaust headers won't fit around the rear suspension & gas tank without cutting & welding, the motormounts are the wrong pattern as is the ZF's bell housing. Finally, the M-series engines are low-powered truck engines only distantly related to the Cleveland, so to get back to a power level you had with a 351-C, new pistons, a specific 4bble intake and a good cam & lifters are the basics needed after you totally overhaul the M and manage to get it in your car. IMHO, a 460 is very little more trouble and tons of speed stuff is available. The Byers at PreProformance have all parts necessary, as was mentioned. 550+ streetable horses are certainly possible with this conversion, but 1st gear is utterly useless unless you regear the ZF & mount very wide rear tires & wheels for the monstrous torque available.