Quote:
Originally Posted by danv
Just to the right of the distributor will be a rib in the block casting if it's a 400, nothing if it's a 351.
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Again...this assumes the engine is original or has been replaced with the same engine it was built with - thats not guaranted, remember, the car is 30+ years old. A lot of changes may have happened over the life of the vehicle.
The 351C is pretty easy to distiguish from the 351m/400. The intake is different as is the (front) timing cover area and as you mentioned the thermostat.
Similar to the FE family, mix-matching parts on 351m/400 is nothing more than swapping in the correct rotating assembly...the basic blocks are essentially the same and will take either, same with heads, intakes, cranks, rods and pistons. You can go up or down using either block. The only way to tell, for sure, is to check the stroke. There a few shade tree ways to do that, the post above gave a pretty good method.
