Quote:
Originally Posted by 3r!c84
how much over bore makes it a 406? 30?
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a 400 bored over .030" with a standard crank makes a 406, either route you take it will be a 406, if you go with the aftermarket crank it is still a 3.75" crank the rods will be 5.7 or 6.0 instead of the 5.65 rods that came in the 400, but you would use a shorter compression heighted piston with the 5.7 rod and an even shorter compression heighted piston with the 6.0 rod. either way you still have a 406.
now for the pro's and cons of doing it both ways: stock crank and rods: (cons) not as capable of as much power, with 5.56 rods your piston selection will be very limited to almost just using rebuilder pistons which will have a shorter compression height on them and you will end up having to have the block decked to make up for the difference, and you will likely have to have the crank turned and use .010" bearings = about 250.00 in extra machine costs. (pros) it will still likely cost less than buying the rotating kit. aftermarket rotating assembly: (cons) it will likely cost more. (pros) it will be stronger, and you will have a much larger variety of pistons to choose from