Not Ranked
351w main brg tunnel bore is 3.193" so 1/2 is 1.596". Now if you recheck your deck to tunnel dimension you will find that is around 7 7/8" ( 7.875" ) and if you add 7.875" + 1.596" = 9.471" [ pretty close to the Windsor 9.480"]
Now you say your crank is 4.170" stroke;therefore 1/2 stroke is --2.085" + 6.125"rod + 1.280" pin height to give a total of 9.490" which if your block when measured accurately checks out will give you a 0.010" out the top of the block piston protrusion. If you find this is the case you should look for a later block whick has a deck height of around 9.510" or if possible [ might not be practical ] machine the piston crown to give the correct piston to head clearance- dont forget to recheck valve pocket depths/clearance.
Jac Mac
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