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RJ Sledge · 06-09-2012, 02:12 PM

New Ford BOSS blocks are great except in Ford's infinite wisdom, they cut the bottom off the cylinders for stroker combo's(rod clearence), when you do this the wrist pin hole gets very low and sometimes (3.400 stroke combos) you can have the wrist pin (exposed) and that makes for a highly unstable situation as far as piston and ring positioning. To me the most important position is when the piston starts its upward movement in the cylinder. A wobbling/unstable piston at the bottom of the cylinder is not good for ring seal.

Eary model "R" blocks (SVO) are the way to go for 3.400 stroke combos IMO.

RJ

06-09-2012, 02:12 PM	#5
RJ Sledge Senior Member Join Date: Jun 2007 Posts: 790 Likes: 505 Liked 292 Times in 92 Posts	Re: 289 better than 302 block for 331 build? New Ford BOSS blocks are great except in Ford's infinite wisdom, they cut the bottom off the cylinders for stroker combo's(rod clearence), when you do this the wrist pin hole gets very low and sometimes (3.400 stroke combos) you can have the wrist pin (exposed) and that makes for a highly unstable situation as far as piston and ring positioning. To me the most important position is when the piston starts its upward movement in the cylinder. A wobbling/unstable piston at the bottom of the cylinder is not good for ring seal. Eary model "R" blocks (SVO) are the way to go for 3.400 stroke combos IMO. RJ