[496fe]

I now have about 1,600 miles on a 496 cid Genesis-based SO. The blocks have more material around the cylinder bores also. You can easily use 4.310" pistons with a 4.250 bore which yields 496 c.i. I ended up at 607 fwhp with 9.4:1 compression - 91 octane baby! It turned out to be the ultimate dual purpose car I was looking for. 590 lbs-ft torque starting at about 2,400 RPM - it goes fast without ripping the tires out from under it.

I'm a fan of cubic inches and the aftermarket blocks make it easy, albeit a little on the expensive side - about $22K.

Good luck,

Brian