And Penny just keeps on changing...

[Vegas69]

I was considering doing an undersquare engine as well. I have a bore size of 4.280. My block will take a 4.375 stroke. Ultimately my engine builder didn't feel it was a good trade off in power vs. cost and longevity. I had to ask myself, why don't you see them in any high performance application from the factory? The only conclusion I had was longevity and warranty. I ended up with a 4.25 stroke with a 6.385 rod. Another thing is big block stuff is heavy and they are harder to turn rpm with. Adding more low end torque and less high end hp didn't make sense for me where it may very well for you. I love this stuff.