I've got the Sonic Test results from my machine shop this weekend and I'm wondering what you Y Blockers think. It's a 272 standard bore. The measurements came out about like this:



avg wall thickness: .226"

min wall thickness: .217"

max wall thickness: .241"



The thickest walls are the 1-4 cylinders, and the thinnest walls are the non-thrust side of the 5-8 cylinders. If we bore that from a 3.625 to 3.750 that's going to take the wall thicknesses to about these measurement:



avg wall thickness: .1630"

min wall thickness: .1475"

max wall thickness: .1785"



I've heard it's good practice to try and maintain about .180" as a minimum wall thickness. +or- .015" with the average at .1630, my machinist is absolutely fine with boring it up to a standard 292. What has you're experience proven with these Y's? If you guys needed I could post a more elaborate description so you had a better picture of the cylinder wall thicknesses. Thanks for you're help.

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie