Inliners International Forums General Discussion Engines New to inlines, critic my build plan!

Hank,
Yup now I remember. The drill bit for a 350 Chev is about 1/8", so a perfect 350 block with no core shift would have a cylinder wall thickess of
(4.400-4.000-.125)/2 = .137" - .020" roughness = .117"
So at 30-over your 350 walls would be .102" thick, maybe even .082" if you had some core shift.

The 230 six I measured had a 13/64 drill slip in between cylinders thru the freeze plugs. So at 4" bore, the wall thickness would be
(4.400-4.000-13/64)/2 = .100" - .020" roughness = .080"
So a Six bored to 4.000" would have walls of .080" in a PERFECT block with no core shift, and as thin as .060" in a more typical core shifted block. That's too thin.

So the 230 cylinders ARE cast thinner than 350v8 cylinders.
Not sure on the 292, I will see if I measured any.

Not that any of this affects Mitch, he just needs a 250 crank!