The stiff head bridges across between bolts much better and applies better loading out in the unbolted areas.
Separate exhaust ports are a huge help to even out the temperature related distortions.
We had Darton custom-make replaceable sleeves for us so that we could fix cylinders at the track. Reverse Murphy's law....were prepared for that so we've never needed that. Sleeve OD is 4.5 so we only have .12 wall between cylinders but with the solid block, that's ok. The sleeve upper rim has a flat on both sides so they lock into their neighbor. O-ring grooves are in the upper rim of the sleeve. The counterbore depth in the block for the sleeve upper rim is a little short so that the sleeve stands proud of the deck by a couple thousandths assuring that we fully clamp around the cylinder.
Eric
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