Comp XE270S experiences?

The Comp “270S”(part number 20-246-4) is not part of the XE, or in the case of solid cams, “XS” family.
It uses the older Magnum solid lobes.

It would be fine in your application, but you’d probably be leaving a little power on the table compared to the XS equivalent.

A [email protected] cam using lobes from the XS family would have to be a custom.
The smallest XS shelf cam they offer for a SBM is 230/[email protected].