Sleeves are sold by cylinder diameter and length; they're not engine-specific. If you've got minor cylinder wall scoring to deal with, use the thinwall type (3/32" wall thickness) or if there's a hole in the cylinder, use the 1/8" thick heavy-wall sleeve. Give me a top-to-bottom length measurement of the cylinder, and I can research the proper part number sleeve for you.
Jerry

Edit:
Here are the Melling part numbers for the sleeves that fit a 270:

3/32" wall: CSL 146- - - $38.92 at Summit Racing with free shipping
1/8" wall: CSL 246- - - $40.92 at Summit

Good luck!

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