On 7/29/05, stanley clinton <threecarb65@xxxxxxxxx> wrote: > Apparently the sleeves sort of free stand in the > block,if that makes any sense.They are not enclosed by > the block at the top,I'm sure someone on this fine > list will know for sure? Here's some good pictures of an Al block: http://www.slantsix.org/articles/dutra-blocks/alm-block-sl6.htm You can see that the cylinder liners aren't supported at the top. Besides the possible bore shifting, the gaskets have a hard time sealing the iron head to the aluminum block., so you can't go overboard with the compression. -- Tony brummett@xxxxxxxxx '64 Dodge 440 '65 Dart GT