Quote Originally Posted by miked View Post
i'm still debating myself on this. i was actually fiddling with the idea. the story is a 4d56 turbodiesel with a 136.5 mm long valves (early models). if ever, want to try out the shorter valve (along with the camshaft of course). a friend is offering a surplus CH at a very friendly price. i'm not interested with the head casting(some cracks maybe) but actually with the valve train assembly (130 mm valves) i.e. longer valves to be replaced with short ones.

as per Uls' thicker head gasket, can't find a "thicker" gastket. the brands available around my place seem to be of the same thickness.
Changing the valves wont affect your compression, it will only affect the amount of A/F mixture that goes in to the cylinder.

To lower your compression, you can use two gaskets in between the CH and the Block.