Edelbrock heads on a 340 with KB243 pistons
That 8553 head gasket crushed is actually .046 crushed.
519sd is actually thicker when crushed even though summit says its .043 ... that's bull.There is a serious problem with sites posting false specs.
One 340 I did used kb243 with ported iron closed chambered heads and those pistons were .024 out of the block on that motor after getting the decks true/square, I ended up taking a few thou off the quench side of the piston to make .029 quench W/ 519sd head gaskets, .051 ish thickness If my memory serves me right..
I remember ordering 3 diff sets of head gaskets, torquing them with clay on the pistons to see the real crush and quench distance and laughing seeing how diff they were not only from advertised..but from hear say on sites. Eddy head gaskets are said to be .050 on summit, they showed up and were nothing but 8553 pt which are .046 crushed...so now that's two diff stated thicknesses on the same site...who are you gonna believe?