[hardline_42]

Originally Posted by johnjzjz

(you can modify a 0.015 shim gasket for a 350 to fit a 400).
tin gasket wont work with steam holes
the 350 steel ring is aprox 4.090 in diam and sits on the block away from the bore .010 to .035 and the 400 motor is 4.125 the 350 metal ring is sitting inside the combustion chamber ??? almost its entire area it covers over the paper part -- that dident work for long if you did that - jz

Should've elaborated I guess. You scribe the gasket from the inside of the bore to get the bore diameter and you cut it to fit or use a gasket with the appropriate size as a template. Do the same for the steam holes. That's what I meant by "modify." I used the rubber coated kind and I had no problems with my previous engine. But again, my point was that it's a short cut used primarily to get you the optimum quench height with a stock deck height block but it will also get you the tiniest bit of compression increase.