On a 1972 Evinrude 25,<br /><br />What are the 20 or so small bolts that hold the exhaust cover to the crankcase bolts made of?<br /><br />The majority came out easily but the 4 inner most bolts lost their heads (literally!)<br /><br />I somehow managed to extract them (with some kind assistance from forum members) but need to replace them with something suitable.<br /><br />Are they stainless steel?
