Krice58 165 #1 Posted 1 hour ago Not my picture but my 312-8 had the same muffler setup, most diagrams show an elbow threaded into the side of the block and then attached to muffler with a clamp where as on this one it’s mounted flat with two Allen bolts and an exhaust gasket. My question is even though it doesn’t have the threaded insert, will the block still be threaded to receive a pipe? Using this engine on another horse and I need to extend the pipe out to clear the hood so I wanted to just stick a 1 inch or 1 1/4 pipe out about 6 inches and put a shower head style muffler on the end of it. I think the head would be threaded for 1 1/4 (if there is threads)? Gonna take it apart regardless and see just curious to know if someone knew offhand. Share this post Link to post Share on other sites
kpinnc 18,370 #2 Posted 57 minutes ago Most blocks have threads but after all these years they may not be usable without chasing them. In addition, those Allen bolts will not be nice to you if you try to remove them. I would saw off the pipe a couple inches from the block and use a split adapter with a clamp. Might be the easy way but you're not dealing with a new block, and heat and carbon will make changing now not alot of fun. Later 300 series machines used an adapter that threaded in with a 45 degree nipple for using a clamp on muffler. If you manage to get the existing adapter off and threads cleaned up, these can be found used online or by checking with the vendor section here on the forum. Good luck whichever way you decide to go. Share this post Link to post Share on other sites
