drscooby 0 #1 Posted December 26, 2014 HOW HARD IS IT TO CONVERT FROM ORIGINAL MUFFLER TO A TAIL PIPE EXHAUST AND MUFFLER Share this post Link to post Share on other sites
Racinbob 10,859 #2 Posted December 26, 2014 I'm assuming that your exhaust port isn't threaded? It's not difficult to tap it 1/2"NPT but care must be taken to keep the shavings out of the engine. In the past I've made adapter plates that utilize the original studs and have the hole tapped in that. It was just easier to do that way. 1 Share this post Link to post Share on other sites
Jake Kuhn 1,554 #3 Posted December 26, 2014 Bob is right, just wanted to add in, if you purchase or borrow a tap make sure and get a straight one and not a tapered one. I bought a tapered one and ended up having to cut it because it would hit after only about 3 threads the correct size. 1 Share this post Link to post Share on other sites
Racinbob 10,859 #4 Posted December 26, 2014 Excellent point Jake. I forgot about that. Drscooby, that's critical if you decide to tap the block. The 1/2" NPT tap I have is tapered but by tapping the bolt on adapter off the motor it allows me to run it past the taper. Share this post Link to post Share on other sites
AMC RULES 37,102 #5 Posted December 26, 2014 Not hard...use one of these. https://www.google.com/search?q=1/2+pipe+tap&espv=2&biw=1366&bih=643&source=lnms&tbm=isch&sa=X&ei=om2dVN_DBYuegwT0loL4CA&ved=0CAcQ_AUoAg Share this post Link to post Share on other sites
Racinbob 10,859 #6 Posted December 26, 2014 A bit more info that may be helpful. The typical 1/2" pipe size tap will be 1/2-14 NPT. That is a tapered tap and the thread issue in a blind hole can be the result. A 1/2-14 NPS tap is a straight tap. I'm not a machinist by any stretch but I'm thinking the ideal thing to do if you want to tap the block is to first use a NPT tap and then follow up with a NPS tap. Share this post Link to post Share on other sites
VinsRJ 721 #7 Posted December 26, 2014 I typically find that a 1/2-14 NPT provides enough threads for a stock RJ/Suburban exhaust. Share this post Link to post Share on other sites