caen fred Posted March 7, 2009 Share Posted March 7, 2009 I started the work on my MN47 (thanks to the provider ) by the exhaust port There is a ridge almost 0.7 mm deep under the valve seat? I told it to my Dremel and the thought of carving that rich aluminium turned it on what about the recess for the spark plug, it's very angular, should I smooth-it a bit? I have compression to spare with my Flat top L28, so a bit more CC wouldn't be a problem I guess. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted March 11, 2009 Share Posted March 11, 2009 Cleaning off that ridge is a good thing. Also look at smoothing the radius on the bottom of the port behind the valve seat. I'm no authority here but many suggest working on the intake manifold to gain breathing capability especially with a N/A engine. Porting the head will not be terribly effective without the intake being able to feed it properly. There are many great posts in here describing what some have done to improve airflow. Quote Link to comment Share on other sites More sharing options...
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