![]() This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". ![]() These cookies ensure basic functionalities and security features of the website, anonymously. This worked so well for me I literally felt a difference in my butt dyno.Necessary cookies are absolutely essential for the website to function properly. You will get more benefits from glass bead blasting all the ported serfaces (except valve and its seat). I personally think that polishing is over rated. Keep lapping until the valve and the seat have a perfect match. Look for any of the compound that didn't make contract with the valve, or the valve seat. When your done, hand lap the valves with valve lapping compound. That surface rust can be cleaned up with some scotch brite. If you want to shape the valves smoother that's fine BUT DONT TOUCH THE SEAT AREA. (masking the valve seats is a good idea)Īs for your valves, they are fine. BUT you can shape close to them id you have a steady hand. Be EXTREMELY careful around the valve seats and do not, by any means, nick the seats. I used the kit from summit racing for port and polishing and it has a wife variety of grits and sizes. After you get the shape you want then use the barrel sanding cartridges. Be very careful though and take little off at a time and keep all transitions blended. What you want to start out with is dye grinder bits. The bits you have are actually for finishing. You will probably get the best results excactly how you're doing it. I can tell by the direction you're going with this you already know about flow vs velocity and what excessive porting can do. ![]() An ordinary workshop won't succeed with this work much better than me, cause they also will do it for the first time.įirst off I commend you for doing your homework. I have no racing proven engine builders nearby. Any help will be greatly appreciated, but please, don't advise me to find a reputable workshop with flowbench. And the last quick question: have I ruined the valves or a piece of fine grit emery paper could help: Can I smooth these edges or I'll just ruin valve seats in this case?ģ. Valve seats are not flush with surface and form sharp edges themselves. I'm going to smooth sharp transition edges What cutting bits should I buy? And what polishing bits for exhaust channels and combustion chamber?Ģ. I've tried them but they almost don't cut aluminum at all. I have a dremel, but it lacks of working bits, just drum sanders and couple of orange stones. Maybe any professional could give me some advice. I've never done porting work before, thus I have a couple of questions. Not just porting but rather smoothing, removing of imperfections and intake manifold port/gasket matching(leaving exhaust head-to-manifold steps along). I'm going to do a bit of porting work with my head and manifolds.
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