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  #11  
Old 17th August 2019
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seajay seajay is offline
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It's all part of their BFH head service.
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  #12  
Old 17th August 2019
NGOT8R NGOT8R is offline
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My brother just had Branch O’keefe port the heads for his 2017 CVO SG and both intake/exhaust ports, as well as the combustion chamber are polished to a mirror finish. I always thought the intake port should have a rougher finish, but Branch swears by the mirror polishing to all areas on their heads as a performance enhancement.
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  #13  
Old 17th August 2019
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Ready to drop a valve into this cylinder too!
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  #14  
Old 18th August 2019
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Maxeffort Maxeffort is offline
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Quote:
Originally Posted by NGOT8R View Post
My brother just had Branch O’keefe port the heads for his 2017 CVO SG and both intake/exhaust ports, as well as the combustion chamber are polished to a mirror finish. I always thought the intake port should have a rougher finish, but Branch swears by the mirror polishing to all areas on their heads as a performance enhancement.
I finish ports with a 60 grit cartridge roll. Chamber with a cross buff.

Some of the cylinder head guys I know have gone to a carbide burr finish, even to the point of smoothing and shaping, then knock the whole port with a burr to put texture back into it.

The Branch Head has a beautiful polish to it. I guess it works for them. It also makes the customer feel good about the work.

One thing for sure, this highly polished head was loaded with carbon. It sticks to the polished surface very well!
I knew the head was ported, but not to what extent. I didn’t even realize the chamber was not “as cast” because the carbon was so thick. I had in the jet washer most of the day while cleaning other parts and I still had to do some hand cleaning.
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  #15  
Old 27th August 2019
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Where the valve stem enters the head ... they seemed to have removed a lot of metal that acts as a support for the guide. I have a set of Evo heads at home where the entire valve guide let loose due to not enough metal to hold it in place.
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  #16  
Old 27th August 2019
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Well Jerry Branch is no longer with us
Before I had my first heads done I called Branch-OKeefe and was not impressed.
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  #17  
Old 27th August 2019
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Quote:
Originally Posted by tussuck View Post
Where the valve stem enters the head ... they seemed to have removed a lot of metal that acts as a support for the guide. I have a set of Evo heads at home where the entire valve guide let loose due to not enough metal to hold it in place.
That seems to be a product of CNC porting. It's actually my pet peeve. I prefer to do hand porting so I can retain the boats around the valve guides. Once those are machined out, there is turbulence created where the flow goes around that round guide. Kind of like a stream as it flows around a round boulder. Great for fishing, not so great for porting. Maybe the plan is to feed fuel to the gremlins that hide behind the guides?
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  #18  
Old 27th August 2019
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By the way, the theory behind a rough intake port surface is that a layer of air is trapped in the rough surface, and that layer of a/f mixture becomes the smooth surface that the rest of the flow travels over. So there is basically no difference between rough and smooth as far as the flow is concerned, so people don't waste the time to polish intakes. That is my understanding that dates back to studying Smokey Unic's early discoveries.
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  #19  
Old 27th August 2019
Tomcatt Tomcatt is offline
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Pops Yoshimuras' theory. "If the ports are too large, make them rough. If the ports are too small, polish them."
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  #20  
Old 27th August 2019
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Branch has made a "fin"(or wing) before and after the guide to split the flow around the guide. There is also a bias to the fin, to direct the air more to one side.
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