That's exactly why I asked. Never chattered a full chamber but I have fully polished just about every single chamber on my own personal stuff.. and several others who would actually pay for the extra time and consumables.. for about the last 20 years or more. But years ago when closely following Larry Meaux's texture work I did 2 sets, SBF and SBC, with burred finishes around the intake throats leading right up to the seat and also around the chamber walls and also inside the intake valve relief of the piston. My motor came apart 2 years later for more aggressive port work with manifold change and didn't see the chevy for 5 years for a refresh. Both had very slight buildup in some area's of the choke due to slight reversion and all chatter finish in the chamber/valve notch was nearly indistinguishible from the surrounding fully polished surfaces due to layer of carbon.statsystems wrote: ↑Wed Jun 06, 2018 8:25 pm
I've never left a burr finish in the chamber because I can't do it well enough, so I don't know about the burr finish.
But I can tell you I've seen chambers that were CNC finished and eventual they smooth up.
BTW, there isn't much difference between an as cast chamber and a burr finished chamber. If the OP has an as cast finish in the chamber he should run it. If he has a smooth finish he should run it.
The OP is making a continent out of a flea turd.
Can't say for certian if that finish helped power at all initially.. but the only thing that I can say for sure is that the fully polished area's certainly were much easier to clean.
I only spend the time to do it because I think there's slight merit to reducing surface area, poor mans TBC, and it has proven itself at reducing heavy accumulations and is easier to clean off later on. Some area's can be scratched off with a fingernail. Same reason I fully polish uncoated pistons and valves as well.