LS6 head porting questions...with pics
Originally Posted by CBX
I am not sure how to proceed with the combustion area. If I just leave this part alone how much flow am I giving up? I don't want to make any mistakes.
I did read somewhere that it's better to have the combustion chamber as smooth as possible so things are less likely to attach to it after combustion occurs.
A cutaway of the before and after of the valve bowls would be freaking awesome too btw! Anyone have a cutaway pic of a specific amount of how far to go down?
Just polish the chambers out and deshroud the valves to the gasket line, thats all I do. More flow can be had to do more work but a flow bench is needed to guide you on this.
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Originally Posted by Bo White
Just polish the chambers out and deshroud the valves to the gasket line, thats all I do. More flow can be had to do more work but a flow bench is needed to guide you on this.
How does it look so far? Thanks
I have a practice head where the guy before me ported into the water jacket under the swirl ramp. Looks like as viewed from above the bowl its right about even with the back edge of the guide but about 3/8 under the flat ledge behind the guide. I would think you could probably take it down another 1/8 safely from the looks of your pics, but id wait for someone else to chime in
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Originally Posted by Bo White
I chimed in on the other thread, leave everything shape and size wise alone and just blend and smooth(and take the rocker bolt boss out).
Correct, cut it all the way out so that it looks like it was never there, except the threaded hole being there. Blend it into the existing surrounding wall so its a smooth transition.
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Originally Posted by Bo White
Correct, cut it all the way out so that it looks like it was never there, except the threaded hole being there. Blend it into the existing surrounding wall so its a smooth transition.
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Verdad Gallardo Let me know what you guys think. This is what I have so far:
I basically just smoothed everything out. I took a tiny bit of material off of the area around the spark plug opening too.
I basically just smoothed everything out. I took a tiny bit of material off of the area around the spark plug opening too.
Last edited by Xtnct00WS6; Dec 12, 2005 at 10:00 PM.
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Originally Posted by Xtnct00WS6
Let me know what you guys think. This is what I have so far:
I basically just smoothed everything out. I took a bit of material off of the area around the spark plug opening.
I basically just smoothed everything out. I took a bit of material off of the area around the spark plug opening.
Looks blingy, get a good finish on the exhaust port too(anything finer than 80 grit doest increase flow, just keeps carbon deposits down to a minimum). Intake ports leave as 80/120 grit.
Originally Posted by CBX
That looks great. What did you use?
Last edited by Xtnct00WS6; Dec 13, 2005 at 11:36 AM.
Originally Posted by Bo White
Looks blingy, get a good finish on the exhaust port too(anything finer than 80 grit doest increase flow, just keeps carbon deposits down to a minimum). Intake ports leave as 80/120 grit.
Do you think I lost any compression when I reworked the spark plug opening section? Does polishing the combustion chamber (as apposed to leaving it stock) increase flow at all? I'm thinking not, but I'm curious.
Does anyone have a clear answer on what you are gaining by removing the rocker boss? i was thinking about leaving it on a set of 243 heads i'm doing for my ls1 truck, is it worth it to go ahead and knock it out? i was under the impression that the intakes were pretty good and the exhaust was what needed more attention.
Does anyone have a clear answer on what you are gaining by removing the rocker boss? i was thinking about leaving it on a set of 243 heads i'm doing for my ls1 truck, is it worth it to go ahead and knock it out? i was under the impression that the intakes were pretty good and the exhaust was what needed more attention.
