Port and Polishing heads.
have you hit the intakes yet? Heres mine, i got the first 4 done on the valve side, will go back and touch them up better once the new carbides i ordered come in. The only one i have now can't get at everything as well. This should increase flow quite a bit.
Here's a link that I've had bookmarked for a while: https://ls1tech.com/forums/generatio...ml#post4407860
Ok guys i have a basic idea of what to do with the valve guide, but i have a more theoretical question. I've seen a sharper ridge around the valve guide and others that have a nice smooth one.
Wouldn't the sharper ridge create more turbulence by splitting the airflow much greater, than letting it take its own smoother path around the guide and over the swirl ridge? I personally feel like the first picture will net more mid-range power due to the swirl ramp and the smoother guide, and second more higher rpm power, but like bracketracer said "Sometimes things that you think would work don't always work well."
Wouldn't the sharper ridge create more turbulence by splitting the airflow much greater, than letting it take its own smoother path around the guide and over the swirl ridge? I personally feel like the first picture will net more mid-range power due to the swirl ramp and the smoother guide, and second more higher rpm power, but like bracketracer said "Sometimes things that you think would work don't always work well."
my personal heads did close to picture two as this is what the cnc'd head had i was copying.
custm2500 you get to the intake ports yet? I switched over and finished the exhaust ports, then went back and im having a hell of a time getting all the way in to the rocker bolt hump. Got most of it but can't get a nice smooth transition. I just ordered some sanding rolls, i hope they can get the job done to smooth it out.
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yeah the swirl ramp is completely taken out thats why. i left mine in as i only have a 215 intake and .600 lift, i figured i wouldnt really benefit from taking it out, though i did shape the area in front of the valve guide like that. i think next time im going to leave a ramp square to the port to pitch the air down to the valve instead of around the stem. similar to what we do on old pontiac heads and see if i get same flow and itll keep less cc in the port.
Also ordered some long carbides, should be in in a couple of days. Meanwhile i will disassemble the second head and start on that.
Last edited by Marcello7x; Feb 11, 2011 at 07:22 AM.
the thing with VJs imo you can't cut corners or you may end up with something worse than oem. you gotta go with someone that knows LSX cars, so you cant skimp out unless you yourself have the experience
No experience here! This is the first i ever touch heads. I've always said you gain experience after you need it! I'll stick to just porting for now, so far they look 100x better than i expected. I'd like to have them flow-tested if its not too expensive.
This aluminum bit I got did what you see in the picture in like 1 minute...and suprisingly its a lot easier to control and make everything perfect.
Teching In
Joined: Jul 2010
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How does one port and polish a set of heads without a flow test bench. All intake ports and exhaust ports should flow within a very small percentage of each other. If they don't it's just wasted time. There's a lot more to it than a dremel and sand paper.
Besides im not running formula 1 or sending it to space so what little percentage its off I couldnt care less.... they work and so do the other sets ive done.