home porting heads questions
home porting heads questions I am porting my first set of ls1 heads and want to know what other porters are getting as far as volume on the intake ports when they are all done porting.I would like to keep mine below 225cc.This is for a set of 853's too.And any flow numbers they were able to achieve would be great.I am going to do 1 intake runner and 1 exhaust runner and then have it flowed on a superflow 1020 against a stock port,so i can see the difference the porting made.I will post pics of the ports when i am done with them,just waiting on some burs.any help would be appreciated.And any tips on the short side radius would be great if you got em.
best way I think to hand port. is do one improment on each port. And get them all done at that same time. if not it might be weeks later you go to start on another port thats as cast still.
Unless your have open access to the bench, and are going to put the head on it 50 times. And try diffrent things. Finishing one port and a head you want to end up useing. And seeing what it dose. Then going to work the rest in going to nothing for you, your not gona to gain anything from getting data like that.
Get a junk head or somthing too. I take so much time to do a good job, and our 1st time you don't know what your getting yourself into. Ask chuck about tring this, last winter he bought a set of used heads form the shop with the same ideas as you. And after like 2 days of work intro them, I saw him and he was like. F that I'm just gona buy somthing, and enjoy 60hours of free time this winter. haha
I'm doing a set of 243 right now. But had good resulted from some 241s I did last year.
http://www.hardcorels1.com/vbulletin...ead.php?t=1161
Unless your have open access to the bench, and are going to put the head on it 50 times. And try diffrent things. Finishing one port and a head you want to end up useing. And seeing what it dose. Then going to work the rest in going to nothing for you, your not gona to gain anything from getting data like that.
Get a junk head or somthing too. I take so much time to do a good job, and our 1st time you don't know what your getting yourself into. Ask chuck about tring this, last winter he bought a set of used heads form the shop with the same ideas as you. And after like 2 days of work intro them, I saw him and he was like. F that I'm just gona buy somthing, and enjoy 60hours of free time this winter. haha
I'm doing a set of 243 right now. But had good resulted from some 241s I did last year.
http://www.hardcorels1.com/vbulletin...ead.php?t=1161
Last edited by studderin; Feb 14, 2009 at 07:50 PM.
thanks.i am def not a newbie when it comes to porting,and have had good results from other heads and fast 90 that i have done.But this is the first set of ls1 heads i am trying.I am going to do a single set to the best of my knowledge and test it,if it works great,then i will just repeat it,if not i will make changes and give it another shot.Your ports look nice on those 241's studderin,i am doing mine similar to those,but leaving more of the swirl ramp in.
yeah i know the 243's i have are very nice.i am doing the 853's just because its winter,i am a little bored,and i really like porting.I have a couple buddies around town that still have stock heads,so i may be able to negotiate selling them easily if they come out good.Anyway i will post a pic later of what i have done so far on it.
here are a couple before and after pics,almost done with this port just have to work the valve seat a little and then hit it all with the sanding rolls.This is just after the cutters.let me know what you think.
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make sure to knock the swirl ramp out and also the rocker boss. A hole will come through when you knock off the rocker boss but the bolt will fill it back up. just dont get too too wild
These arent MY heads, but this is how my port looked, except this is in the rough cutting, i sanded and smoothed the exhaust and sand blasted the intakes
These arent MY heads, but this is how my port looked, except this is in the rough cutting, i sanded and smoothed the exhaust and sand blasted the intakes
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Verdad Gallardo in my opinion the swirl ramp is important in promoting swirl,and think it is more important to keep it.It may not produce the best flow numbers,but should promote better power.All of the best performing heads i have seen leave the swirl ramp.I removed the rocker boss already as you can see in the pic.Any other opinions on the swirl ramp?
Well i can tell you this!! I went consistant 12.71 - 12.72 @ 103, and with the addition of the Fast 90 and my home ported 243's comming in at 11.15:1 CR i went 12.12 and 12.14 @ 109.91 - 110 consistantly.
here are a couple pics of the finished intake port.I have not had much time to work on this so progress is a little slow but i am going to try and get the exhaust port done this weekend and then get it on the flowbench to see how it does.I will post up the flow numbers probably next week sometime
looks good so far ive done 3 sets of ls heads in the last year......
i always do a good bowl blend seat transition,,trim rhe valve guide,,remove the swirl ramp and rocker boss....ive never had access to a bench,and my heads have always been an improvement over stock....good luck....
i always do a good bowl blend seat transition,,trim rhe valve guide,,remove the swirl ramp and rocker boss....ive never had access to a bench,and my heads have always been an improvement over stock....good luck....
in my opinion the swirl ramp is important in promoting swirl,and think it is more important to keep it.It may not produce the best flow numbers,but should promote better power.All of the best performing heads i have seen leave the swirl ramp.I removed the rocker boss already as you can see in the pic.Any other opinions on the swirl ramp?
BUT..........in high perfermance applications, situations where you need really fast straight flowing airflow, during high rpm's, it can actualy "get in the way" especialy when youve changed the camshaft and in doing so changing peak torque location in the power band to a higher rpm. thats why NO aftermarket race head incorporates this feature.
myspelling sucks
