how much can i milled ls1 heads ???
10-21-2009, 02:22 PM
#1
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how much can i milled ls1 heads ??? Hi i´m wondering
i´ve got this cam 232/234 .595/.598 112 LS whith springs
and i´m wondering on stock ls1 block 346how much can i milled the stock 2002 ls1 heads down ,
would like to have as much compression as i can whith pump gas....
I´m using gm gaskets..
????
i´ve got this cam 232/234 .595/.598 112 LS whith springs
and i´m wondering on stock ls1 block 346how much can i milled the stock 2002 ls1 heads down ,
would like to have as much compression as i can whith pump gas....
I´m using gm gaskets..
????
10-23-2009, 01:03 PM
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In addition to his question, my heads were milled .006 by the previous owner. Would that up the compression very much at all because I think I heard detonation before I took the engine out. But then again I might just be hearing piston slap.
10-23-2009, 01:18 PM
#5
You typically see 1cc per .006-.007" taken off the heads. Being you are only one cc down from factory, I can't see it being a detonation issue due to compression if that's what it is. It would more than likely be caused by bad gas or a tuning issue.
Jon
Jon
10-23-2009, 01:23 PM
#6
Adding to what I said previously when I had my LS1 heads done they where milled .030 had 59CC chamber running 11.5:1 compression. After everything I had done to the car I was just barely hitting 400 rwhp I went with a different cam and 243 heads and when all it was said and done I gained 53 rwhp and 22 tq. If I would have gone with just heads I would have picked up a minimum of 20 rwhp easily.
Last edited by 02*C5; 10-23-2009 at 01:28 PM.
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10-23-2009, 02:06 PM
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Don't waste your time with milling 241s castings they flow like **** and no matter what you do to them you will waste your money. I learned my lesson the hard way. Save your money and when you can get a set of 243s have a reputable shop mill and CNC them and it will be a different car altogether.
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i agree.. 100% i´m self running Trick flow´s
i´m building a motor here in Iceland from stuff i got from my old setup...
here in Iceland you don´t sell LSX stuff easaly, and expensive to buy from usa. specially now days...
so can i milled 241 heads down to -60cc or -59cc
And still use this big cam on my 346 LS6 block
cam´s specs: 232/234 .595/.598 112 LS
?
10-23-2009, 02:38 PM
#9
i agree.. 100% i´m self running Trick flow´s
i´m building a motor here in Iceland from stuff i got from my old setup...
here in Iceland you don´t sell LSX stuff easaly, and expensive to buy from usa. specially now days...
so can i milled 241 heads down to -60cc or -59cc
And still use this big cam on my 346 LS6 block
cam´s specs: 232/234 .595/.598 112 LS
?
i´m building a motor here in Iceland from stuff i got from my old setup...
here in Iceland you don´t sell LSX stuff easaly, and expensive to buy from usa. specially now days...
so can i milled 241 heads down to -60cc or -59cc
And still use this big cam on my 346 LS6 block
cam´s specs: 232/234 .595/.598 112 LS
?
The cam I used with my 241's 59CC chambers was a 232/238 600/600 so you should be fine always making sure you have .080 VTP clearance.
You will need smaller push rods make sure to get the correct length specially if your using LS7 replacement lifters. If you have any more questions let me know I think that the set up I had before was exactly what you are about to run. Where you will find the biggest issue is in the runners which is what makes velocity in the head. The 241 if I am correct have 260CC runners which are way big and good if your using forced induction and for high end HP but not so good in low to mid hp range and throttle response.
Good luck
Last edited by 02*C5; 10-23-2009 at 02:47 PM.
10-24-2009, 02:16 AM
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11-01-2009, 04:17 AM
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The cam I used with my 241's 59CC chambers was a 232/238 600/600 so you should be fine always making sure you have .080 VTP clearance.
You will need smaller push rods make sure to get the correct length specially if your using LS7 replacement lifters. If you have any more questions let me know I think that the set up I had before was exactly what you are about to run. Where you will find the biggest issue is in the runners which is what makes velocity in the head. The 241 if I am correct have 260CC runners which are way big and good if your using forced induction and for high end HP but not so good in low to mid hp range and throttle response.
Good luck
You will need smaller push rods make sure to get the correct length specially if your using LS7 replacement lifters. If you have any more questions let me know I think that the set up I had before was exactly what you are about to run. Where you will find the biggest issue is in the runners which is what makes velocity in the head. The 241 if I am correct have 260CC runners which are way big and good if your using forced induction and for high end HP but not so good in low to mid hp range and throttle response.
Good luck
because on my old setup whith the TFS 215cc and the same cam, i had a piston slappe....
What does that allow my much miled... you guys think?
Baezi
11-01-2009, 04:52 AM
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the only way to know how much you can safely mill off is to check your PTV clearance with your cam installed. use your old compressed gaskets and clay the motor. see how much clearance you have then go from there to mill off a safe amount.
oh and the guy who say 265cc is WAY off. more like 205cc, 243's and 317's are about 215cc
oh and the guy who say 265cc is WAY off. more like 205cc, 243's and 317's are about 215cc
12-27-2015, 02:43 PM
#15
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Hey guys while we are on the topic of milling and cc's, I'm getting ready to swap in a set of 243's milled 0.020, install a 0.35 head gasket with 0.050 valve reliefs flycut into the stock pistons. Would anyone have an idea of what cc this would be or what compression ratio?
12-27-2015, 04:57 PM
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[QUOTE=02*C5;12406992]Don't waste your time with milling 241s castings they flow like **** and no matter what you do to them you will waste your money. I learned my lesson the hard way. Save your money and when you can get a set of 243s have a reputable shop mill and CNC them and it will be a different car altogether.
Not sure why everyone claim 241s are crap? Are 243s better...yes they are but I would not call 241s crap, AI claim they can gain 50HP when they port a set of 241s, and if you already have a set the bang per dollar isn't bad compared to buying a set of aftermarket heads or buying a set of 243's for $400 and having them ported. However I'll end with this note, if you have big plans then I would just save up for a good set of heads, but 241s or 243s do very well with a good port job.
Not sure why everyone claim 241s are crap? Are 243s better...yes they are but I would not call 241s crap, AI claim they can gain 50HP when they port a set of 241s, and if you already have a set the bang per dollar isn't bad compared to buying a set of aftermarket heads or buying a set of 243's for $400 and having them ported. However I'll end with this note, if you have big plans then I would just save up for a good set of heads, but 241s or 243s do very well with a good port job.
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