241's milled
06-23-2009, 01:45 PM
#1
241's milled Is is possible/ worth the money to take factory 241's have them ported and milled to give a stock bottom end LS1 a 11:1 compression? If can that be done with out causing interfreance with piston with a 224/224 cam?
Or is the money worth spent buying aftermarket heads?
Or is the money worth spent buying aftermarket heads?
06-23-2009, 02:07 PM
#3
I did it had the over size valves done 2.02/1.60 and I am running 11.5 compression with no issues and I am flowing about 305@600 lift to include a port and polish and it all ran me $1560. Oh and the cam is a 232/238 600/600 and am shifting @6500. I am getting 3.42 gears cause I am running 3400 stall to 3.15 and after market 4L60E and I'll be shifting now about 6800 making about 440 with 3.42 out of an automatic keeping the same stall.
Last edited by 02*C5; 06-23-2009 at 02:13 PM.
06-23-2009, 02:14 PM
#5
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I would definately say its possible with that cam, always best to check though. I have ported and milled 241 castings (so I could keep the factory casting number on them) but if I could do it all again I would just buy a set of ported and milled 243s very reasonably priced for all the machining that will have to be done to your factory 241 (valve job, inspection, cleaning, milling, etc
06-23-2009, 02:19 PM
#7
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if you search on here, you will find very impressive numbers from folks running worked over 241's,,,,lots of folks just say 243's, and thats great if you've got a lot of money laying around,, but for the $ ,,, 241's are great when worked (they are not bad stock either when you look at it)
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
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06-23-2009, 02:24 PM
#8
if you search on here, you will find very impressive numbers from folks running worked over 241's,,,,lots of folks just say 243's, and thats great if you've got a lot of money laying around,, but for the $ ,,, 241's are great when worked (they are not bad stock either when you look at it)
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
06-23-2009, 02:46 PM
#9
if you search on here, you will find very impressive numbers from folks running worked over 241's,,,,lots of folks just say 243's, and thats great if you've got a lot of money laying around,, but for the $ ,,, 241's are great when worked (they are not bad stock either when you look at it)
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
Up to .400 lift? So that basically means the money you pissed away on getting 241's all done up is a waste unless you not putting a different cam in it as well.
06-23-2009, 02:56 PM
#10
I would say if you go through the trouble of having your heads ported, polished and milled and do not add a cam then really you just pissed away money regardless 241's or 243's. My buddy has 243's I am at 305 and he is at 325 those 20cfm's haven't done a thing for him because in the 1/4 I beat him by .2 every time out and his set up is not that much different than mine except he is a stick and I am auto and he is pushing about 30hp more because he is stick.
06-23-2009, 03:14 PM
#11
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Up to .400 lift? So that basically means the money you pissed away on getting 241's all done up is a waste unless you not putting a different cam in it as well.
You just made the point even stronger....if thats the case, wouldnt slappin on 243's be a much bigger waste if not adding a cam? By your logic,, I guess id rather waste 500 bux than 1500.
06-23-2009, 03:14 PM
#12
I would say if you go through the trouble of having your heads ported, polished and milled and do not add a cam then really you just pissed away money regardless 241's or 243's. My buddy has 243's I am at 305 and he is at 325 those 20cfm's haven't done a thing for him because in the 1/4 I beat him by .2 every time out and his set up is not that much different than mine except he is a stick and I am auto and he is pushing about 30hp more because he is stick.
06-23-2009, 04:34 PM
#17
OP, my 243's are milled to 62cc's and with a .045 gasket its 11:1. Im not sure how much needs to come off of 241's to get to 62cc's but the machine shop should be able to tell you that.
Sorry for screwing up your thread by the way.
06-23-2009, 05:40 PM
#18
Can you get away with just milling the heads and nothing else your wasting you time and money. Save some cash and do it right. Head/Cam headers, intake, stall if auto 4.10 for a stick or 3.42 for an automatic daily driver. You can do 3.73's but your MPG's will suffer. a 3600 stall and a hell of a tune. That should be the way to go anything else and your really hurting more than helping. That is because it will come a time that because you milled the heads to run on a compression ratio for a stock cam then you'll either have to mill them again or get new ones if you go with a new cam. and so on.
06-24-2009, 10:12 AM
#20
ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...
With the .581 lift and the mild 224 duration, PTV clearance shouldnt be a problem.