Casting Numbers? 241 casting heads
11-29-2007, 08:13 PM
#1
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Casting Numbers? 241 casting heads
I have 241 casting heads for my 02 z-28. WHat exactly does the casting number mean? Im thinking about ported ls6 heads or ported ls1 heads... Any real difference between the two? May be before porting, but what about after?
11-29-2007, 10:59 PM
#2
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The 241 are the latest LS1 castings, which I believe started in 2001. They don't provide any major performance increase over the previous heads...maybe a few cfm and horsepower over previous castings.
The difference between the LS6 and LS1 quite significant.... less combustion chamber volume and bigger intake runners on the LS6, which lead to more power via more compression and more peak flow.
LS6 heads can be ported leagues beyond the LS1 stuff as well, but like anything else, it all depends on who ports them.
Mike
The difference between the LS6 and LS1 quite significant.... less combustion chamber volume and bigger intake runners on the LS6, which lead to more power via more compression and more peak flow.
LS6 heads can be ported leagues beyond the LS1 stuff as well, but like anything else, it all depends on who ports them.
Mike
12-01-2007, 03:55 AM
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I have a set of perimeter bolt 98 vette LS1 castings in the shop laying next to a set of 241 castings and they are the same heads in the ports and chambers. They will flow the same on the bench as well.
LS1 castings are LS1 castings, nothing real trick between any of them.
The small truck castings, 6.0L truck castings (317) and 243 (LS6,LS2 and new 5.3 trucks) are all different. The 243's being the best of the bunch.
Bret
LS1 castings are LS1 castings, nothing real trick between any of them.
The small truck castings, 6.0L truck castings (317) and 243 (LS6,LS2 and new 5.3 trucks) are all different. The 243's being the best of the bunch.
Bret
12-01-2007, 08:18 AM
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I have a set of perimeter bolt 98 vette LS1 castings in the shop laying next to a set of 241 castings and they are the same heads in the ports and chambers. They will flow the same on the bench as well.
LS1 castings are LS1 castings, nothing real trick between any of them.
The small truck castings, 6.0L truck castings (317) and 243 (LS6,LS2 and new 5.3 trucks) are all different. The 243's being the best of the bunch.
Bret
LS1 castings are LS1 castings, nothing real trick between any of them.
The small truck castings, 6.0L truck castings (317) and 243 (LS6,LS2 and new 5.3 trucks) are all different. The 243's being the best of the bunch.
Bret
12-01-2007, 01:17 PM
#7
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Yes I have flowed them and either way LS1 castings, reguardless of casting numbers or years are nothing special. Either way WHY care unless you are running a legal NHRA/IHRA stocker, put a head in there that has some short side and you will be much better off.
The differences are external the port cores are the same.
Bret
The differences are external the port cores are the same.
Bret
Last edited by SStrokerAce; 12-02-2007 at 01:16 PM. Reason: I love to get my posts edited by people who lie about their cars
12-01-2007, 01:24 PM
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Not to jack, but I've been wondering this myself..
Does the casting # have anything to do w/ int/exh wall thickness? I've hear that a certain manufacturer take a certain casting and punches the head out to obtain optimum flow, but in turn the INT walls were literally PAPER thin! A couple people have dropped rocker studs/mounts due to head failure.. Smell what I'm steppin in? Or did I go off on a tangent?
Good stuff here... I'm going to throw it in my stickey..
Does the casting # have anything to do w/ int/exh wall thickness? I've hear that a certain manufacturer take a certain casting and punches the head out to obtain optimum flow, but in turn the INT walls were literally PAPER thin! A couple people have dropped rocker studs/mounts due to head failure.. Smell what I'm steppin in? Or did I go off on a tangent?
Good stuff here... I'm going to throw it in my stickey..
Last edited by Bayer-Z28; 12-01-2007 at 10:26 PM.
12-01-2007, 01:34 PM
#9
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No that's entirely possible. The easiest way to figure out wall thickness if the port core (inside) is the same is put the heads on a scale, usually the lighter one has thiner walls. Then you can get a spare head and cut it up to measure local thicknesses.
Looks like they are chasing flow bench numbers again.
Looks like they are chasing flow bench numbers again.
12-01-2007, 10:30 PM
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Another bone-head question... Forgive me on this one.. I never understood the Casting #'s thing at ALL!
Is the Casting number relative to the different intake/exh port or CC design?? Such as the LS1 heads being slightly different and the LS6 heads being the slightly better flowing set? Such as the # referring to the style of heads?
*hides*
Is the Casting number relative to the different intake/exh port or CC design?? Such as the LS1 heads being slightly different and the LS6 heads being the slightly better flowing set? Such as the # referring to the style of heads?
*hides*
Last edited by Bayer-Z28; 12-01-2007 at 10:33 PM.
12-02-2007, 01:15 PM
#11
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Hell if you don't know something you gotta ask... I had to ask a bunch of guys from Missouri what "gigin" frogs was before I knew.
Yes heads have a casting number on them that will have the last 3 or 4 numbers displayed on the head someplace. LS series heads has that on one end of the head right next to the valve cover rail.
LS1 heads are commonly 241 castings
LS6, LS2 and the 2007 5.3L trucks are 243
6.0L Iron Block truck motors are 317
4.8L and 5.3L truck motors are 853 (I think)
The L92, LS7 and C5R heads all have numbers as well but it's easier to just look at the rest of the head to tell what it is, but those all bo by a 4 digit number.
Bret
Yes heads have a casting number on them that will have the last 3 or 4 numbers displayed on the head someplace. LS series heads has that on one end of the head right next to the valve cover rail.
LS1 heads are commonly 241 castings
LS6, LS2 and the 2007 5.3L trucks are 243
6.0L Iron Block truck motors are 317
4.8L and 5.3L truck motors are 853 (I think)
The L92, LS7 and C5R heads all have numbers as well but it's easier to just look at the rest of the head to tell what it is, but those all bo by a 4 digit number.
Bret
12-02-2007, 04:44 PM
#12
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Hell if you don't know something you gotta ask... I had to ask a bunch of guys from Missouri what "gigin" frogs was before I knew.
Yes heads have a casting number on them that will have the last 3 or 4 numbers displayed on the head someplace. LS series heads has that on one end of the head right next to the valve cover rail.
LS1 heads are commonly 241 castings
LS6, LS2 and the 2007 5.3L trucks are 243
6.0L Iron Block truck motors are 317
4.8L and 5.3L truck motors are 853 (I think)
The L92, LS7 and C5R heads all have numbers as well but it's easier to just look at the rest of the head to tell what it is, but those all bo by a 4 digit number.
Bret
Yes heads have a casting number on them that will have the last 3 or 4 numbers displayed on the head someplace. LS series heads has that on one end of the head right next to the valve cover rail.
LS1 heads are commonly 241 castings
LS6, LS2 and the 2007 5.3L trucks are 243
6.0L Iron Block truck motors are 317
4.8L and 5.3L truck motors are 853 (I think)
The L92, LS7 and C5R heads all have numbers as well but it's easier to just look at the rest of the head to tell what it is, but those all bo by a 4 digit number.
Bret
How about you get my motor out of your avator and call me? Ignoring me is not helping the situation.
12-02-2007, 05:15 PM
#13
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