241 ported heads

[stupotarnie]

Hi guys, Just a quick question for the fellas with ported 241s. I am debating whether or not to get a set of ported 241s when i get a cam change, I am going for a 228 230 110 or 112 cam and want to know if the $1500 or thereabouts for what only seems to be a small hp gain is worth the cash as the standard heads are pretty good anyway I thought.

[dyno junkie]

I simply bought a set of 243's and had them reconditioned and used them when I did my cam swap.

[stupotarnie]

are the standard 243s alot better?

[blackvussii]

Im getting parts togeather for a cam swap at the moment and have picked up a set low k 243s, from what i have read ported 241 are better but the 243s give u a bump in compression and a bit more flow which should suit my smaller cam choice and my budget.

[stupotarnie]

cheers blackvu,what size cam you going for?

[blackvussii]

I've ordered a custom grind from EPS in the states, been reading a lot about them on ls1 tech. They are based on the comp lsr lobes but different profile which is meant to easier on the valve train with similar lift. I'm chasing torque for a daily driver without being too savage on fuel and a bit stealthy. They recommended 218/222 114lsa with about .595 lift. Should behave similar to a 220 but produce more a bit more power. I dont think ported heads will be worth it for my application. They came with yt rockers, pushrods + arp bolts which is why I decided to grab them.

[munz]

Stock LS1 241 Heads
Chamber 66.67 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 200 cc 67 122 178 215 219 223 227
Exhaust 70 cc 52 97 133 156 170 176 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)

Stock LS6 243 Heads
Chamber 64.45 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 210 cc 62 126 184 224 251 256 257
Exhaust 75 cc 57 108 143 163 176 180 183
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12564243 (2001 +)
LS6 valves are 0.6mm or 0.023622" longer, hollow stem intake, and hollow stem sodium filled exhaust valves.

LS6: intake = 73 grams, exhaust = 65 grams
LS1: intake = 101 grams, exhaust = 94 grams.



As you can see the LS6 243 head flows better out of the box and with the lower cc its an added bonus for compression


Hope this helps

[A PSYCHO]

excuse my ignorance, but what models got what heads?

[AllWheelSlide]

excuse my ignorance, but what models got what heads?

I think STD LS1 5.7 has 241 castings, and HSV LS2 has 243s. Price on fresh 243s through Holden/HSV will make you put a leg in the air.
To really confuse things are the offerings in the states.

[blackvussii]

ls1 (5.7) has 241s, Ls2 (6.0) has 243s, ls6 (high performance ls1) has 243s but with sdium filled valves.

[feistl]

So heres a question,

Ive currently got a set of 241 port and polished heads on my 383 stroker. Im upgrading the cam to something bigger, how much of a gain would i see going to a CNC'd 243s?

Or would i be better going something custom? Engine will be running a harrop hurricane intake, ~25x cam, 1 7/8" and Liquid Injection LPG. Will be aiming for around 350rwkw, so would my current heads be a problem?

Cheers

[Roonstain]

I've ordered a custom grind from EPS in the states, been reading a lot about them on ls1 tech. They are based on the comp lsr lobes but different profile which is meant to easier on the valve train with similar lift. I'm chasing torque for a daily driver without being too savage on fuel and a bit stealthy. They recommended 218/222 114lsa with about .595 lift. Should behave similar to a 220 but produce more a bit more power. I dont think ported heads will be worth it for my application. They came with yt rockers, pushrods + arp bolts which is why I decided to grab them.
Good work mate - you won't regret the decision to go with Geoff @ EPS!

[blackvussii]

Good work mate - you won't regret the decision to go with Geoff @ EPS!

Yeah I'm just playing the waiting game at the moment, yours was the only thread I could find about anyone running one over here. Sounds like it should be worth the wait. He has been great to deal with, answered a lot of questions. Going to get oil pump, gaskets, timing chain etc from speed inc and have a crack at installing it myself, then remote tune. Been doing lots of reading and pre-empting the tax cheque.:)

[stupotarnie]

Has anyone dealt with horsepower engineering in qld for their heads? If so what are your thoughts?.......CHEERS.

[Roonstain]

Yeah I'm just playing the waiting game at the moment, yours was the only thread I could find about anyone running one over here. Sounds like it should be worth the wait. He has been great to deal with, answered a lot of questions. Going to get oil pump, gaskets, timing chain etc from speed inc and have a crack at installing it myself, then remote tune. Been doing lots of reading and pre-empting the tax cheque.:)
There is two other people I know who have ordered and/or installed an EPS cam here - all 3 of us are mates and we have the same cam specced by Geoff for us! Bit bigger than yours though.

Back on topic though - IMO, if you are going to take the heads off, you may as well get the 241s cleaned up or some 243's - and change the lifters!

If it were my car, I would find a set of used 243s and get someone like Higgins, SQP, NJC or other reputable shop to set them up for what you want

[blackvussii]

I did enquire about getting mine touched up hand and he recommended a valve job - 2.02 int 1.57 exh plus bowl work but leaving the runners alone. Still expensive, if i do anyhing though i think it will be a .020 shave for a bit more compression.

[munz]

So heres a question,

Ive currently got a set of 241 port and polished heads on my 383 stroker. Im upgrading the cam to something bigger, how much of a gain would i see going to a CNC'd 243s?

Or would i be better going something custom? Engine will be running a harrop hurricane intake, ~25x cam, 1 7/8" and Liquid Injection LPG. Will be aiming for around 350rwkw, so would my current heads be a problem?

Cheers

feistl if your keen to spend money for horsepower your best to ditch the standard heads and go with AFR or trickflow especially with the harrop intake and a massive cam

[LooneyR8]

ls1 (5.7) has 241s, Ls2 (6.0) has 243s, ls6 (high performance ls1) has 243s but with sdium filled valves.


Not quite.

Early LS1 (VTII) had 853 Heads including HSV Variants, VX (LS6 Variant) had 241 Heads and pretty much every other performance variant ie: HSV, had 243s including the 6litre variant.

But back on track. If you can get 243 Heads definately get them if inside your price range but if not, then ported 241 heads will do nicely.

[stupotarnie]

Cheers guys...Will keep a lookout for a set of 243s. Hope there is enough at tax time in the bank after holiday we have planned...ha ha.

[sv300 - 75]

so what if i had a C4B motor and what ever heads they came with.
if i was to change the cam, would it be worth getting cnc'd 241's or even cnc'd 243's or even get my stock C4B heads cnc'd.

im after more throttle response and a little better low down torque.

[blackvussii]

The c4b already has Callaway ported 241s, meant to be a pretty good oem head. Depends on your budget and cam choice but I wouldnt bother

[WLDLS1]

take it from me. 243s all the way.
i have used them stock brand new out of the box and if you use the correct camshaft to suit you will make good horespower.
spend time and research cams to match the cc of the head.
you will be amazed. you dont need a big cam to make power.
matching the combo is the key.
cheers. Alan.

[Toast]

Weighing up costs/bang for buck, is it better to go with CNC'd 241s or get low km second hand 243s? Is there much of a price gap?

[macca_779]

Weighing up costs/bang for buck, is it better to go with CNC'd 241s or get low km second hand 243s? Is there much of a price gap?

Best bet is some cnc 243. But stock 243's vs cnc 241's will be the better choice every day of the week


Sent from my iPad 2 using Tapatalk

[sv300 - 75]

thanks for the advice guys. ill keep it in mind when choosing a cam :goodjob:

[macca33]

I've ordered a custom grind from EPS in the states, been reading a lot about them on ls1 tech. They are based on the comp lsr lobes but different profile which is meant to easier on the valve train with similar lift. I'm chasing torque for a daily driver without being too savage on fuel and a bit stealthy. They recommended 218/222 114lsa with about .595 lift. Should behave similar to a 220 but produce more a bit more power. I dont think ported heads will be worth it for my application. They came with yt rockers, pushrods + arp bolts which is why I decided to grab them.


I'm running a 215/223 @ 111lsa camshaft on my car and the heads DEFINITELY help out. It is making around 295rwkw.

Heads are much, much more than just power adders - they improve driveability and responsiveness also.

SV300-75 - the C4B heads had cnc-ported combustion chambers, which dropped the compression slightly. Taking .040" off them would see you up around 11:1 static comprssion, which is a nice place to be. Higgins would do a good job with them...:idea:

cheers

[berroca]

get a set of higgins 241 ported heads, best bang for your buck imho

you wont look back, i didnt

[Toast]

Best bet is some cnc 243. But stock 243's vs cnc 241's will be the better choice every day of the week

Yeah I'd like to go one further but I'm trying to stick to some sort of budget, it's slowly getting out of hand as it is :doh: I'm a bit taken back by Macca33's combo, bloody impressive!

CNC'd 241s mated with a 224/228 @ 112 would be a good thing for a daily driver then? Will it make much difference to fuel usage? (Not that I'm fussed, just curious)

[feistl]

feistl if your keen to spend money for horsepower your best to ditch the standard heads and go with AFR or trickflow especially with the harrop intake and a massive cam

Thanks mate, ill add it to the very long list of parts to get :P.

Another question, what would a set of manually port and polished 241 heads be worth second hand?

Cheers, Errol.

[h41ry]

i think u should just put the cam in and get it tuned save your $$$ for later on..u will be more than happy with just the cam change. aftermarket cams really liven the ls1 up. u may have a better idea later down the track as well as a few extra $$$ and might decide to go all out on a set of heads or something else maybe a set of diff gears

[stockergts]

As last post said save your money I have replaced my c4b heads with afr's but leaving the inlet stock until I get more money and get a cross ram intake

[SSZ.]

ive got a 232/236 and higgins just said to put the ported 241s on it, its in a vz, just wondering what power and 1/4 mile difference people noticed when doing heads???

ive been told heads will calm down the lumpyness off my cam if so im gona miss it:bawl: maybe need a bigger cam after haha

will have to check ptv this time tho (didnt check it when i installed cam) lift is prity high, another thing i have to research

[WLDLS1]

ive got a 232/236 and higgins just said to put the ported 241s on it, its in a vz, just wondering what power and 1/4 mile difference people noticed when doing heads???

ive been told heads will calm down the lumpyness off my cam if so im gona miss it:bawl: maybe need a bigger cam after haha

will have to check ptv this time tho (didnt check it when i installed cam) lift is prity high, another thing i have to research

mate thats alot of crap. heads will calm down the lumpiness of a cam.:confused: i cant stop laughing. not at you mate at the person that told you that. you wont need a bigger cam. the one you are using is ok. leave it.

[SSZ.]

yer i didnt think it was right, cant remember who told me that, was long ago, still, i wouldnt mind a bigger cam but ill use the one i got and do heads and maybe a manifold later, see how far down the 11s i can push it

[h41ry]

the best and cheapest gains on an ls1 is cam and diff gears
3.7 or 3.9 gears on there own can knock upto half a sec off your quater mile time

[stupotarnie]

cheers guys, Yeah thx h41ry I already have 3.9 diff so Im hopeing a cam will really get things moving....but I dont want to loose any bottom end torque.I think I will go for the 228 230/112.How would this cam go with a supercharger if I decide to go that way in the future?

[blackvussii]

From what I have read most FI cams are on the smaller side, have a bigger split and a wider lsa

[duke5700]

So heres a question,

Ive currently got a set of 241 port and polished heads on my 383 stroker. Im upgrading the cam to something bigger, how much of a gain would i see going to a CNC'd 243s?

Or would i be better going something custom? Engine will be running a harrop hurricane intake, ~25x cam, 1 7/8" and Liquid Injection LPG. Will be aiming for around 350rwkw, so would my current heads be a problem?

Cheers

If your spending that kind of coin why not move to some Trickflows or the like? Better head to begin with and you can match your runner size etc etc

Probably something for someone who builds engines to give you the answers.

[HSV99er]

cheers guys, Yeah thx h41ry I already have 3.9 diff so Im hopeing a cam will really get things moving....but I dont want to loose any bottom end torque.I think I will go for the 228 230/112.How would this cam go with a supercharger if I decide to go that way in the future?

I'll be adding a charger with that exact cam in the near future, I'll let you know the results.
If you want a similar size cam that will perform NA and suit FI a bit better why not use the 224/230 114, I kind of wish I had now.

[awesome _vzss]

I am looking at changing my heads,and after reading this thread I'm more confused then ever.
So if I was to get some used 243 heads and swap my valve springs over and a touch up tune will it be worth it or port my original heads.

[WLDLS1]

I am looking at changing my heads,and after reading this thread I'm more confused then ever.
So if I was to get some used 243 heads and swap my valve springs over and a touch up tune will it be worth it or port my original heads.

get some 243s. drop them to nathan higgins and let him do his magic. you will be very pleased. he gets very good results from them.
thats what i would do.

[stupotarnie]

I'll be adding a charger with that exact cam in the near future, I'll let you know the results.
If you want a similar size cam that will perform NA and suit FI a bit better why not use the 224/230 114, I kind of wish I had now.
thx hsv99er,Be interesting to see the results. What sort of charger are you going?

[WLDLS1]

I'll be adding a charger with that exact cam in the near future, I'll let you know the results.
If you want a similar size cam that will perform NA and suit FI a bit better why not use the 224/230 114, I kind of wish I had now.

thats the cam i ran in WLDLS1. but it was a isky not a comp.
it was 595/585.
never let me down.

[stupotarnie]

thats the cam i ran in WLDLS1. but it was a isky not a comp.
it was 595/585.
never let me down.
was the idle choppy?

[WLDLS1]

was the idle choppy?

depends on who tunes it. i had it tuned out. mine was done by phonz. (GM MOTORSPORT). i think the car had more throttle response when the lump was tuned out which suited me.

[A PSYCHO]

I'll be adding a charger with that exact cam in the near future, I'll let you know the results.
If you want a similar size cam that will perform NA and suit FI a bit better why not use the 224/230 114, I kind of wish I had now.

Thats the exact specs of my cam(224/230@114), and thats the reason i chose it. Works well NA and will be great when i charge it soonish.

[h41ry]

it doesnt really matter what cam u use in an ls1. even with alot of the bigger cams u get gains all round
if u were planning on supercharging i would suggest a cam for that application if not use a cam from the lsr comp series even aspirated they work really well

i have a vt ss with standard heads and intake with 4 into 1s twin 3" zorst 3.9 diff gears 3500 stall and otr using the 231/239 @ . 50and i have run 12.0 @ 115mph...it will do better but still sorting a few bugs....the last time out i ran a 12.0 @ 114 with a crap 60ft and hit the rev limiter

[HSV99er]

thx hsv99er,Be interesting to see the results. What sort of charger are you going?

Going to use a Maggie 1900 and run E85.