95GreenZ28

iTrader: (70)

I want to have a set of heads ported by a guy here in town. What are the best casting numbers to use as a base for ported heads? Thanks in advance guys

headed-ws6

iTrader: (34)

If your talking about stock heads I would say that the 241 casting number is the best way to go if you want a ported set. next step up would be the LS6 243 casting.

JPH

iTrader: (2)

#243/#317 are very good.

MPHmotorsports

iTrader: (18)

243's for sure.
I wouldn't even mess with the 241's, 806's,853's etc.
Unless your gonna do a 5.3 head, but I perfer the LS6 243's.

Z28/2002

iTrader: (27)

go with the 243s

WS6TransAm01

iTrader: (13)

its all about the 243's

I have a set of ported 243 heads and am making 508rwhp on a stock ls1 shortblock.

staringback05

iTrader: (8)

depends on what you have and what you want....241s if you have them stock, 243s for better flow, 706sfor higher compression....soooo

headed-ws6

iTrader: (34)

317's for lower compression they are 72cc chambers

staringback05

iTrader: (8)

excuse me i meant 706s for higher compression

Tainted

iTrader: (9)

i got ARE P&P #241 heads. but they came with my motor from speed inc. anyone know how much power those would be worth comapred to the 243 castings?


heres STOCK head casting #'s and info

853 97-00 aluminum 5.7
241 01-03 aluminum 5.7
243 LS6 aluminum 5.7
852 and 706 99 and up 4.8-5.3 truck heads
873 99-00 LQ4 6.0 iron heads
317 01 and up LQ4 6.0 aluminum heads
035 02 and up LQ9 6.0 aluminum heads


Even more info:

Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12559853 (1997-98)
12559853 (1999-00) (not sure why same PN)
12564241 (2001-03)
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches


Casting Number 243
Head: 2001 LS6 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12564243
Combustion Chamber Volume: 64.45cc
Compression Ratio: 10.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 373
Head: 1999-2000 LQ4 6.0 Litre Truck
Material: Cast Iron
Part Number:
12561873
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 317
Head: 2001+ LQ4 6.0 Litre Truck
Material: Aluminimum
Part Number:
12572035
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

staringback05

iTrader: (8)

well if their already P&P depending on the job, id say there going to flow as well or more then the ls6 heads....once again depending on the flow job

Tainted

iTrader: (9)

well like i said agustino raceing did it. they sued to be really big back when the ls1 first came out then they split. fraser at speed inc said they should be pretty good, but im wondering how good.. I wanna put down 400rwhp+ with my 228R cam and the more the merrier!


to the OP: hope that head info helps ya some!

staringback05

iTrader: (8)

well if they have been ported and you have a 228 cam, you should be able to make 400 no problem....

i understand who ported them but that still doesnt tell how far of a port job they did

Tainted

iTrader: (9)

wish their site had some ifo, but i guess i could call them as well.

the only thing about me putting down 400rwhp+ is im gonig through a 3k stall so im gonna loose a big chunk on a dyno

staringback05

iTrader: (8)

numbers are numbers man.....dont so much worry about your power as what you can do at the track....you want to take the stall out and be the guy who says hey look i made huge numbers....but my car is slow

or do you want to be the guy who makes 380 and runs 11s?....not to say you still wont be above 400, your not going to lose that much

Tainted

iTrader: (9)

well my ultiamte goal is a very high 11 (11.8's) very low 12's (12.0-12.1) consistantly so hopefully i can pull it off. id just like high dyno numbers so i can buy a pretty little plaque to put near the radio jsut for bragging rights

staringback05

iTrader: (8)

with that cam and stall many people are running 11.9s.....

Tainted

iTrader: (9)

sounds good to me. i may upgrade to a fast 90 intake, but i wanan get a pulley first. ill start digging into the suspension before long, that should make me more consistant

staringback05

iTrader: (8)

id get into the suspension work ahead of the pulley and the intake

95GreenZ28

iTrader: (70)

Thanks for the replies guys. I am running the msv4 and I am wanting ported heads. I just wanted to know which stock heads would be the best to start a port job on. I have a local guy here that says he can do excellent things with the 243 castings so I will go with those unless there are some that flow close to those for cheaper