Nabdrill

iTrader: (19)

First off... I know, I know

I've tried alot of different searches and can't come up with any posts that are specific to what I'm trying to learn.

Can someone give me a link to the post, or give the correct search lingo, or just list out some info on all the different casting #'s for lsx heads??!!??
I'm lost when I read about them. What applications for what #'s and what-not? What years had what #'s?

I'm certain that this has been addressed here many times, I'm just having trouble finding it, or maybe I'm just not a good searcher. Please help

sevenstarsfall

iTrader: (2)

I wasnt quite sure what all you wanted but heres some specs for the LS1 and LS6 heads:

Stock LS1 Heads:

Chamber Vol:66.67 cc

Compression Ratio: 10.1:1

Intake Port Vol: 200 cc

Exhaust Port Vol: 70 cc

Intake Valve Diameter: 2.00"

Exhaust Valve Diameter: 1.55"

Part Number: 12559853 (1997-98), 12559853 (1999-00), 12564241 (2001-03).

Stock LS6 Heads:

Chamber Vol: 64.45 cc

Compression Ratio: 10.5:1

Intake: 210 cc

Exhaust: 75 cc

Intake Valve Diameter: 2.00"

Exhaust Valve Diameter: 1.55"

Part Number: 12564243 (2001 +)

Z28/2002

iTrader: (27)

ALL Gen III heads are interchangable.


Here is a list of a few casting #'s:

933 97 aluminum perimeter bolt 5.7
806 97-98 aluminum perimeter bolt 5.7
853 99-00 aluminum center bolt 5.7
241 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 castings)
243 LS6 aluminum center bolt 5.7
862 and 706 99 and up 4.8-5.3 truck heads
873 99-00 LQ4 6.0 iron center bolt heads
317 01 and up LQ4 6.0 aluminum center bolt heads
035 02 and up LQ9 6.0 aluminum center bolt heads

Even more info:

Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12559806 (1997-98) Chambers = 69cc
12559853 (1999-00)
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

• It takes about .005" milling of the block deck to remove 1cc of volume. It takes .007" milling to remove 1cc from an LS1 head

Simple Milling Math:

You have a stock 66cc chamber and you want to get down to 63cc

66-63 = 3. You have to remove 3cc's

.007 x 3 = .021. So to get your 66cc chambers down to 63cc you'd have to mill ~.021.

You can also do the reverse, say you want to mille a head .030 to figure out how many CC's that removes you take .030 / .007 = ~ 4.28. Milling a stock 5.7 head .030 puts your chamber at ~ 62.

• 241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. Once ported any "advantage" the 241 cast had is moot.

Nabdrill

iTrader: (19)

That's exactly the information I was looking for... Thanks for the reply's but especially z28/2002. I'm not new to racing by any means, but I'm still newbie class on the LS1 cars... even after 2 yrs of having one.

Z28/2002

iTrader: (27)

No problem

You can also check here

http://www.mortec.com/castnum.htm

sevenstarsfall

iTrader: (2)

Very nice Z28/2002 and nice avatar btw!!

JTH2000SS

iTrader: (2)

how much better are the 241 heads then the 853?

jed.only

iTrader: (9)

they are basically the same head design.

but there is your answer.

JTH2000SS

iTrader: (2)

cool. thanks for the info