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

 

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 +)

 

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.

 

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.

 

No problem

You can also check here

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

 

Very nice Z28/2002 and nice avatar btw!!

 

how much better are the 241 heads then the 853?

 

they are basically the same head design.

but there is your answer.

 

cool. thanks for the info