romanss

iTrader: (3)

I was wondering what the specific differences were between the 2 style heads.

Thanks,

Roman

Tin Indian

Casting Number 853 or 241
LS1
99-00 5.7L Passenger Car and Corvette (853)
01+ 5.7L Passenger Car and Corvette (241)
Material: Aluminum
Combustion Chamber Volume: 66.67cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 243
LS6
01+ 5.7L Corvette
Material: Aluminum
Combustion Chamber Volume: 64.45cc
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Tin Indian

Looks like you allready have LS6 Stage II heads...

romanss

iTrader: (3)

I know that I got LS6 (at least from what I've been told) but I have never seen the 2 beside each other and would like to be able to tell the difference between them.

There is a difference in the exhaust ports also right? D-shaped on the LS6 and oval LS1 right?

Thanks for the reply.

Roman

bigeller

iTrader: (2)

Yes the LS6 heads along with the LQ4, LQ9 heads have D shaped exhaust ports.. They also have raised floors, one of the reasons there is a better gain with the LS6 intake and those heads.. It's practically worthless to put an LS6 intake on stock pre '01 LS1 heads..

Z06PSI

iTrader: (33)

So there is a difference between the 98-00 Ls1 heads compared to the 01-02 LS1 heads.... pls educate me....

Cal

iTrader: (1)

Another difference is LS6 heads have hollow, sodium filled valves, making the valves much lighter.

PacerX

iTrader: (4)

Wait a sec...

There are pretty significant differences besides just the stats provided.

Specifically, the short side radius of the LS6 head is much larger than that of the LS1 head.

romanss

iTrader: (3)

Thanks guys,

One more question...

Anyone know what the deck height might be in the LS6 heads?

Thanks for the responses.

Roman

ReactiveSS

could someone anwser the above question is there a difference between the two LS1 Casting #853 & 241. I ask because I have a 2000/SS with the #241 heads, clearly Casted on the passenger side head. Would these heads #241 benefit from a mild home head porting project. Just wondering, sometimes these small issues can effect future mods.