243 casting heads question..
#4
TECH Junkie
iTrader: (100)
LS6 were 3.898 bore where LS2 are 4.060, so do they both require the same size/bore head gasket if used on an LS1?
#5
How would you tell if they are sodium filled valves? i just bought a set of what were siad to be ls6 243 heads and they have the yellow springs and yellow marks on the valves they are brand new.
#6
TECH Senior Member
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ls6 supposed to be fitted with yellow springs and the lite sodium filled valves, the valves themselves weigh less than a reg steel valve. the 243 casting itself is same for all.
799 is also same design as 243 as far as intake and exhaust ports, chambers.
ls2 were used on 4.00 bore, but chamber is same for all.
will need 4.00+ bore if using 243 on 4.00 block.
have to weigh the valves to verify if really ls6 version
799 is also same design as 243 as far as intake and exhaust ports, chambers.
ls2 were used on 4.00 bore, but chamber is same for all.
will need 4.00+ bore if using 243 on 4.00 block.
have to weigh the valves to verify if really ls6 version
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#8
TECH Addict
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Yes both can be used on either block either way, however according to the info I have read the sodium filled valves rev much higher much easier due to the weight, by comparison. Would you tell the difference in an average street car, I kind of doubt it, but would you see a difference on a side by side dyno.....probably.
#10
TECH Junkie
iTrader: (33)
To help clear this up. The bare head itself is the 243 casting, when they get cast they probably have no idea what valve is going into it. The 799 is the exact same design just cast at a different plant. So if there is a problem it can be more easily traced to the source. As far as flow numbers LS6 243s, LS2+ 243s and 799s should all be relatively the same.
The LS6 valve is .023" longer than the standard LS1 valve, I would assume that the LS2 uses the same valve as the LS1. Pushrods may to be longer or shorter for the best contact pattern, but it would depend more on the rest of the setup than the valves.
The LS6 valve is .023" longer than the standard LS1 valve, I would assume that the LS2 uses the same valve as the LS1. Pushrods may to be longer or shorter for the best contact pattern, but it would depend more on the rest of the setup than the valves.
#13
TECH Senior Member
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LS6 Z06 243's had hollow intakes and sodium filled exhaust. Made from 01-04 IIRC. The sodium was in the exhaust valve to absorb the extra heat while the intake lowered weght and allowed the stock motor to redline at 6500.
Any other 243/799 casting had solid steel valves and are basicaly identical..
#16
TECH Veteran
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To answer your question you would make about 380-390 crank hp. There are better cams out there so I wouldn't go thru the trouble of putting an LS2 cam in the motor.
#17
Congrats rookie on popping your cherry. You just replied to a 3 1/2 year old thread that was started 4 1/2 years ago.
To answer your question you would make about 380-390 crank hp. There are better cams out there so I wouldn't go thru the trouble of putting an LS2 cam in the motor.
To answer your question you would make about 380-390 crank hp. There are better cams out there so I wouldn't go thru the trouble of putting an LS2 cam in the motor.
I always thought the 799 was always used for trucks and had a larger combustion chamber to lower trucks compression. I also assumed ( I know, mistake) this is why alot of people liked the 799 heads for turbo builds.