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799 Heads??

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Old Sep 11, 2009 | 12:22 PM
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Default 799 Heads??
Saw a guy selling these and said they flow just as well as the 243/317 castings. Is this true? Are they worht the buy over my current 853 abd 241 heads?
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Old Sep 11, 2009 | 12:38 PM
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Same as the 243's, but with a new manufactured casting #.
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Old Sep 11, 2009 | 04:20 PM
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what engines are the 799's on?
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Old Sep 11, 2009 | 04:32 PM
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Originally Posted by JeaneGrae
Saw a guy selling these and said they flow just as well as the 243/317 castings. Is this true? Are they worht the buy over my current 853 abd 241 heads?
yes, to all of the above?
was it my posting u saw, becaus i have some listed now
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Old Sep 11, 2009 | 04:33 PM
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Originally Posted by CoastieWS6
what engines are the 799's on?
found on many 05+ vehicles
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Old Sep 11, 2009 | 06:29 PM
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Before I bought my 799 heads, I made a similar post and did a lot of searching.

Some LS2 Corvettes came with 799 heads, and some even had one 243 and one 799!

Most people don't know about them and sell them for cheap.

I got mine for $120.
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Old Sep 11, 2009 | 09:22 PM
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Originally Posted by jetlag
Before I bought my 799 heads, I made a similar post and did a lot of searching.

Some LS2 Corvettes came with 799 heads, and some even had one 243 and one 799!

Most people don't know about them and sell them for cheap.

I got mine for $120.
wow, what a steal!
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Old Sep 29, 2009 | 02:19 PM
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is there any difference in the valves from 243/799, i mean, is it true that only the ls6 243 castings came with sodium filled valves. or is this true to all 243/799 castings?:
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Old Sep 29, 2009 | 03:47 PM
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Originally Posted by JAX04
is there any difference in the valves from 243/799, i mean, is it true that only the ls6 243 castings came with sodium filled valves. or is this true to all 243/799 castings?:
only the true ls6 243 came with the sodium filled valves, no other cathedral port heads came with them. however the ls3 are supposed to have sodium filled valves irrc.
regular 243 and 799 come with solid valves. includes ls2
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Old Sep 29, 2009 | 06:57 PM
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Typically what gains do you get from a set? what size are the combustion chambers?
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Old Sep 29, 2009 | 07:04 PM
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Originally Posted by JeaneGrae
Typically what gains do you get from a set? what size are the combustion chambers?
car make 490rw with unported 243 and 2.02 valves, but on a 375ci engine.
so if anyhting they will support 500bhp+ in there stock form and stock valves with matched cam, supporting bolt ons and tune on a 5.7
chamber is 65cc, stock 243/799 will net around 10.5:1 on a 5.7 stock ls1 shortblock.
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Old Sep 29, 2009 | 07:24 PM
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Do you think 400 is possible with my current mods plus the addition of long tubes, underdrive pulley, 220/220 cam and tune?
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Old Sep 29, 2009 | 11:55 PM
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Originally Posted by CoastieWS6
what engines are the 799's on?
Pretty sure they are off 4.8/5.3 GM Trucks.......
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Old Oct 1, 2009 | 10:17 PM
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I my L33 engine came w/ 799 heads too. It was out of an 05 Silverado 4x4
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Old Nov 11, 2009 | 08:20 PM
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Default 799
Im getting a set hopefully Sunday for 250.00 not quite 120 but I think its good.

Originally Posted by jetlag
Before I bought my 799 heads, I made a similar post and did a lot of searching.

Some LS2 Corvettes came with 799 heads, and some even had one 243 and one 799!

Most people don't know about them and sell them for cheap.

I got mine for $120.
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