What LS has 799 heads?
799 heads are from 2005 and newer 4.8 and 5.3-liter trucks. 2/5/18 3:54 p.m.
Are 799 Chevy heads Cathedral Port?
Essentially a 243 head with different casting numbers, the 799/243 heads are considered to be the top of the line, factory, cathedral-port offerings. Tested on a flow bench, the 799 head offered right at 249 cfm at . 700 lift on the intake and 191 cfm on the exhaust.
Are 706 heads better than 862 heads?
The 706Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand cast. The SPM method is considered to be a more consistent process, but once you port the 862 head, any difference to the 706 head goes away.
Are there LS6 Springs in a LS2 head?
This appears to be one of the common misconceptions about heads having the 243 casting no. — they are not necessarily LS6 head assemblies. The LS2 heads (243 or 799 casting) have the “heavy” standard LS1 valves. However, they do have the LS6 springs.
What’s the difference between 799 heads and 243 heads?
243 heads came with 2.00 hollow stem intake valves (lighter) and 799 heads came with regular solid 2.00 intake valves. 243 came with sodiom filled stem 1.55 exhaust valves (lighter and more heat dissepation) and 799 came with regular solid stem 1.55.
Which is better LS1 or LS6 cylinder heads?
The LS6 cylinder heads is essentially a tuned-up version of the LS1 head. At 65cc, the combustion chamber is slightly smaller and more efficient than the LS1. The more efficient design shortens burn times and ultimately means less ignition timing advance is required to produce the same power.
Why are 241 cast heads used on LSX?
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.