What heads come on a LS6?
The 5.7L LS6 is the most powerful Gen. 3 small block engine as it came from the factory. It is an improved version of the LS1 produced for the 2001 Z06 Corvette….LS6 Cylinder Heads.
| LS6 Cylinder Head Specs | |
|---|---|
| Combustion Chamber Volume | 65cc |
| Intake Port Shape | Cathedral |
| Intake Runner Volume | 210cc |
| Exhaust Port Shape | D-Port |
Are 706 and 862 heads the same?
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.
What engines came with 862 heads?
The 862 heads are also the most affordable option and completely rebuilt for LM4, LM7, and 5.3LS engine builds.
What engine has 799 heads?
According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads….799 Heads.
| 799 6.0L (and 5.3L) Castings | ||
|---|---|---|
| Valve Size: Intake – 2.00, Exhaust – 1.55 | ||
| 0.400 | 230.2 | 160.1 |
| 0.500 | 243.4 | 175.5 |
| 0.600 | 248.1 | 185.8 |
What do 243 heads fit?
The 243 heads came on the LS6 engine produced from 2001 to 2006. It was typically found in the C5 Corvette, but it was eventually ported to the LQ4 and LQ9 to meet truck specs.
How much HP does 243 heads add?
A stock pair of 243 heads can gain about 20 hp on a bolt-on LS1. Since you already have a cam, you might see a bit more. If your budget does not allow a full porting job, don’t sweat it, just swapping to 243 alone will be a big help.
What are 821 LS heads?
The LS3 821 heads had hollow-stem valves, as did the LSA supercharged engine with the 863 heads. Heads for the LS9 used titanium intake valves like the LS7. The main difference between and LSA and LS9 head are the valves. The LSA heads also used a stronger rotocast A356-T6 alloy.
How do I know if I have a LS6 engine?
To tell the difference between the LS1 and LS6 blocks, look at where the head meets the block on the passenger side. If that little corner of block has a bullseye stamped on it, like mine does, it’s an LS1. If there is no bullseye, it’s an LS6.
What is the difference between 821 and 823 heads?
From what I understand there is no real difference in the 821 and 823 other than valves and springs. The Ls3 version has the light weight valves and better springs. There is another casting number for the L92’s that is suppose to be a rougher earlier design, that would be the one to avoid unless it’s ported.
What did 862 heads come on?
The 862 heads are on the GM’s LM7 engines. The cylinder heads are designed with aluminum materials with a 61cc combustion chamber volume. They also come with a cathedral-shaped intake port and an oval exhaust port.