Which LS heads are the best?
Which LS heads are the best?
The LS6 was designed specifically by GM to surpass the LS1 as the best performance head, and it did such a good job that the “243” casting was recycled on the LS2. Aside from the LQ9, which is a copy of the LS6, these are the best performing of the OEM cathedral ports.
Are 706 or 799 heads better?
The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points. The chamber volume on the 799 heads was within 2.5 cc’s of the 706 heads, but the dyno indicated this did not translate into power on our test engine. The peak numbers were certainly close (473 hp vs.
Are LS 862 heads any good?
In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5.3 heads that will best suit your car. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice.
Are 243 heads good for LS1?
I got about 50 hp on my LS1 Corvette with unported 243 heads and a modest cam swap with a tune. The 243 heads flowed plenty well.
Are 706 heads better than 862?
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 did 799 LS heads come on?
799 heads came on trucks manufactured around 2005 and above, as well as newer models of 5.3 and 4.8-liter trucks, come with 799 heads. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010.
What year did 5.3 have 243 heads?
Of course, the 5.3, as well as the 4.8, come with factory-designed 243 heads nowadays. The LS6 engine designed between 2001 and 2006 came with 243 heads. You can ascertain the 243 heads on 5.3 by checking the stamping with three-digit near the valve cover.
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.
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.
