What do 799 heads flow?

Not surprisingly, the 799 heads flowed the most, with a peak flow of 250.2 cfm at 0.700-inch lift. The 706 heads offered the lowest peak flow, checking in with a maximum of 237.1 cfm. via

Are 799 heads the same as 243 heads?

They're the same...but in factory form the 243 came on LS6 motors with sodium filled vavles and better springs. early LS2's had either 799's or 243's or a 799 on 1 side and a 243 on the other! I run 799's on my car. via

Are 799 heads any good?

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. via

What LS motor has 799 heads?

5.3L and 4.8L truck engines are LS engines designed with 799 heads. The cylinder heads perform amazingly on the truck engines. They are built with sophisticated architecture, including a cathedral-shaped port with smaller combustion chambers. via

What LS heads flow 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. via

What did LS 243 heads come on?

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. via

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. via

What are 799 heads made of?

799 heads are the most recent models in the market, which are cast using a semi-permanent mold method. Although they contain similar triangle casting marks like the 2004LS2 heads, they do not require cleaning like the 243s. via

What LS heads are Cathedral Port?

Cathedral port heads came on the original (Gen III) LS1, but were also used on the performance-oriented LS2 and LS6 versions. Cathedral port heads were bolted on literally millions of truck variants, which included (among others) the 4.8L LR4, the 5.3L LM7, and 6.0L LQ4. via

What heads came on LM7?

3 small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 5300. The information listed here is for the stock LM7 engine.
GM LM7 Engine Specs.

LM7 Cylinder Head Specs
Cylinder Head Bolt Size (1999-2003) (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45


What LS motor has 862 heads?

The 862 heads are on the GM's LM7 engines. The cylinder heads are designed with aluminum materials with a 61cc combustion chamber volume. via

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. via

What engine has 317 heads?

LQ4 engines received the Generation III 317 V8 head in 2001. It has cathedral shaped intake ports and D shaped exhaust. Its large combustion chamber results in lower compression ratios. via

Are 243 heads better than 241?

The 243 heads as used on the LS2 motor flow at 260 CFM on the intake. LS6 243s (CNCed) with sodium filled valves flow a little better at 280 on the intake. The stock 241 head flows at 220 on the intake. Either head is a considerable improvement. via

Are 862 LS heads any good?

Casting 862 heads proves beneficial even with the small valves of 1.89 intake, less than 2.00 valves, and smallest combustion chamber with the best compression ratio. They depict an excellent flowing head and provide higher compression. Beyond everything, 862 LS heads offer enormous power at a budget-friendly cost. via

How much does it cost to port and polish LS heads?

That could be a $1,000 question, if you go the fully ported route. On the low-end, you're looking at around $200 for a professional three-angle valve job with the existing 1.94/1.50 valves. Add bowl-porting and a set of big valves and you move up into the $500-$700 range. via

What trucks have 243 heads?

243 Heads - 1999-2013 Silverado & Sierra 1500 - GM-Trucks.com. via

Does 5.3 have cathedral port heads?

Cathedral port heads were bolted on literally millions of truck variants, which included (among others) the 4.8L LR4, the 5.3L LM7, and 6.0L LQ4. via

Are cathedral port heads better?

Applying the formula to our heads, we see that though the LS3 heads offer a better coefficient of discharge at the maximum lift of . 700, the cathedral-port head offered not only a superior coefficient of discharge from . 100-. 400 lift, but a better average coefficient of lift from . via

Will rectangle port intake work on Cathedral heads?

Compatible with: ANY Cathedral Port Heads and will adapt to ANY rectangle port intakes, supercharger or blower. via

Is the LM7 an iron block?

The LM7 (along with its L59 FlexFuel E85-capable brother) are the Gen. III, 5.3L iron block truck engines you can pick up in wrecking yards for about $600. via

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