What LS comes with 317 heads?

New GM LS 317 Head – 6.0L. 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.

Which LS heads are 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.

What are the good 5.3 heads?

GM’s 706 Vortec heads are the cheapest and most effective heads you can use for your 5.3L, or 4.8L, or even some 6.0L LS engine build.

What are 317 heads good for?

The massive chamber volume of 71.5 cc’s put them a full 10 cc’s over the 706 heads. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). The 317 heads are often used on turbo small-block 5.3L builds, but the lack of compression really takes its toll on power.

How good are LS 317 heads?

The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. The peak flow numbers differed by just 7 cfm at 0.700 lift. What made the 317 heads both kissed and cursed was the combustion chamber size. The massive chamber volume of 71.5 cc’s put them a full 10 cc’s over the 706 heads.

What did the 6.0 LQ9 come in?

The LQ9 was an improved, high-output version of the LQ4. It was introduced in 2002 for the Cadillac Escalade. It was available in the Escalade and GM pickups until 2007. The LQ9 was also known as the Vortec HO 6000 or the VortecMAX.

How big is a LS cylinder head in inches?

Designed specifically for a 6.0L application, the 317 heads also had the largest chamber diameter of 3.923 inches. In. As expected, the 799 heads offered the highest peak flow, with 250 cfm coming at 0.700-inch lift—though a value not generally relevant to most LS enthusiasts.

How much horsepower does a GM Performance LS7 cylinder head have?

First run with the GM Performance CNC LS7 heads, the 495 stroker produced 773 hp at 6,300 rpm and 704 ft-lbs of torque at 4,700 rpm. After installation of the Texas Speed LS7 heads, the power output jumped to 796 hp and 725 ft-lbs of torque.

Which is better 706 or 799 LS cylinder heads?

Modified 5.3L Head Test: 706 vs. 799 This is the test everyone wanted to see, and the one every LS owner will be talking about. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points.