What LS comes with 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.

What do stock 243 heads flow?

GM 243 (LS6) and 799 (LS2), 218 cc. The 218-cc LS6/LS2 head is a mild upgrade from the basic performance rebuild, which boosts flow by 32.2 cfm on the intake side and 28.5 cfm on the exhaust side, at . 600-inch lift, despite the more cost conscious machine work.

How much do 823 heads flow?

By contrast, the 823, rec-port heads featured a 2.165/1.59 valve combination and peak flow numbers of 317 cfm on the intake and 223 cfm on the exhaust.

Where are casting numbers on LS heads?

241 castings (the casting number is found near the corner of the head) are the most common since they were used on every 4.8L and 5.3L truck engine as well as the early LS1s.

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 much can you milled 317 heads?

. 030 is the limit you can mill them and even with the thinner gasket you wount make up the compression for the larger chamber.

How good are 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. 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).

What are L92 heads?

The New Sherriff In TownIf you have your headset tuned in to chatroom buzz, then perhaps you’ve heard about the L92 heads. They are production, rectangle-port, aluminum heads being used on the new 6.2L GM truck engines for 2007.

How do I know what 6.0 LS I have?

How Do I Know Which LS Engine I Have?

1. The 8th digit of the VIN.
2. By visual inspection. The easiest way to tell the difference is to check the 8th digit of the Vehicle Identification Number (VIN) on the original vehicle. (See below.)

How much do 317 heads flow?

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….317 Heads.

317 6.0L Truck Castings
Valve Size: Intake – 2.00, Exhaust – 1.55
Lift	In.	Ex.
0.050	33.3	24.5
0.100	63.4	54.2