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.

What LS 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. Often used for turbo and supercharger applications.

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.

What size valves are in 317 heads?

About to order some CNC’d 317 heads with LS6 springs. The heads come assembled with GM 2.00 Intake and 1.55 exhaust valves. For $300 more, they’ll include stainless steel 2.05 intake and 1.65 exhaust.

What’s better LQ4 or LQ9?

The ONLY difference between an LQ4 and LQ9 is the piston! The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. … The LQ9 is a limited production engine and VERY desirable as it is the HO 6.0L and comes with a premium price.

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.

What do 317 heads come on?

The 317 heads are often used on turbo small-block 5.3L builds, but the lack of compression really takes its toll on power.

What heads came on LQ4?

The 1999-2000 LQ4 had cast iron cylinder heads. All others had aluminum heads.

What engine did 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.

What heads do LQ9 have?

The LQ9 is a 6.0L Gen.
…
LQ9 Cylinder Heads.
LQ9 Cylinder Head Specs
Exhaust Valve Diameter 1.550 in.
Cylinder Head Bolt Style Torque to Yield (TTY)
Cylinder Head Bolt Size 2002-03 (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45
Cylinder Head Bolt Size 2004-07 (10) M11 x 2 x 100, (5) M8 x 1.25 x 45
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Feb 2, 2018

Are L92 heads good?

Better yet, the low-lift numbers were amazing-225 cfm at . 200-inch lift shows how these heads help make big torque in the SUVs that GM is kicking out. … If you’ve got a 400-inch motor or bigger, the L92 heads will be killer. Those big intake ports on a big-inch LS engine will really make some power.

What heads came on 4.8 LS?

The LR4 is a 4.8L iron block truck engine that was introduced in 1999. Along with the LM7 and LQ4, they were the first LS truck engines.
…
LR4 Cylinder Heads.
LR4 Cylinder Head Specs
Exhaust Port Shape Oval
Exhaust Runner Volume 70cc
Intake Valve Diameter 1.890 in.
Exhaust Valve Diameter 1.550 in.
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Feb 7, 2019

What is the LQ4 engine?

The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. … These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide.

Can you put LS6 heads on LS1?

The LS6’s sodium-filled valves are available through GM — part No. 17801930 — and are a direct retrofit for the LS1 heads, as are the LS6’s valve springs.

What LS motor has 821 heads?

LS3
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.

How much horsepower does a 6.0 Vortec have?

6.0L Vortec 6000 Engine Specs (LQ4, LQ9, L76, LY6)
6.0L Vortec V8 Engine Specs LQ4
Horsepower: 300 hp @ 4400 RPM
Torque: 360 lb.-ft. @ 4000 RPM
Bore and Stroke (in / mm): 4 x 3.62 / 101.6 x 92
Compression Ratio: 9.4:1

How do I identify a 6.0 LS engine?

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.)

Can you put LS3 heads on a LQ4?

Lightweight LS3 valves can be cut to fit the seats and performance valve springs can be installed to decrease valve float. … A popular upgrade to the LQ4 and LQ9 is to install a set of LS3 heads and intake. The LS3 heads will fit on any LS block with a minimum 4.000 in. bore.

How do I know what LS cylinder head I have?

Are 5.3 and 6.0 blocks the same?

Flassh, Actually the 6.0 motor is the same small block that the 5.3 utilizes. The 5.3 is 327 cu. in. and the 6.0 is the same block bored to a 366 cu.

How much HP can you get out of a 6.0 LS?

If we were to run the 6.0L in stock trim, the resulting power output would be around 400 hp (on this dyno the way we test). If we apply 14.5 psi from our turbos to the stock 400hp engine, we might get 800 hp.