How much HP does 243 heads add?
Q: How much HP does 243 heads add? A pair of 243 heads add up to about 20 horsepower (hp) on the GM’s bolt-on LS1 or LS6 engine. Since the engine already features an aggressive camshaft, it might experience a little bit more horsepower.
Are 243 heads any good?
The 243 heads deliver increased performance and extra boost – a flow boost of up to 32.2 cfm and 28.5 cfm on the intake and exhaust ports and a horsepower boost of up 20 hp. Its superior casting and better airflow, along with incredible design, make it a desirable choice.
What compression ratio is a LQ9?
10.1:1
LQ9 Performance Specifications
| Engine Ratings | |
|---|---|
| Compression Ratio | 10.1:1 |
| Horsepower Rating | 345 hp |
| Torque Rating | 380 ft./lbs. |
Are 243 or 706 heads better?
Test after test has shown the 706 heads to have a more powerful output over the majority of the RPM curve when compared to stock 243 heads.
What engine comes with 243 heads?
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. The latter offered 6cc larger combustion chambers to accommodate the working style vs. speed and acceleration.
Which LS head is 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.
Did the 5.3 come with 243 heads?
The 4.8 and 5.3 come with 799(243) heads from the factory nowadays.
How much HP can a LQ9 handle?
The LQ4 and LQ9 have very strong blocks. They can handle over 1,000 hp.
Does LQ9 require premium gas?
Premium fuel (92 octane or higher) is recommended with the LQ9.
Which LS heads flow best?
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.
Which LS heads are best?
What car 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 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. 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.
Which motor is 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.
Is a LQ9 a LS2?
The LQ9 is a GEN III based engine, easily interchangable with LS1 cars and still interchangeable with LS2’s with a few tweeks. LS2’s have a different reluctor, and the cam sensor is on the timing cover.
What is the difference between LQ4 and LQ9?
What did 317 heads come on?
According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads.
Which heads are better 706 or 317?
Are 706 heads better than 317 heads?
See all 21 photos 706 vs. 317 Modified (NA) 5.3LRight off the bat, it is obvious that the stock 5.3L 706 heads easily outperformed the 6.0L 317s. This was even more impressive when you consider the fact that the 317 heads offered more flow, larger ports, and larger intake valves.
How much horsepower does a LQ9 6.0 have?
345 hp
LS Family: Gen. 3, 6.0L, Iron Block, Truck Engines
| Performance Specifications | |
|---|---|
| Compression Ratio | 10.1:1 |
| Horsepower Rating | 345 hp |
| Torque Rating | 380 ft./lbs. |
How much HP does a LQ9 have?
The LQ9 was introduced in 2002 for the Cadillac Escalade and was found in top-of-the-line trucks until 2007. It cranked out 345 horsepower, had 10.1:1 compression, and had other nice features like full-floating pistons.