ls6 vs ls1 heads

**jjc239** · 09-13-2010, 12:57 PM

is there a difference? i heard they can be a direct bolt on for a ls1. also i have a 2004 gto.

**derbs** · 09-13-2010, 02:20 PM

The ls6(243) are 2.00/1.57 intake and exhaust and if I'm right their 64cc chambers??? vs. the ls1(241) are 1.97?/1.50? intake and exhaust(I'm going to get murdered here for the specs) and with 67cc chambers?? you can gain up to 40hp with just changing the heads to the 243s. But real ls6 heads have the sodium filled valves guess that means a lighter valve train.

**jjc239** · 09-13-2010, 02:27 PM

cool, i posted this on my other post but no one seemed to car, what do you think about 1.85 rockers? i hear they can add up to 10 hp?

**derbs** · 09-13-2010, 03:42 PM

If you wanna spend the cash go for it. stock is 1.7 plenty for damn near any aftermarket cam unless your going for something huge.

**c5z28** · 09-13-2010, 03:48 PM

They use stock rockers on strokers. In other words spend the money elsewhere. Stock 243 are worth about 15rwhp more in stock form.

**9T8W66** · 09-13-2010, 06:10 PM

Originally Posted by derbs

The ls6(243) are 2.00/1.57 intake and exhaust and if I'm right their 64cc chambers??? vs. the ls1(241) are 1.97?/1.50? intake and exhaust(I'm going to get murdered here for the specs) and with 67cc chambers?? you can gain up to 40hp with just changing the heads to the 243s. But real ls6 heads have the sodium filled valves guess that means a lighter valve train.

Valve sizes are the same for both heads (2.00 1.57) except the LS6's are longer and are lighter (sodium filled) Chambers are as you stated 64cc (LS6) 67cc (LS1) Intake ports are 200 cc for LS1 210 for LS6. The LS6 head is basically a tuned up version of the LS1 head and worth about 20 HP on a stock setup.