LS1/LS6 Intake Manifold

[babamerino]

Okay so Iʻm slowly trying to get my build together... I bought 241 heads from a corvette and gonna have them ported and polished and slap those on with a 214/224 115 lsa Compcam... Now Iʻm wondering if I can replace the stock intake manifold and replace it with and LS1 or LS6 intake manifold while also keeping the Airaid Jr... Thoughts??? Thanks in advance!!!

 

[livingez_123]

I seen your heads in your post. Those look like early cathedral port heads. the newer heads have a rectangle port. I'm not 100% sure, but I don't think you can use your current intake with the early heads. If you go with the LS1 or LS6, your going to lose bottom end Tq, The truck manifold has longer runners for a better low end. I would go with the Fast LSXRT manifold.... http://www.fuelairspark.com/fas/lsxrttm-102mm-truck-intake-manifold-cathedral-port-headshtml/

It will give you room to grow if you want to do more to your truck later.

 

[babamerino]

I seen your heads in your post. Those look like early cathedral port heads. the newer heads have a rectangle port. I'm not 100% sure, but I don't think you can use your current intake with the early heads. If you go with the LS1 or LS6, your going to lose bottom end Tq, The truck manifold has longer runners for a better low end. I would go with the Fast LSXRT manifold.... http://www.fuelairspark.com/fas/lsxrttm-102mm-truck-intake-manifold-cathedral-port-headshtml/

It will give you room to grow if you want to do more to your truck later.

Okay... I know that my stock 243ʻs have cathedral ports... But the Fast LSXRT is out of my price range so I have to stay with my stock intake I guess... But definitely donʻt want to lose bottom end because thatʻs the reason Iʻm doing all these upgrades LOL!!! Thanks!!!

 

[josueh95]

although they look ALOT cooler the ls1/ls6 or any car intake will loose you lower end torque as stated above. also it will interfere with your alternator bracket so some modification will need to be made..i agree that the lsxrt is out off manys price range but the intake you have now flows really well and is actually an upgrade to the nbs trucks..maybe porting it will help out

 

[babamerino]

although they look ALOT cooler the ls1/ls6 or any car intake will loose you lower end torque as stated above. also it will interfere with your alternator bracket so some modification will need to be made..i agree that the lsxrt is out off manys price range but the intake you have now flows really well and is actually an upgrade to the nbs trucks..maybe porting it will help out

Alright thanks!!! Gonna look into that!!!

 

[livingez_123]

Be very careful porting plastic intakes.

 

[JennaBear]

You should get an LS2 or TBSS manifold if you are dead set on getting one. Would not recommended swapping to this heads, stick with what you have if you are looking for low end.

The LS1/LS6 intake will hurt your low end as well.

Sent from a jelly bean.

 

[babamerino]

You should get an LS2 or TBSS manifold if you are dead set on getting one. Would not recommended swapping to this heads, stick with what you have if you are looking for low end.

The LS1/LS6 intake will hurt your low end as well.

Sent from a jelly bean.

Oh... So negative on these heads? Darn-it I already bought them... I went to LS1Tech and they said that it would work and my mechanic friend said that he can make them work where I will not lose that low end...

Just gonna port the TB...

So what do I do then about the heads?

Thanks Jenna

 

[livingez_123]

Sell them.

General Motors produced seven versions of the LS engine, most of them with different heads. You can identify which head you have by looking at the three-digit stamping next to the valve cover; for example, the LS1 used head castings 339 and 806 through 1998, and 853 and 241 from 1999 through 2004. The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used in C5 Corvettes. Later engines like the truck-spec LQ9 and LQ4 used the exact same port design as the LS6's 243 heads, but had 6 cc larger combustion chambers.

Basic Differences
There are three basic differences between the LS1 and LS6 heads. The first has to do with port shape. The LS6 and the later LQ9/LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. The second major difference is that the LS6 heads used hollow, sodium-filled valve stems for reduced valvetrain inertia and better heat transfer from the exhaust valves to the head. The LS6's 243 heads also had a slightly smaller combustion chamber: 65 cc to the LS1's 67 cc.

 

[babamerino]

Sell them.

General Motors produced seven versions of the LS engine, most of them with different heads. You can identify which head you have by looking at the three-digit stamping next to the valve cover; for example, the LS1 used head castings 339 and 806 through 1998, and 853 and 241 from 1999 through 2004. The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used in C5 Corvettes. Later engines like the truck-spec LQ9 and LQ4 used the exact same port design as the LS6's 243 heads, but had 6 cc larger combustion chambers.

Basic Differences
There are three basic differences between the LS1 and LS6 heads. The first has to do with port shape. The LS6 and the later LQ9/LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. The second major difference is that the LS6 heads used hollow, sodium-filled valve stems for reduced valvetrain inertia and better heat transfer from the exhaust valves to the head. The LS6's 243 heads also had a slightly smaller combustion chamber: 65 cc to the LS1's 67 cc.

Thanks for the info!!!