it had a pipe coming from behind the throttle body, im about to post pics i gotta put them on my Cardomain though i will have a link for you to see.

 

bottom of page has a pic of my engine i just took! im still uploading more. http://www.cardomain.com/ride/2972134

 

The 241s came on some LATE 2000 engines. I have a set as well on my 2000 engine. If your engine came installed with 241s then you also have upgraded rod bolts. Have a GM service person run your vin for your service history. I'm sure there are people on here that can do it. The difference between 853s and 241s are the casting methods. The 853s used a sand casting method which leaves the runners in the heads rougher where as the 241s used a different material which resulted in smoother ports. It's not a huge difference, maybe 5-10hp.

 

pitbull14218,

Just incase in the future if you are looking at ported heads. TEA does a stage 1
port job that flows nice numbers thru the whole rpm band, and they cost $995.00
they use the GM valves which proven to be very good. And the intake runners wont be
as large as a Patriot LS6 ported head meaning you'll make killer lower end torque and with the right cam the heads will pull as high as you need. Just wanted to help you anyway i can. I was thinking about selling my never used D1SC kit get get a set of heads like these and a cam that Predator-Z spec'd for me my setup would be nasty as hell Good luck with your setup.

 

Well my 00 WS6 has 241's and its build date is may of 00,Also my dad's formula has the same build date and has 241's on it also.

 

Thanks for all the help from everyone, I was just wondering, I dont have$$$ for too many things I still have my stock clutch and 10 bolt! I'm gonna do a cam before heads so I have to get my car ready for that still.

 

I hear ya...but you're welcome for the help. I'm currently in the same position
as you...and i love these days where the car is stock and i can take the car
in any direction..so good luck with your car.

 

stock for stock i don't believe there is a difference. after you port them...again, no difference. so basically i don't think there is a difference at all between the heads.

my 99 ta with junk 853 heads and junk manifolds ran ok at the track. same goes for the bolt-on 00 camaro i had with 853 heads..

 

what is the flow difference in 853, 241 and 243 heads? also is there a hp difference?
also i was wondering what is the number for ls6 intake manifold. thanks