s10-den

What is the difference in the 241 and the 243 heads?Both are suppose to be ls6 heads(they both have the triangle tool mark) I have a chance to buy either set and just need to know which ones are better for the money?

NemeSS

iTrader: (127)

243 is better, flow more have diff.,bigger intake port, diff. chamber
go with the 243

bjamick

iTrader: (31)

243's give prob 20rwhp stock over the 241s . Get the 243.

03Sssnake

iTrader: (20)

241 was never used on the LS6, just an updated LS1 head. The 243s were used on the Ls6 mill and will outflow the 241 heads.

jimmyblue

iTrader: (11)

243s also are found on the LS2 motors, different
valves / springs but same casting. So availability
has improved a lot.

deadmanTA

iTrader: (7)

Nothing special about the 241's, they just have smoother ports than the 853 heads. I just gave a set of 241's away because I couldn't sell them and get enough to cover shipping cost out of them.

s10-den

Thanks fellas !

"""243s also are found on the LS2 motors, different valves / springs but same casting. So availabilityhas improved a lot"""

-------- Matter of fact, they came off a ls2. Would there be any issues using them on a cammed 'ls1'? Im gathering part for the ls1 swap, figure i could do it cheaper putting parts together.Thanks again

Summerwolf

iTrader: (3)

I have LS2 243's on a cammed LS1...worked perfect.

I had them rebuilt and lots of portwork done before installation but same difference more power.

bjamick

iTrader: (31)

799 castings are also the same as 243 just so ya know

s10-den

Thanks, I didnt know that.

deadhorse66

iTrader: (2)

Yep. I have a set on my pickup, and they gave it a MAJOR shot in the arm. That's the chamber in my sigline after I polished it.

wht01ws6ta

iTrader: (45)

GM started putting 243s on more engines lately, I've seen them on a stock 4.8L truck engine. Not sure if that is the exact same valves/springs as the 243s on the LS2 but I wouldn't doubt it.

Like stated above, the 241s never went on the LS6 and 243s always flow better.

02BLKWS6MD

iTrader: (22)

yeah they're on 4.8,5.3 and I think 6.0 trucks. They even use them on the 5.3 Impala SS and Monte Carlo SS.

wht01ws6ta

iTrader: (45)

I knew it was quite a few of them so, yeah, they are definitely out there. 6.0 trucks should be 317 heads unless its an older model.

deadhorse66

iTrader: (2)

The 6.0 gets the rectangle port head these days.

s10-den

Guess I should ask are all the 243's the same cc's?

02BLKWS6MD

iTrader: (22)

Yeah I was thinking they were the motor with the different heads. Just wasnt to sure on that. I see that the 317 heads are being used on alot of setups now, is there any reasoning behind this? I've seen a few FI cars with them, do they work better with FI since they have more CCs?