fccs

iTrader: (26)

Does anyone know if they came on any 1999 fbody's? I always thought theyre were some 241's but 243s didn't come out till 01 02?

406malibu

243's never came on ANY f-body's. Those are the ls6 heads. They only came on the Z06 vettes. (or anything else with the LS6)

the 241's came on mid 2000-2002 f-body's

the others were 853, or 806 (parameter bolt heads)

fccs

iTrader: (26)

Thought so..

BlueBird346

iTrader: (13)

They came on GTOs too..

406malibu

only the 05-06's. almost forgot that the 243 was also the ls2 heads.

WSsick

iTrader: (13)

just to clarify, not the 04 GTOs. no LS1 ever came with 243's

Parasoth

iTrader: (1)

I probably should just check the stickies but..

the others were 853, or 806 (parameter bolt heads)

So, if my valve covers are center bolts, but it's a 99, its got 241s?
Should have checked the damn casting number when I had the covers off yesterday.

Avaric3

iTrader: (3)

no i believe theyre 853s than. the 241s were on the last few years

fccs

iTrader: (26)

Alot of 98s I know came with 806's, then it was 853s, then it was 241's. Was just checking to be sure though.

araber89

iTrader: (3)

How much of a difference is there between the 853 and the 243 head? Like is it worth picking up a set to swap or are you better off just getting a better set to begin with?

99Zeeeeeeeeee28

iTrader: (9)

You should be able to see the casting number with everything on the engine and in the car...

Avaric3

iTrader: (3)

if you mean the diff between the ls1 head and the ls6 head than yes its worth the swap but if you meant 241 not 243 thanits not worth it

CJDZ24_Z28

iTrader: (75)

lol These heads were probably in the early testing back in 99

WSsick

iTrader: (13)

the 241 and 853 are almsot identical. you will see really good gains going from a stock 241 to a stock 243 (10-15). ported, you can see 25-35 depending on cam, compression and everything else. they are a wayyy better design.

406malibu

if its a 99 it came with 853's from the factory. Only 98's had 806's, and mid year 2000+ came with 241's. 99-my 00 had 853. If you look on the passenger side, toward the front of the head it will be stamped there.

Parasoth

iTrader: (1)

Yup, thanks guys found it, I feel like a dumbass now.

Always get that mixed up with the SBC/BBC.

853's.

406malibu

the power difference between the 853's and the 241's isnt nearly as much as people make it out to be. They are the EXACT same design, the only difference is they way they are cast. The 853 is sand cast, while the other is die cast. The better surface from the cast heads leads to a little power difference, but not much. if you port the 853's then they are just as good as ported 241's.

FST SS

I ordered my 2000 SS in FEB. 2000 and it was delivered in April 2000 and it has 241's.

406malibu

sounds about right... model year 2000 doesn't actually start jan 1 2000. it actually starts some time in 99 (around august, or september I think).