joesmith136

What are the difference between these two heads

which is better and by how much?

I have a 2000 Z28 with 853's on them now replacing head gasket and have both heads available to me

Reject

iTrader: (24)

I have 241 on my 00Z, i didnt replace them or anything they were on the car already. wonder if it related to produciton date or something?

Studytime

iTrader: (15)

There's maybe a 5hp difference if that. There were several reasons the cars that had 241 heads (2001 & 2002) made more power besides just the heads.

This has been debated many, many times recently. I know that I've personally chimed in five or so times in the last ~six weeks.

If you could swap out to the 241s or keep your 853s, install which ever set had the least amount of miles on them, or have someone port the 241s and then install them.

Ben T.

kevins2000LS1

iTrader: (11)

I was notice yesterday my 2000 Z28 has the 853 heads whats that mean??? is it normal???

Studytime

iTrader: (15)

That means that your car was actually assembled in mexico and it's a thousand wonders that it's still running. They didn't use rod or main bearings at that plant- everything was metal on metal. These are the cars that had the 853 casting heads, and a very small percentage of them are still running. I'd sell that car as soon as possible, like as in yesterday. It's a time bomb with those darned 853 castings

Use the search feature here, to answer your questions;

https://ls1tech.com/forums/search.php

I'm betting you didn't do that.

Ben T.

00formulaws6

is this really true

Reject

iTrader: (24)

dude, dont be a dick like that. just becuase you got owned by not knowing wtf a sticky was, dosnt mean you have to bash it out on others... if you wanted to have helped you could have posted some of those many many many links that were you talking about.

PREDATOR-Z

maybe they used substandard parts but there is no way no bearings were used.
BTW from my understanding all camaros were built in Canook Land

Studytime

iTrader: (15)

Mr. No sense of humor, I didn't get owned by not reading a sticky, I got RESPECT because I know how to be resourceful and read a sticky.

It was a joke guys, and also to my knowledge no cars were made in Mexico. There is hardly a difference in cylinder head flow between a 853/241 casting, so make your own conclusions on how they will affect power. Also, there were no years that used a substandard bearing, or for that much no bearings at all.

Ben T.

kevins2000LS1

iTrader: (11)

Damn it was just a question.

I seen someone talking about 241's and 853's fiqured id chime in while the topic was new

jimmypop13

iTrader: (17)

Hard Core Z28

i guess thoses 853 cars wont have to worry about a bearing going bad

mattraypharbor

iTrader: (2)

after market cam will flow better.

F-Killer

iTrader: (1)

My car is a 2000 camaro and was assembled in Canada, well I've got 853 since my car was one of the early cars, the later 2000, all of 2001 and 2002 have 241.

I've got a question, are the heads different from valve diameter? if I get 241's and 853's ported, will there be any difference?

PREDATOR-Z

Ported, very little difference. Stock they all have standard 2.00/1.55 (on LS1/LS6)

Studytime

iTrader: (15)

No, the person/company doing the port work is certainly WAY more important than what casting you're starting with.

Ben T.

King Nothing

iTrader: (9)

with which heads? cause my SS was made in late late 99 so i have the 853 heads

connexion2005

iTrader: (49)

Here is a quick breakdown on the heads guys:

97-98 Ls1's received the 806 Casting Heads
99-00 Ls1's received the 853 Casting Heads
01-02 Ls1's received the 241 Casting Heads

The flow rates among the heads is hardly worth the effort of swapping them for the "better" heads. It is stated that each set through the years flows better than the ones before. What makes the 01-02 cars stouter in most people's eyes is the fact that they have the Ls6 intake as standard equipment. It's not the heads it's the intake. Adding the Ls6 intake on Pre 01-02 cars has shown gains of atleast 7-10 rwhp in nearly every case it is installed. Also like stated above, go with the heads with the least mileage if both are unported. You will not notice the difference if they are the stock cut castings. If your a 98 car there is no point in swapping to the new heads for flow reasons because the later models use the center valve cover bolts compared to the perimeter bolts that the 97-98 cars use. In addition to that the coil packs also mount differently also and IMO it's not worth the trouble to swap up to the 99-02 heads unless they have been ported.

Josh

Ls1Gummi

iTrader: (2)

97-98 Ls1's received the 806 Casting Heads Thats a lie. I own a 99 ss and it has 241s on it. And i know for a fact these are the orignal heads that came on this car.

s346k

iTrader: (4)

both heads are horrible and you should get some double hump camel back heads instead. oh and a holley double pumper.