daniel28391

Okay I purchased the FAST lsxr 102mm intake, throttle body, and fuel rail kit. Melling 296 Oil Pump, c5r Timing chain, SLP intake box, Headers and y pipe, SLP Loudmouth Exhaust, and QTP electric cut-out for my 2000 ls1 Ws6.. I know I am going to get a Cam, probably upper mild level, but my main concern is I believe my 2000 T/A has 241 heads and I should probably upgrade to the 243 heads?what would you predict my power difference would be 241 vs 243? Do they remove heads to get to oil pump or no? Labor wise how much more would it cost to have heads installed when im already having them do the oil pump, cam, and timing chain? Sorry if my post rambles, its my first soooo

Burken01

iTrader: (88)

You don't have to remove the heads to do the oil pump.

A 2000 ws6 has 853 heads, not 241's. Very similar heads though.

Upgrading to 243 is a good upgrade as well as getting an aftermarket head, just depends on budget!

Probably an extra 200-300 to add a head swap into the mix, you'll also want to upgrade the lifters, valve springs, pushrods, new head gaskets, etc.. All "supporting" mods

daniel28391

okay thanks for the reply guys, and for letting me know heads are 853 and not 241 .. guess im going with fully ported and polished 243's

HCI2000SS

iTrader: (2)

Do you have a budget in mind?

LivernoisMotorsports

iTrader: (1)

Hello, Daniel.
It's a good idea to do the heads and camshaft at the same time to ensure they are a matched package.
When you do a camshaft install you can attack the valve spring upgrade on the car depending on who is doing the work.
It would be best to do a matched head camshaft combo and ensure everything is going to talk to each other.
The castings are not going to make a big difference once properly ported.
Typically is only a little more labor to remove the headers/heads vs doing the spring swap.
Another advantage to upgrading the heads is you will get a fresh set of head gaskets and some high end head fasteners.

JRENIGAR

iTrader: (37)

Not true. My 2000 T/A had 241's stock. The 98-99 ls1's got the 853's. 2000 and up got 241's

red_00z28

iTrader: (14)

The switch from 853s to 241s came in late '00.

JRENIGAR

iTrader: (37)

Ah ok, oddly enough, both my 99's had the 853's and both my 2000's had the 241's.

scotty2000ss

iTrader: (2)

Correct. I have 241s on my 00 SS.

JRENIGAR

iTrader: (37)

Is there a documented build date cutoff when the swap from the 853's to the 241's happened? Id like to read about it if so.

Burken01

iTrader: (88)

not sure, either way they are the same casting. 853 are sand castings vs die 241's

Nothing else really separates them performance wise

98's had 806 perimeter heads.

All very similar heads

daniel28391

I got a set of fully ported and polished ls6 243 heads off of eBay for $1100 with beehive .650 springs installed. My car is just about finished at the shop and I will update you all with some numbers. And BTW my heads were in fact 853 heads not 241's. I also am doing MSD wiring set, ls7 lifters, ls9 head gaskets. My next question is what rear end should I get to go with this set up because I'm thinking my stock 10 bolt will not hold the power I will be making.. Thinking Strange 12 bolt, but I see some c5 Z06 rear ends on eBay for half the price. Would the C5 z06 rear ended fit in my WS6 and if so is it better? Thanks

Burken01

iTrader: (88)

Vettes have independent rear suspension, will not work in a fbody..

daniel28391

Okay thanks for the quick reply! Would you recommend the Dana 60, 12 bolt, or the 9". Which would be the best (for the money) ?

Burken01

iTrader: (88)

Manual or auto?

daniel28391

A4 auto with stall

Burken01

iTrader: (88)

Honestly the ten bolt will last with the power you'll be making, unless you go to the track on slicks twice a week you should be ok for now. And even then a 10 bolt will hold 400hp..

You'll likely be making 360-380 with a cam swap by itself

But if you have the budget to go aftermarket rear and plan to make 500+ and launch a lot on a sticky tire then I would recommend a 9"

I've used moser 9's in the past, strange also makes a good rear end

daniel28391

After the ported polished 243 heads, cam, headers, Fast 102 intake and TB, and ect. I'm expecting around 450 hp but will probably be running c6 wheels and tires (not drag radials ) and also will only be doing street driving with very minimal aggressive driving. Just didn't wanna be that guy who goes to fry one of those ricers and end up tanking my rear end in the process. Lol but if the ten bolt will be good for that then I'll save the money!

BoricuaHec01

You need some AFRs if you want to hit your goal.

daniel28391

Yes I've Heard the AFR Heads are better, but I was unaware of that when I purchased my Fully Rebuilt & ported and Polished 243's off Ebay. From what i've seen on here I'm thinking my numbers will at least be close to 450 after my big cam, (bigger than I was originally gonna run), 102 setup, 36lb injectors,tune, headers, and a few other things.