kingof951

iTrader: (1)

can u put stock springs after porting 243 heads for installing them on an ls1 with a stock cam. its a 2000 ss so little bigger cam than the 01-02 btw. thanks in advance for any help

2000PewterT/A

Yes, as long as the spring seats are the same size as stock.

kingof951

iTrader: (1)

Thanks. What all do I have to change out on the heads for a port job or can everything remain stock parts... like rockers push rods etc? Thanks

Burken01

iTrader: (88)

You purchased 243 heads already ported? or you had them ported?

you can reuse rockers, you'll need to measure for proper pushrod length since these heads are a diffrent CC than what orginally came on your car I'm assuming.

what kind of budget are you looking at?

garygnu

consider installing a ASA cam,it works with stock GM yellow springs.consider harden push rods.how many miles on the short block?check Texas Speed for a ls2 timing chain and gaskets.

kingof951

iTrader: (1)

Yep. Got some already ported 243s bare. Its a budget build so looking at stock parts for cheap. Want to keep the stock springs BC I want the heads low maintenance (spring change interval) which is why I don't really wanna cam it either and not looking to rev over stock redline. Also I live in Cali and want to b smog legal... very important. Was considering an ls6 cam but heard the 2000 fbody cams are almost as good and its not worth it. My car has the 853 crappy heads on it now). Only thing I was thinking of upgrading was pushrods.

Also odo says 150k but I'm assuming engine was recently rebuilt due to condition and vacuum test. Doesn't burn any oil either and oil takes a long time to break down for oil change interval. I had a 50k 01 z28 2 years ago and this car feels stronger but it might be cuz my new ss is a m6 and z28 was an a4. But I'm just assuming I really don't know **** lol. Just experience with cars.

Burken01

iTrader: (88)

What condition are those heads in you got? low miles after the port job? how does the surface condition look like on them?

"cheap" doesnt belong in your build, budget however is ok as long as you don't skimp out on necessary parts.

So all your upgrading is from 853 heads to 243 ported? nothing else?

kingof951

iTrader: (1)

oh my fault "budget" lol. the heads have like 15k miles on em so im gonna have em resurfaced. maybe milled? what u guys think? bump up compression a little. and im also gonna put on an slp ls6 with egr intake with ls6 coolant lines and ls6 pcv valley cover i think theyre called as to get rid of the oil catch can. gonna cam it later when its not my dd. i figure with heads ill keep up the mpg while still on a budget. will i NEED a tune when swapping the heads and intake? i know a tune will maximize the mods but again im on a budget. i still wanna be able to spank some ricers and take it to wot without f'ing it up. can i do this without a tune?

Burken01

iTrader: (88)

I would advise to get a tune to get the maximum benefit of the mods that you've done.

yes you can mill your heads down a bit to bump up compression, use this link to help you pick the CR you want.

https://ls1tech.com/forums/advanced-...ume-vs-cr.html

since your keeping everything stock on your engine that list above should be accurate for you. but you can still double check Cr when you go to get your heads surfaced, just tell them your combo and what your aiming for..

the ls6 valley cover requires grinding a tab off inside the valley of your block with a dremel, just make sure you tape everything off really good so you dont get debris inside your engine..

kingof951

iTrader: (1)

Ill make sure to do that. What's a good CR for my setup that ill have with the 243s? And if I plan on a modest cam in the future... maybe a hot cam or something. Something that won't tear up the springs. Also what kind of gains should I expect from the heads and intake without a tune? Btw thanks for the patience.

kingof951

iTrader: (1)

Will an asa pass smog with my plans? Or should I get a custom grind? Looking for something that won't tear up springs and keep good street MPG if that's even possible. 02+ zo6 cam?

Burken01

iTrader: (88)

Well theres alot of good vendors that can custom spec you a cam to make good power and still have really good street manners, And if your worried about durability you can get a good dual spring kit with steel retainers that are much stronger than stock springs...

your not going to want to do those mods without getting a tune, it will just dissapoint you. I know you said budget but if your going through the trouble of taking the heads off, you might want to look into getting a cam as well and springs..

11:1 is a good NA CR, I wouldnt worry too much about that at this point in the game.

Burken01

iTrader: (88)

if they are original springs, get rid of them, spend a little extra and get some springs that you can beat on and not have to worry.

smog is diffrent for everybody, some people can pass with longtube headers and no cats i've seen? so I couldnt tell you.

I would hold off on putting your heads on until you can do a full Head/cam/spring kit with supporting mods such as a ls2 timing chain, ls6 oil pump, ls7 lifters, ls2 lifter trays, and a good tune...

it will cost a bit more but you will save money in the long run and will net you the power you are looking for...

goodluck

kingof951

iTrader: (1)

ok thanks for the info. i guess ill just keep piecing together until i can do the full swap. yea im mostly worried about gettin sent to the state ref. a buddy of mine got sent there for his LTs. i had a cop look under my car for LTs and had me pop the hood... 5-0s around here are starting to get smart. u know any good tuners (regular and dyno) around the inland empire or oc area? also a good machine shop. have a friend looking to port his 241s pretty soon. thanks again.

Burken01

iTrader: (88)

Thats why you need the sleeper look lol

no bling wheels or stuff like that...

pm me and ill send you a few references to places

kingof951

iTrader: (1)

pm'd thanks

sreve

iTrader: (3)

Quote: Was considering an ls6 cam but heard the 2000 fbody cams are almost as good and its not worth it.


Stock 98-00:
Duration@.050 198.86 intake 209.25 exhaust
Lift .498 intake .497 exhausts
LSA 119.45



PN# 12560950 2001 LS6 Cam

I:207

E:217

I:525

E:525 116 LSA Cam requires valve spring P/N 12586484

anheuserbusch08

iTrader: (11)

ls6 cam is way better than the 2000 ls1 cam 204/218 551 547 117.5 lsa run that with ls6 springs and 243s milled .030

kingof951

iTrader: (1)

ok thanks... yea i might as well throw a ls6 cam in there while i got it apart. guess i heard wrong about the difference. are those cam specs on the 02+ ls6?

Burken01

iTrader: (88)

If you want the ls6 cam, get the 02-04 version... They go used on here around $120-$150 depending on whos selling it.