jthunderz28

My car is an 02 WS6, m6 car, with GMMG exhaust and a lid.

My goal is to have a reliable 370 rwhp/torque car on STOCK MANIFOLDS. Retaining at least 26 mpg highway and 17 mpg city.

I drive my car about 15-17k miles a year, so when I say DAILY driver I mean it. Not you're down the street commuter here.

Would it be worth it to swap the heads out if planning for an EPS cam or Cheatr cam?????
How would the heads affect the reliability of daily driving???

Is it possible to get 370 rwhp on manifolds? or am I dreaming.

Thoughts/advice please...

MYSTIC-1SC

iTrader: (14)

Whats the reason for wanting to stick with stock manifolds? Also the heads definetly would help out and I see no reason why it would affect reliabilty negatively.

MYSTIC-1SC

iTrader: (14)

I just noticed your from California. Thats probably your reason for wanting to stick with the stock manifolds. LOL.

jthunderz28

BINGO!!! CA sucks when it comes to having a law/rule for every damn thing.

How would the heads affect gas mileage? Lets say if I went with some ported LS6 heads.

I've been scoping the ones from TSP, the PRC stage 1's. Looks like a good price.

But the budget to do everything is$2500 including labor and tune. Currently my car has 95k miles on the stock valvetrain.

Anyone else care to chime in?

KONG

iTrader: (4)

Honestly 241 castings are good heads untouched. But if you want to try some different and stealthy, check out this thread.

https://ls1tech.com/forums/dynamomet...22-7-rwhp.html

MYSTIC-1SC

iTrader: (14)

Texas Speed can definelty get you headed in the right direction, and as far as gas mileage goes, I wouldnt be suprised to see numbers go up a bit if you kept your foot out of it with a mild setup.

jthunderz28

Thanks for all the feedback.

I think I'm gonna call Texas Speed tomorrow and Geoff over at EPS and get some answers as to the best route to take budget wise and matching up components that are the most effective....etc etc.

orangeapeel

iTrader: (18)

If you can get your hands on an MTI cam these days, use them to gently place it up for sale. Grinds have come a long way since their design. It was proven back when things were still ramping up early on. 2003.

Talking with Geoff would be the route I would take.

KONG

iTrader: (4)

Comp can do a variation of the grind or exactly the same one. The thread was just to merely give him ideas about a combo with a stock idle and could probably pass emissions w/ cats of course.

orangeapeel

iTrader: (18)

I knew what you were getting at. Some people have success with the reverse splits, but they are still about as common to see as they were back then. They would most likely be the more emissions state friendly choice if I had to guess.

thunderstruck507

iTrader: (18)

A reverse split on a car with manifolds would likely be one of the worst things a person could do.

Even with 3" true duals, my car still picks up with the cutouts open.

KONG

iTrader: (4)

I know in the original post he stated manifolds but there are 50 state legal headers he could go with and they have all the emissions fittings needed to make his car California Legal. They even come with a CARB sticker to place under the hood. That is the only reason why I gave a reverse split as a suggestion. I should have made my post more clearer. Sorry guys.

jthunderz28

I have an 02 LS1 and after some research it seems as if they had the best manifolds out of all the years of the F Bodies.

I doubt it would be worth it to do shorty headers to see significant gains over the manifolds. Most people seem to dismiss the idea of doing shorties period after the posts I read through.

I'm pretty sure LT headers are illegal in CA, otherwise I would have done it already.

What is reverse split btw???

KONG

iTrader: (4)

A reverse split cam is a grind with more Intake lobe duration than Exhaust lobe duration i.e. 230/224 or the MTI cam I suggested above 224/220. They work well with a full exhaust system.

uLs1a

iTrader: (22)

I just put in an EPS 222/226 .596/.598 114 cam and went from the stock 806 heads to LS2 243 heads. I am also sticking with the stock exhaust manifolds (stupid Cali laws) with the SLP LM1 catback. I should get my car back this week tuned and dyno'd so I will post my numbers and let you know.

uLs1a

iTrader: (22)

LT headers are illegal in California because you are either removing the catalytic converter or changing its position. IF they are 50 state legal, my guess is they are shorty headrers, and with the price of those you can get a nice set of LTs.

BOBS99SS

iTrader: (2)

Honest if I lived in cali I would just slap on a pro charger and be done,I wish I would have gone that route right from the start,

BOBS99SS

iTrader: (2)

Last year they did a head and cam combo that was smog legal for CA in GMHTP try and search for that,

jthunderz28

'

Is there any way you can get a video up of how your car sounds with the stock manifolds at both idle and revving.

I cannot find any videos online with cammed ls1's going through stock manifolds. They all have headers.

Thanks buddy that would be appreciated, and thanks again to all for dropping their 2 cents.

408Maro

iTrader: (14)

Very interested to see the results