FNFAST

I have an 02 A4. Anyone know the specs of the stock camshaft? :confused:

Mitch C

The stock 02 cam specs are 198/208 500/500 lsa 115.5

FNFAST

Thanks Mitch, much appreciated. :thumbs:

YO-EL

Mitch. Do you know what it is for the 00 A4 ??

V8_Club

The following is from LS1 / LS6 Performance / Written By Chris Endres

2000 LS1 Y-Car 198/209 .500/.500 LSA 115.5 A
2002 LS1 Y-Car 196/207 .467/.479 LSA 116 ( 2001 - 2003 Same Cam )

:steering:

Mitch C

The cam specs are:

97-00 202/210 472/479 117 LSA
01-04 198/208 500/500 115.5

LS6
01 204/211 525/525 116
02-04 204/218 551/547 117.5

MC TORCH RED

mitch i think gm went 500 lift in 2000 model.... :confused:

V8_Club

I am sure the cam size changed in '00.

Mitch, no disrespect but did you get the numbers from a book/site etc. The reason I ask is that as you can see from my earlier post I referred to Chris Endres's book. I have taken a lot of tips from this book & would like to asses to accuracy of the info provided. :blueangel:

Mitch C

I could be wrong but I don't think so, GM changed the cam, intake manifold, and MAF on the 2001s. That is why the 97-00 are rated 345 HP and the 01-04 are rated 350 HP. I did a search in the forum archives and these are the specs that I came up with.

C5BTW

My understanding is that the cam specs for LS1 engines are as follows:

1997-2000 C5 LS1:
- Intake / Exhaust Duration @ .050": 202 / 210 Degrees
- Intake / Exhaust Lift: .472" / .479"
- LSA: 117 Degrees

2001-2004 C5 LS1:
- Intake / Exhaust Duration @ .050": 199 / 210 Degrees
- Intake / Exhaust Lift: .467" / .479"
- LSA: 116 Degrees

1998-2002 Camaro / Firebird LS1:
- Intake / Exhaust Duration @ .050": 198 / 208 Degrees
- Intake / Exhaust Lift: .500" / .500"
- LSA: 115.5 Degrees

There has been only one cam change in the C5 LS1 - in 2001 - when a number of other changes were made in the C5 LS1 motor. The other changes include:
- an air inlet in the front of the air cleaner cover
- a larger MAF (from a 74 mm to 85 mm)
- a larger intake (LS-6) manifold
- a switch from stainless steel 4 into 1 headers to cast iron tri-y headers
- the addition of two "pup" cat convertors (four cat convertors in total compared to 2 in the 1997-2000).

My understanding is that no further changes were made to the 2002-2004 C5 LS1 engines.

FNFAST

Wow! When I asked this question I never thought I'd get this much detailed info. Thanks a bunch guys. :cheers:

vettman10

There was a cam change in 2000, as well as several other minor internal changes including piston top and combustion chanber design. These changes were not well publisized. I believe that V8_club has the right cam numbers in his post.

C5XTASY

I asked this same question earlier today. Mitch@Tigershark shot me the following info:

With regards to Corvettes...

Year, Engine | Valve Lift | Duration | Lobe Separation | Timing
1997-1999 LS1 | .479/.472 | 207/199 | 117 | 113/121
2000 LS1 | .500/.500 | 209/198 | 115.5 | 112/119
2001-2003 LS1 | .479/.467 | 207/196 | 116 | 117/115
2001 LS6 | .525/.525 | 211/204 | 116 | 114/118
2002-2003 LS6 | .551/.555 | 218/204 | 117.5 | 115/120

I believe this is the correct info. It sure explains why those 2000 C5s are so damn fast! :D
Ed

V8_Club

Thanks Vettman10 :thumbs:

C5BTW

This is not a "flame". As time goes by, well intended but incorrect data creeps into the Corvette the hobby.

That said, I acknowledge that some of the cam data I cited in a prior post could be wrong, but I still believe it to be correct.

My understanding is that 1998-2002 F-Bodies (Camaros and Firebirds) LS1 engines were equipped with a cam with the following specs:
- Intake / Exhaust Duration: 198 / 208 degrees @ .050 Llift
- Intake / Exhaust Lift: .500" / .500"
- LSA: 115.5

Some of you also cite a cam with identical specs as being the cam that was installed in 2000 C5 LS1's.

The F-Body LS1 cam required an an externally visible EGR valve, which all F-Bodies have. 2000 C5's do not have an externally visible EGR valve, which would likely have been required if a cam with specs identical to the F-Body cam had been installed in the 2000 C5 LS1 engines.

Regarding Mitch@ TigerShot's data, multiple sources indicate that the cam duration specs on the 1997-2000 C5 LS1 are 202 degrees intake / 210 degrees exhaust @ .050 lift. Also multiple sources indicate that the cam lift specs for a 2002-2004 LS6 are .551" intake / .547 exhaust.

Perhaps someone should send an inquiry to Corvette Quarterly to clear the air on the C5 LS1 cam specs issue.



[Modified by C5BTW, 6:10 AM 11/6/2003]

C5XTASY

I checked with Mitch. This data also came from the Chevy LS1/LS6 Performance book by Christopher P. Endres.
Ed

V8_Club

Thanks to Chris Endres for this wonderful book. :thumbs: I have learnt a lot from it. If any of you guys haven't read it yet , I recommend you do. Trust me it is reallly a good book for both novices & pros alike. :flag :steering: