LS1's from 99-00

[LS1 TA]

Does anyone know of any differences between the LS1's of 99 and those of 2000 and up? My car is a 1999 ta made in april of 99 but I am finding out that the engine may be newer due to a water pump issue I had. I am just trying to figure out exacty what year LS1 is in my car for when I go to purchase other replacement parts.

[Joe 1320]

A major difference is that the early versions had thinner cylinder liners that prevent more than a .020 overbore.

[LS1 TA]

Learned something new today. Probably learn alot more about my LS1 on here as there seems to be alot of knowledgeable people on this site. Are there any external differences to look for other than the water pump?

[Christopherrr]

I haven't seen new LS1s...there are two Z28's at my dealership and I took a look at both in comparison to mine...one is 98 and the other is 99. No difference from mine...well, there are . There is a 2001 WS6 that a guy works in service drives...I'll take a look and see if there are any major differences.

I know newer LS1s lost the EGR also...

[Christopherrr]

I found this...google homie...it can't cure cancer, but it does about everything else.

1998 F-Body

1. Had different casting heads which had perimeter bolts and valve covers.
2. Ignition coils were mounted to the valve covers one at a time.
3. The water temp gauge actually works.
4. 98's do have an oil life monitor, they just don't tell you anything when its time for a change. You can find it in Auto-Tap
5. WS6s had single outlet exhaust (all others had duals)
6. Steering wheel controls were completely different part with indentations on the buttons, and were better built
7. Only year that Purple, Gold, and Green were available
8. Some very early Trans Ams came with LT1 style headrests
9. Rear hatch release was poorly designed and often caused problems releasing mechanism
10. Early model 98 Monsoon stereos didn't have capability to control 12-disc CD changer
11. 1998-1999 automatic transmission LS1s could be started in 1st gear even with the shifter in 2nd. Starting 2000, if you put the shifter in 2, it would start off in 2, even from a stop.
12. 1998-1999 LS1 cars had a smaller throttle body cam, which caused the throttle to open to WOT (wide open throttle) faster than 2000+ cars
13. 1998 cars had 28 lb fuel injectors from the factory
14. 1998-2000 cars had a larger cam than the 01-02 cars
15. 1998-1999 cars had more restrictive exhaust manifolds
16. 1998-2000 cars had an LS1 intake with EGR
17. 1998 and some early 1999 cars had blue outside rear view mirrors (Trans Am only)
18. 1998 only LS1 blocks had a much smaller cylinder sleeve that only tolerated a .005" hone
19. Last year F-body to use the old 15.5 gallon steel fuel tank.
20. Only year LS1 F-body to contain a gas cap with a tether long enough to actually hang from the fuel door while open
21. Only year LS1 F-body to not contain the famous GM black box used in the event of an accident to record up to 5 seconds of pre-crash data
22. 1998 only cars had a different PCV system with the PCV valve located above the passenger side valve cover
23. 1998 most cars did not have an idle adjustment screw on the throttle body. Some 98 cars do have the idle throttle stop set screws.
24. 1998 cars have a completely different PCM from 99+ cars
25. A production shortage of F-body cams caused the use of a C5 cam to be installed in F-body LS1s for a very short time
26. 97-98 LS1's used a paper water pump gasket. The only gasket that isn't reuseable
27. SSs did not ALL go to SLP starting in 98. Y2Y was the RPO code that sent them to SLP for additional options
28. SS option did not "include" the Synthetic oil package, it was a SLP only Option




1999 F-Body

1. 1999-2000 cars switched to 26 lb fuel injectors
2. Cylinder heads and valve covers redesigned to have center bolts instead of perimeter bolts. Other than that, the heads were the same.
3. Redesigned cylinder sleeves that allowed for a small bore, up from .005" in 1998 models.
4. Midyear model change to a cheaper steering wheel audio control button without finger indentations, and cheaper built
5. 1999 cars continued the LS1 intake with EGR provisions
6. 1999 cars continued more restrictive exhaust manifolds and larger cam
7. Only year that Hugger Orange was available (Camaro only)
8. 30th Anniversary Trans Am available with special blue and white paint package and blue clear coated WS6 wheels
9. Switch to larger 16.8 gallon plastic fuel tank to meet new emissions requirements.
10. Gascap tether was shorter and could no longer be used to hang on the gas door when open.
11. Company wide change added black boxes to record up to 5 seconds of data before a crash
12. Rear hatch release was redesigned with stiffer spring that released the hatch better
13. Water temp gauge was redesigned to work basically as a dummy gauge and only show an overheat condition.
14. An oil life monitor was added to all LS1s, thus changing the gauge cluster a little to show the oil life reset swtich
15. 1999-02 cars had a different PCV system with the valve located to the side of the intake manifold
16. Early production 1999 Trans Ams still had the blue outside mirrors, but a midyear change went to the non-tinted ones
17. 1999 there was the color "Medium Blue Metallic" which was available on both the Camaros and Firebirds. Only one year of that color



2000 F-Body

1. Redesigned exhaust manifolds for new emissions standard actually flowed better and created a little more HP.
2. 2000 continued use of LS1 Intake, EGR, smaller cam, and 26 lb fuel injectors
3. Added rear child seat safety hooks to interior per federal requirements
4. Very early run of WS6s had "salad shooter" style rims. A production change switched back to standard 5-spoke WS6 rims.
5. Camaros got redesigned 10-spoke base rims, and SSs came with new 10-spoke rim design
6. First year of Monterey Maple Metallic paint
7. Charcoal (grayish) interior was replaced with Ebony (almost black) leather interior
8. Cloth interior cars got new rainbow colored cloth patterns
9. Camaros only got the Pontiac steering wheel with optional audio controls
10. Throttle body cam was increased in size to slow the speed at which the car reaches WOT
11. Automatic transmission cars were reprogrammed to allow a car to start off in 2nd gear from a stop when the shift lever is put into 2.
12. The last year a WS6 Formula was offered
13. Starting 2000 intake lids contained a seperate breather filter
14. 2000+ Camaros came with body colored mirrors instead of black ones like 98-99



2001 F-Body

1. A small percentage of 2001 and 2002 LS1s actually had LS6 blocks which had a different part number and a darker metal cast
2. Starting 2001, all LS1s came with an LS6 intake manifold without an EGR system
3. Advertised HP output was changed from 305 to 310 on base LS1s and from 320 to 325 on WS6s and SSs
4. 2001-02 cars have a smaller cam from the Vortec truck engines to increase low end torque
5. 2001-02 cars had 28 lb fuel injectors like the 98 cars (albeit different part numbers)
6. WS6 cars had a redesigned 5 spoke rim which was more wavy
7. WS6 cars got less suspension upgrades from a base Trans Am suspension than previous years
8. Manual transmission cars all came with the Z06 clutch




2002 F-Body
1. 35th Annivesary edition of the Camaro, and Collectors Edition Trans Am available
2. 2002 LS1 head gaskets redesigned. The new ones are a pressed metal, as opposed to the graphite ones and are no longer specific to the side of the car theyre installed on
3. 2002 cars continued with the LS6 intake, 28 lb fuel inectors and smaller truck cam
4. 2002 continued the use of an LS6 block in some LS1 F-bodies
5. A factory supported optional 345 HP option could be ordered from SLP
6. Manual transmission cars continued use of the Z06 clutch
7. Some 2002 model F-bodies came with a revised rear view mirror that had the map light buttons on the bottom, rather than the front.

[LS1 TA]

Thanks man that is a pretty helpful piece of writting right there. I will go scope out my engine as soon as the sun comes up. I love my job . Still didn't read anything about a different water pump though. I believe you said yours had a removable pulley and mine is pressed on. Oh well, I'll stop worrying about it, a pulley is a pulley I guess.

[moartork]

1998

14. 1998-2000 cars had a larger cam than the 01-02 cars

1999

6. 1999 cars continued more restrictive exhaust manifolds and larger cam

2000

2. 2000 continued use of LS1 Intake, EGR, smaller cam, and 26 lb fuel injectors

Cam info conflict? "1998-2000 had a larger cam" "2000 continued ... smaller cam".
.

[xxRillixx]

cool stuff, thanks!

[moartork]

Don't get me wrong, Chris, as a noob (or FNG, if you wish), I appreciate your posting all that info.

1998 F-Body

11. 1998-1999 automatic transmission LS1s could be started in 1st gear even with the shifter in 2nd. Starting 2000, if you put the shifter in 2, it would start off in 2, even from a stop.

I wonder if the 2000-2002 BC4 cars also suffered from the 2nd instead of 1st gear selection issue.

[redws6]

17. 1998 and some early 1999 cars had blue outside rear view mirrors (Trans Am only)


ive noticed that my 1996 has them too.. was that a factory option? or maybe just the way the glass was made.

[Jeff_in_Atl]

Don't get me wrong, Chris, as a noob (or FNG, if you wish), I appreciate your posting all that info.



I wonder if the 2000-2002 BC4 cars also suffered from the 2nd instead of 1st gear selection issue.

That's not a suffering or a problem. It's an added bonus. Ford has done that since like the sixties. It' helps in really bad road condition like snow.

[Dave M]

That's not a suffering or a problem. It's an added bonus. Ford has done that since like the sixties. It' helps in really bad road condition like snow.

yes, I wish my car had a second gear start. would definately make things easier in slippery conditions. I've often wondered why that isn't a feature on more cars.

[Wild Willy]

17. 1998 and some early 1999 cars had blue outside rear view mirrors (Trans Am only)


ive noticed that my 1996 has them too.. was that a factory option? or maybe just the way the glass was made.

The copy of the parts manual I have says '93-'98, RPO DG7, tineted glass (first design)- I have seen them on Firebirds and thought they looked pretty good, sort of Euro- like a BMW or Mercedes- I have wondered if the glass from them would fit my Camaro, the housings are obviously very different-