2000 Cam Differences

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May 24, 2005 | 01:33 PM

Minkster

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Melting Slicks

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From: Columbia, SC

2000 Cam Differences

Does anyone know what, if any, difference in performance the 2000 cam has vs. the cam in the 2001-2004 LS1? The 2000 LS1 was down by 5 HP due to the pup cats, but GM said they got those 5 back plus more in '01 (350 hp) due to better flow (manifold and headers?). Anyone have any ideas?

May 24, 2005 | 02:18 PM

Jiver67

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From: Sacramento CA

I have wondered this myself as I have a 2000 hardtop as well. Looking at my Helms manual it shows valve lift as being .472/.479 but doesn't give any other cam specifications. However, I have heard from multiple sources that GM used a slightly larger cam on the 2000 cars (.500/.500 lift) to make up for the pup cats. My car came with a video that explained that the 2000 LEV cars with CA emissions are rated at 340 HP instead of 345...so yes, we are down 5 hp over the 2000 non-CA cars. Whether this is attributable to the camshaft, the pup cats (or both) I don't know.

May 24, 2005 | 02:28 PM

Dan_the_C5_Man

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From: Atlanta metro Ga.

It is true that GM used the higest-lift cam in the 2000 LS1's, larger than all before and all after.

I have the specs at home; let me know and I'll post them.

May 24, 2005 | 02:30 PM

Minkster

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Melting Slicks

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From: Columbia, SC

This was posted by C5XTASY:

This is true, and lower LSA:
1997-1999 LS1 / Y-car .472/.479 ** duration 199-207 ** LSA 117
2000 LS1 / Y-car .500/.500 ** duration 198-209 ** LSA 115.5
2001-2004 LS1 / Y-car ** .467/.479 ** duration 196-207 ** LSA 116
2001 LS6 / Y-car ** .525/.525 ** duration 204-211 ** LSA 116
2002-2004 / LS6 Y-car ** .551/.555 ** duration 204-217 ** LSA 117.5
Ed

Almost looks like a hotter cam in 2000, so was wondering if it was a significant difference or not.

May 24, 2005 | 02:54 PM

Jiver67

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From: Sacramento CA

Yes, I have seen these specs posted before. What bugs me is that the 2000 shop manual shows .472/.479 lift which makes me think I have the '97-'99 cam. One way to find out for sure would be to measure the valve lift using a dial indicator.

May 24, 2005 | 03:02 PM

C5XTASY

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From: Monticello MN

Quote:

Originally Posted by Minkster

May 24, 2005 | 04:41 PM

Minkster

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Melting Slicks

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From: Columbia, SC

Ok, how much of a power difference would the 2000 cam give for stock engines?

May 24, 2005 | 11:15 PM

Dan_the_C5_Man

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From: Atlanta metro Ga.

Certainly not nearly enough to justify the swap.. Need to go with a 2002+ LS6 cam at a bare minimum.

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May 25, 2005 | 06:38 AM

EdsC6Z06

Melting Slicks

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From: Central NJ

St. Jude Donor '05-'06-'08-'10

Quote:

Originally Posted by Minkster

What's a "pup cat"?? Smaller catalytic converter?

May 25, 2005 | 10:21 AM

#10

Dan_the_C5_Man

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From: Atlanta metro Ga.

Yes, just off of the header / exhaust manifold. Used on certain model years, notably 2000 and 2001; also dependent of location car was built for (California, etc.)

Jun 22, 2005 | 12:52 AM

#11

Minkster

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Melting Slicks

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From: Columbia, SC

These two sources seem to conflict with C5XTACY's data.

http://www.jakelatham.com/c5/misc/differences.shtml

http://forums.corvetteforum.com/show...s&forum_id=103

Who's correct?

Jun 22, 2005 | 01:55 PM

#12

Dan_the_C5_Man

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From: Atlanta metro Ga.

Quote:

Originally Posted by Minkster

These two sources seem to conflict with C5XTACY's data.

http://www.jakelatham.com/c5/misc/differences.shtml

http://forums.corvetteforum.com/show...s&forum_id=103

Who's correct?

What part? The cam specs? The post w/ the detailed cam specs match what I have in my "How to build a high performance LS1/LS6.." book.

Again, I wouldn't bother swaping your cam for a 2000 model, though.

Jun 22, 2005 | 03:59 PM

#13

Gordy M

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From: Northville, MI

For 2000, GM added the pup cats and went to smaller injectors, to compensate, they went with a more agressive cam. For 2001, they added the smaller cam, better intake and more efficient exhaust to make up for the 5 hp gain. However, may feel the 2000 really made more hp than advertised, esp. those with automatics.

Jun 22, 2005 | 04:57 PM

#14

Dan_the_C5_Man

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Quote:

Originally Posted by Gordy M

FYI, 99 was the first year of the 26# (smaller) injectors.

Jun 22, 2005 | 06:11 PM

#15

Minkster

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Melting Slicks

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From: Columbia, SC

Quote:

Originally Posted by Dan_the_C5_Man

Yes, I was talking about the cam specs. There seems to be two difference sets of opinion/data. One says there was a differenct cam in 2000 vs 2001-04, while another quotes the aforementioned 2000 cam specs as 2001-2004 specs.

I had to replace the engine in my 2000 FRC and went with a 2004 crate engine from the GM dealer parts list vice the original part no. for the 2000. There are no cam specs that I can find for the 2004 crate engine to see what is really there. This new engine is making 330 RWHP after a tune with complete Z06 exhaust, LS6 intake and K&N, but smaller 2000 MAF, injectors, and TB from the original engine. Charlie at A&A said that was very strong for essentially stock, and Andy actually looked to see that the heads were stock (241's) so was wondering what the cam really is.

Jun 22, 2005 | 07:38 PM

#16

The Wrench

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From: Rowlett, Texas

My 2000 non-California car made 228 with Blackwing and SLP catback as the only mods. On that day it was about 5-10 stronger than several comparable '97-'99 cars. So I think the .500 cam is worth 5-10 maybe. But the 2001's whip it on torque by 20 lb-ft.

Yeah, my shop manual says .479 on the lift too.
But it also show pictures of neat air vents in the fog-light shrouds.
We know those never made production (wish they had).

DG

Jun 22, 2005 | 11:40 PM

#17

C5XTASY

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From: Monticello MN

Quote:

Originally Posted by The Wrench

Before I had my new heads, cam, intake, injectors, longtube headers and high flow cats installed, a baseline was run on my 2000 C5. The car had a Blackwing, WCC powerduct, X-pipe and GHL's. The car put down 309.5 rwhp and 317.4 rwtorque, SAE and smoothed. The tuner told me it was the strongest, basically stock, A4, C5 he had ever tested. Just another data point on the 2000's. My car did not come with pup cats, by the way.
Ed