'01 LS6 Cam Specs with 1.8 ratio rockers

C5Vette

C5Vette

Forum Member
Does anyone here know what an '01 LS6 cam with 1.8 ratio rockers would yield for cam #'s? 1.7's yield this:

204/211 .525/.525 116 LSA
 
204/211 .555/.555 116 Roughly. I think the duration gets affected very slightly also but to what degree not sure. But why not just go with a 02+ ls6 cam on a stock rocker 204/218 .551/.551 117.5.
 
I've got a line on a good deal on roller rockers in a 1.8 ratio and the centerline on the '02 is different (smaller) requiring the longer valves (.6mm) or different size pushrods....

Ray
 
C5Vette said:
....requiring the longer valves (.6mm) or different size pushrods....
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No it doesn't ;)

If you have that 01 cam already in your car than I can understand. But if you are looking at cams then go 02+.
 
QUASAR said:
No it doesn't ;)

If you have that 01 cam already in your car than I can understand. But if you are looking at cams then go 02+.
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Do you KNOW this? Everything I've looked at shows that it is smaller and that the sodium filled valves and hollow valves are .6mm longer, otherwise the rockers are off-center on the valve tip....

"The LS6 used lightweight valves with hollow stems starting in '02. The hollow intakes saved some weight, but the hollow exhausts were filled with sodium so they ran cooler. Both of these valves are 0.6 mm longer than the others because the cam for the '02 LS6 had a smaller base circle"

http://www.automotiverebuilder.com/ar/eb040538.htm

Ray
 
I am aware of all of that. And I am telling you that you can put that cam into an LS1, put the stock pushrods back in, and drive off.
 
yeah, I figured I could put it together and it would work. I just don't want to put any odd angle stress on the valve seats/seals. Do you know of someone that has done it? What were their results? I am planning 243 ported castings with stock valve sizes and LS6 springs, LS6 intake, Ported TB, Opened MAF, Harland Sharp roller rockers (1.7 or 1.8--Got a line on a great deal on 1.8 only) and the cam that works for me......I already have everything except for the MAF housing and the cam and rockers.

Ray
 
If you bring in milled heads and different head gaskets into the equasion thats a different story. You'll have to do some homework on what pushrod to use. But for untouched heads and stock gasket, stock 7.400" length rods will work. The lifter will absorb the rest of the difference.
 
FYI: The LS2 cam is the '01 Z06 cam.

If you're going through the trouble of changing the cam, porting heads, and all that other stuff, why bother with such a little cam. Hell, the 224/224 cam is considered small these days. Either stock Z06 cam is downright tiny. I'd step up to something bigger if you're going to be in there anyway.
 
C5Vette said:
yeah, I figured I could put it together and it would work. I just don't want to put any odd angle stress on the valve seats/seals. Do you know of someone that has done it? What were their results? I am planning 243 ported castings with stock valve sizes and LS6 springs, LS6 intake, Ported TB, Opened MAF, Harland Sharp roller rockers (1.7 or 1.8--Got a line on a great deal on 1.8 only) and the cam that works for me......I already have everything except for the MAF housing and the cam and rockers.

Ray
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I had a friend do this to a 2000 Corvette, and had no problems whatsoever.. car ran strong!
 
315plus said:
I had a friend do this to a 2000 Corvette, and had no problems whatsoever.. car ran strong!
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Do you know what ratio rockers he used?

Also, I don't really want to advertise there is a cam in there.....That's why I'm choosing one of the ZO6 varieties. I wouldn't mind something a little more stout but this isn't the car I'd make into a street racer...I just want to keep up with the traffic with this one. All my digging tells me that the stock LS6 springs approach coil bind at or near .585 lift. That is why I'm concerned about using the LS6 cam with 1.8's. (02+ being around .551 plus the increased ratio) That is why I was asking about the 01 with the 1.8's I could put in the 02+ with 1.7's ????? I'm open to suggestions......

Let the opinions roll!!!!

Ray
 
Check out Thunder Racing's "Old Man" or "CheaTR" cams. They'll make more power than the LS6 ones while still sounding stock.

Thunder Racing Custom "Old Man" Camshaft - 214/220 .600/.523 115 LSA This is the perfect cam for someone looking for a stock range power band and stock sounding idle. Significant horsepower gains throughout the RPM range. No computer tuning required. Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended.

Thunder Racing Custom "CheaTR" Camshaft - 214/230 .601/.578 117 LSA. Off Idle-6800 RPM Power Band. Broad power range. Works well with stock exhaust manifolds and catalytic converters. Stock like idle. Minor tuning required on automatic transmission cars. Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended. Double valve springs and titanium retainers required for this cam.
 
I would (and did) get better springs. If you click the link above, it'll bring you to Thunder's cam page. They have cam kits that include pushrods, Comp 918 springs, and the cam for $599. Titanium retainers are $130 more. The CheaTR says that it requires double springs and Ti retainers, so it would be a few bucks more. Call Thunder and see what they have to say. They definitely know LS1s.

I just hate to see you go through the pain of a cam swap with decent heads and the rest of the supporting mods and then go too small on the cam and leave hp on the table. If you're on a budget and have to use the springs that you have, then you'll have to limit the lift. I don't know the max but I'm sure you can find it on LS1Tech.

-Matt
 
If cost is an issue, you can find ls6 cam and spring packages for 200 or less. The ls6 spring is only good to .550-ish so it will handle the cam but not the 1.8 rocker (02 cam).
 
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