96-97 Cam specs buy in

[SappySE107]

92 cam specs

seat to seat specs

Intake lift .370". 223 duration. 110 centerline. (i question the centerlines now)

IVO 1.5
IVC 41.5
EVO 44.6
EVC 4.6

4 degrees valve overlap.

Exhaust .370" lift. 229.1 duration. 110 centerline.

6.1 degrees overlap

.050 specs

Intake 205.8 duration, Exhaust 211.9 duration
IVO -7.1
IVC 32.9
EVO 36
EVC -4

-11.1 overlap

Lifter acceleration rate 3.0 (1-5 scale, stock is usually closer to 2).

[Mach10]

Hmmm... A hair more duration....

That would explain why the 95+ idle a little smoother, and why they don't make much more power even with a better intake and exhaust.


Awesome work, folks! You guys rock!

[OldSkoolGP]

Well there you have it. By the slightest of margins, the old ones are better, if you can call it that. More overlap helps certain things, I think I'll stay with my good ole 91-95 cams for now. But those 96s will definitely be up for a regrind.

[your_I.D.]

Re: 92 cam specs

-11.1 duration

Lifter acceleration rate 3.0 (1-5 scale, stock is usually closer to 2).

-11.1 duration?

wazz that for?

Did you mean overlap?

[SappySE107]

Yes I did. Im going to have to disagree with the centerlines this place has given us. GM states 91-93 are 111 and 112 centerlines. Ill readjust them and see what it comes up to. This will need to be done for the 96 cams as well.

[series8217]

You guys are awesome for doing this. Thanks for sharing the information!

[Mach10]

Hmm... something's bothering me here... How on earth is the 0.050 specs showing the intake valve opening BEFORE the seat-to-seat times?!?

The numbers don't smell right. I think I'm going to do some cam timing on my own with my 94 and a degree wheel.

[Mach10]

Yep, it's decided. I want to go with the 4-exhaust cam route, but the timing info that I have here just won't cut it to figure out appropriate timing.

So, I'm going to index a '94 motor with stock cams.

If anyone wants to tip the machinist, I might be persuaded to do the same thing with a set of 92 cams...

Not that I think there's a hell of a lot of difference.


So, I gotta go out and buy meself another dial micrometer

[napatiger]

GM offered 14 different set of cams for the LQ1 over the years...so likely there is at least a small difference between every year and maybe within the year or make.

What was the casting code on the cams that got spec'd

[Mach10]

I'm not so convinced; different casting codes could mean as much as a different cam profile, or as little as a trace number for different foundries.

I've got the carriers on my bench. I'll be posting up my own findings later.