SideStep

Putting cam in friends C5, engine noise is a concern…
If all other variables are the same (PR length, spring-type, head-milling, etc…) XE lobes make less valve-train-noise than XE-R, right??? Say something like 220/224 XE vs. 220/224 XE-R…

I have never used a XE based cam so I have no experience in that area...

Billiumss

iTrader: (11)

I'd like to know as well...

1ImperialSS

iTrader: (5)

XER lobes, im sure you know, include faster ramping rate. it will pop up the rocker and snap it down. IMO if you had the exact pushrod length necessary, decent springs and lifters that are in good shape the noise level should be about the same but as with any aftermarket valvetrain noise will be there...

dnm12

iTrader: (13)

i have the XER 224/224 and it can sound like a sewing maching at certain RPM's basically with my exhaust you hear the car and vavles closing and opening, but cats or any muffler would help that out a bunch

Black Z28 M6

XE-R lobes do have a very fast ramp and have more lift. They are an aggressive cam
XtremRPM cams
Comp has two types, XtremRPM, and XtremRPM high lift
Now Comp has LSK lobes and are more aggressive than XE-R
Since XtremRPM cams high lift are not really high lift at all when compared with XE-R
and LSK they can use 26915 springs but I would still use the 26918 springs
All other variables are the same (PR length, head milling, spring type etc.)
I would think that they make less noise

SideStep

I am hoping... for the less noise... BTW Comp has several lobe profiles to choose from not just two.... XE, XE-R, XFI (which some say are the same as XE-R), LSK....etc....

redtail2426

iTrader: (10)

noise and reliability were the two main reasons i went with the xe-lobe..The exhaust valve is the one that is making the noise so if you went with a xe-r lobe on the intake valve and a xe lobe on the exhaust it would help..My setup is pretty quite and i am pleased with the power output for the older xe lobe design..

SideStep

When you say pretty quiet... do you have any valve-train noise???

redtail2426

iTrader: (10)

um i would say yes i do.. When my car was bone stock it was not that quite either though...Its just a very little bit where you cant hear it when the hood is closed or from inside the car.My valvetrain was much louder when i had the gt2-3 cam and comp 918's..The gt2-3 is supposed to have mild lobes to.Both of my setups have the correct length pushrods to maintain the stock preload of .080 to .100" .The only time you hear the valvetrain is when the hood is open and you are stading over the engine.I thought it was going to be loud because of the dual springs(patriot gold dual) but i was pleasantly suprised.

Black Z28 M6

If AFR or CompCams would come up with a REV-Kit all these problems would really matter.
Cause as long as you dont float valves who cares about valvetrain noise
Your making alot of power
The more aggressive cam you get (The big ***** cams) are going to have valvetrain noise
My Camaro makes noise and my 71 chevy short bed also makes noise but the truck has a XE solid roller (350 I gen) AFR 195 heads AFR REV-Kit and it make 429rwhp on a 770cfm Holley (Caborator engine)

I wish some come out with a REV-Kit for LS1/LS2 we all were make more power

Black Z28 M6

If AFR or CompCams would come up with a REV-Kit all these problems wouldn't really matter.
Cause as long as you dont float valves who cares about valvetrain noise
Your making alot of power
The more aggressive cam you get (The big ***** cams) are going to have valvetrain noise
My Camaro makes noise and my 71 chevy short bed also makes noise but the truck has a XE solid roller (350 I gen) AFR 195 heads AFR REV-Kit and it make 429rwhp on a 770cfm Holley (Caborator engine)

I wish some come out with a REV-Kit for LS1/LS2 we all were make more power

SideStep

...because he is a C5 owner which means fickled...

BOWTIE

If he is that concerned about noise he should invest in a set of adjustable rocker arms, or better yet, a set of adjustable rocker shafts. I still think most of the valvetrain noise associated with cam swaps is due to the fact that we are trying to set preload with different length pushrods and can only get it close. Perhaps I am just old school, but you should use different length pushrods to get your geometry correct, then an adjustable valvetrain to set your lash/preload.

BOWTIE

Oh, by the way Agostino Racing Engines came out with a REV kit for the LS1's years ago (back before all of their problems), but discontinued it due to lack of interest and no one was buying them. Of course back then a 224/224 cam was huge for an LS1. I have written them suggesting that they re-release them now that cam technology is such that the springs can not keep up, but they acted like they were not interested. They were using a modified LT1 AFR REV kit if I remember correctly and maching some of the pieces in house. It would work perfectly with todays large cams because it exerted pressure on the outside of the lifter bore, so you would have the valvetrain stability of a larger valve spring package, but would not be collapsing the hydraulic plunger in the lifters from excessive spring pressure. From my understanding that is the largest hold back on hydraulic rollers potential.

Black Z28 M6

Yeah I remember that. When I auctualy got the ***** to do a head and cam swap, they stop selling that REV-Kit.
Hey you got some good number on just bolt-ons

BOWTIE

Thanks... I thought they were OK and was fairly happy with them, but lately I have seen similar numbers getting high praise so I guess I shoould be happier. Especially considering those were through the 35 spline 9" with 4.11, steel driveshaft and I have the old LS1 heads (99 models, I forget the casting #), I also still have the mechanical water pump and stock balancer/pulleys. Unfortunately due to driver error (3-4 shift ending up in 2nd at the track) it is now sitting broke and waiting on me to decide what to do.

00cls1camaross

iTrader: (10)

slap a 4L65E w/ 4k stall in that bitch