Thread: XP, SIX or XPZ CAM?

Hi everyone. Been a bit since I posted or tried searching the site. I can't get the search to work logged in or not, but I'm looking to get a CAM. I have ported heads that I ported and have been redone by my machinist. The car will be a mostly daily driver. I'm also planning on a 2,000 mile trip in the future.

I know people run the XP and S1X daily, but what about the XPZ. ZZP says 130lb exhaust and 150lb intake springs are needed plus a double roller chain. Do the springs or lifters wear out after a year or two? Are the comp cams lifters needed? Heard they have issues and are noisy.

I'll be running a M112 once the motor is broke in so figure that should make up for any loss with the XPZ drive ability and provide plenty to feed it. I was also trying to not have the car ridiculously loud but plan to quiet it down with a long resonator along with whatever exhaust I run. This will be run on my 98 Regal GS currently with stock exhaust. I have SLP and a new set of speed daddy headers on hand to choose from for the build.

You can daily ANY cam...just bump up the idle to 850-1000 RPM's and let it slide...the low idle is what kills the chains, IMO.

You can run 105's on a stock chain/dampner with the XP or S1X no problem...but like they say the XPZ will probably piss off a stock chain/dampner running 150/130 springs.

The stock chain had 200k miles on it so I replaced it with a Rollmaster single chain. Chain has about 10 minutes on it, but was looking at changing it to a double JP chain if running above the 105 spring. Heard they fixed their chain sets from those past failures. Thought at 130lb springs I would of needed different lifters.

Nope, stock lifters are fine...you can get some from Texas Speed for cheap: See 3800 FBody

Comp lifters suck...and are super noisey and clattery.

A few locals are running a new stock chain/dampner and are running cam setups larger than the XPZ...all on 105 or 130's...so, don't worry.

I am going with the S1X so that would be what I would go with

I checked out texas speed, compared to other's that's a good price for lifters if I had to change them. The lifters I'm using will be from my other engine with about 120k miles on them. Will stock lifters handle higher RPMs like the Comp Cams. The XPZ cam shows power up to near 7,000 RPM. I probably wouldn't want to run it past 6,500 unless I'm dynoing or looking to set a time at the track. For springs Crow Cams I hear is the way to go though I don't see them in 150 lb, only up to 130lb. Blue, did you run 150lb or 130lb springs in your other car and what brand? Friend of mine ran 105's and one broke. He now just runs the 90lbs after having to replace the motor. Have there been any failures lately with the Double JP Performance chain sets?

stock lifters can handle high rpm just fine, but most of us won't push past 6300 or so on a stout setup.

nick was running 130# springs. whether they are comp or crow, im unsure.

double roller failures are 98% of the time from installation error.

Originally Posted by Bio248

stock lifters can handle high rpm just fine, but most of us won't push past 6300 or so on a stout setup.

nick was running 130# springs. whether they are comp or crow, im unsure.

double roller failures are 98% of the time from installation error.

I was running Manley 130's with Titanium Retainers.

And a Rollmaster Double...busted one. Not a huge fan.

675.

Surged often.

Loved it.

Originally Posted by billyfrancis39

would the thrasher cam be good on a daily driver as well sorry not to still thread from you

Maybe if you left the idle at like 900+ RPM's...

But I still doubt it.

It's sized inbetween a IS3 and IS4 cam...it requires quite a bit of headwork to run.

Originally Posted by bluegtp91

I was running Manley 130's with Titanium Retainers.

And a Rollmaster Double...busted one. Not a huge fan.

I have the single chain rollmaster practically new and the manley retainers with comp cams locks. I was thinking of going for the JP double chain set. For retainers, are the titaniums that necessary? Also only see manley in 150lb now and jeez $250. Crow Cams are the only 130 lb springs I've seen available except for the Comp Cams which I've heard of alot of failures with them, including a local guy. His were 105s. I'll be running stock rockers with the cam.

Originally Posted by darkhorizon

Some JP chains were just flatout made incorrectly. Their failures are from improper chain/sprocket matches.

Stock lifters have no real rpm limit. They may want a bit extra valve spring but you will run into bigger issues past 6300rpms that have nothing to do with valvetrain.

That's about what I remember the problem being with that chain set. Has it been fixed yet?

Originally Posted by billyfrancis39

i didnt know i could run roller rockers with the thrasher cam i thought it was all bad

No.

The trick is the valve guides need to be milled. The point of roller rockers vs. factory non roller tip is the rollers are lighter than the stock ones...and the roller tips are easier on the guides. Also, a lighter valvetrain will promote quicker revving as well.

Running a really big cam you can run a stock ratio'd rocker and not need the extra lift from a higher ratio one.

People run 1.7's and 1.8's on VS, XP, S1X cams all the time...you just need to have the valve guides milled down for the extra clearance...seeing as anything from .550-.600 you need them milled .100". Anything more than .600 lift, as in the IS4 cam (which I think is a .604/.602?) is something I wouldn't know about...I'm not exactly sure how much you can mill the guides down to be honest.

IS4 is .600/.601, FYI.