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Old 02-18-2012, 11:41 PM
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Xe268 wiped lobes

Hey guys I have a 355 short block with a xe268h cam stuffed in her. I have a set of vortec heads that I will get new springs to accomodate the extra lift. My question however is this, are there any other good lifters besides the ones that comp cam recommend(812-16) that will help me prevent the chances of my cam going flat. I have been doing a lot of reading and this seems to be a reaccuring problem with this grind. My next question is for my vortec heads, what sprints can I use that will drop right in without any machine work. I read that z28 springs from northern for 525 lift will work, just would like to get you guys opinion on the matter. Thanks in advance.

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Old 02-19-2012, 12:43 AM
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How much is it to have a custom grind done?
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Old 02-19-2012, 12:56 AM
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Thanks for the reply, I will definitely give them a call Monday and see if they recommend the custom grind. I will go and price the z06 springs and comp 787 retainers.
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Old 02-19-2012, 01:33 AM
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As F-Bird says, if you listen to guys that don't do any research they will rawdog Comp Cams all day long. In reality when Johnson and a couple other lifter mfg's quit making lifters for a while a chit load of cheap crappy Chinese lifters came across that were made of inferior material....hence wiped out lifters and accompanying cam lobes. Johnson is back in business but if F-Bird says use the GM lifters then use them, he is a man that knows of what he speaks.

You can also do a search function on this forum..."cam break in" or something of that nature and you'll get all kinds of info. Most very good and then some not very good.
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Old 02-19-2012, 12:03 PM
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From what I've been reading, Johnson makes alot of people lifters, trick is to find out which ones. I found a guy name Mike Jones from Jones cams and they sell Johnson lifters. I think even the Speed pro are made by them too, but I will do some calling around and find out for sure. I went on Summit and found these GM Performance lifters for a 350 sbc part number 12371044. Not sure if these are the ones that you were referring to as the GM Heavy duty or not.
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Old 02-19-2012, 12:25 PM
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I am running an Isky Mega cam & I like it a great deal.. great street manners.
Vortec heads w/ the z28 outer springs... verify clearances tho.

fBird88 recommended the set-up. Fun when the TH350 grabs second & the tires break loose (note: NOT chirp!).

Me like!
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Old 02-19-2012, 01:57 PM
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Comp Cams

Compcams flat tappet hydraulic failure rate is unacceptable. They know there is a problem and their answer is to keep their fingers crossed and hope for the best. I really like the Compcams grinds but I would not use anything from Comp again. When a cam fails, this requires a complete teardown. Will Comp stand behind the product. Hit and miss. If they know the XE series has high fail rates, why woudn't they nitride all cams in this series. It's simple, it's about customer service and doing the right thing, not excuses. How many out there are using Comp xe series cams? Did your cam fail?
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Old 02-19-2012, 02:47 PM
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When ordering a flat tappet cam always order a P-55 cam core and use only GM lifters with the steel bottom and use a good oil.

I use a lot of flat tappet cams in my circle track engines never been an issue in 38 years.

I use CENPECO 20/50 oil which has 2300 PPM of zinc.
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Old 02-19-2012, 02:49 PM
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Quote:
Originally Posted by Studebaker
Compcams flat tappet hydraulic failure rate is unacceptable. They know there is a problem and their answer is to keep their fingers crossed and hope for the best. I really like the Compcams grinds but I would not use anything from Comp again. When a cam fails, this requires a complete teardown. Will Comp stand behind the product. Hit and miss. If they know the XE series has high fail rates, why woudn't they nitride all cams in this series. It's simple, it's about customer service and doing the right thing, not excuses. How many out there are using Comp xe series cams? Did your cam fail?
comp,cams failures are caused by lack of correct oil, and the fact that they have a problem with a line of fakes, being sold as comps.
We've never had a camp.s go flat, but we use the correct oil, liter springs for break in, and buy directly from comp. bypassing the chance of being sold a fake(counterfit) . that a major speed shop is halking.
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Old 02-19-2012, 02:51 PM
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Geez, what is it with you knuckleheads and these extreme grind cams?????
Have you not heard and read enough horror stories yet?????
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Old 02-19-2012, 02:56 PM
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Quote:
Originally Posted by techinspector1
Geez, what is it with you knuckleheads and these extreme grind cams?????
Have you not heard and read enough horror stories yet?????
I've been using rollers for the last few years, flat tappets are not woth it anymore
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Old 02-19-2012, 03:03 PM
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Quote:
Originally Posted by techinspector1
Geez, what is it with you knuckleheads and these extreme grind cams?????
Have you not heard and read enough horror stories yet?????
I have NOW. LOL, I have been leaning toward the crower 60918, or lunatis 60901lk. I think the crower is a tad rowdier, but not much.
It will be for a 400 pontiac (389 block @4.120) zero deck,82 CC heads , if anyone GAS.
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Old 02-19-2012, 03:12 PM
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Quote:
Originally Posted by CNC BLOCKS NE
When ordering a flat tappet cam always order a P-55 cam core and use only GM lifters with the steel bottom and use a good oil.

I use a lot of flat tappet cams in my circle track engines never been an issue in 38 years.

I use CENPECO 20/50 oil which has 2300 PPM of zinc.

What do you mean a P-55 cam core, is that cast iron material and what is the part number for the GM lifters.
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Old 02-19-2012, 03:21 PM
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Quote:
Originally Posted by techinspector1
Geez, what is it with you knuckleheads and these extreme grind cams?????
Have you not heard and read enough horror stories yet?????

The 268 has to be a good grind cam, because people are still buying them. Wouldn't using the right quality lifters, correct cam break in and correct oil during and after break in work? I'm just trying not to buy an new cam, but if I keep reading and getting you guys opinions, I probably will. Thats why I'm not in a hurry to complete this build. I spent almost a month deciding on buying the right oil pump to make sure I didnt get one that will break off on me, there is alot info about that out there too, but most of the problems of the articles i have read were a few years ago and I assume that Melling has fixed that problem now, but since I wasn't sure I sure installed the 10553 Select series pump.
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Old 02-19-2012, 03:25 PM
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Failures of CC go back many years before the change in oil additive content.
Just buy an Isky. They're made better, and make more power.

Better yet, get a cam and lifters and springs from Mike Jones.
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