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  #16 (permalink)  
Old 02-19-2012, 02:12 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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  #17 (permalink)  
Old 02-19-2012, 02:21 PM
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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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  #18 (permalink)  
Old 02-19-2012, 02:25 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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Old 02-19-2012, 02:27 PM
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Originally Posted by lmsport
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.

I will contact Mike in the morning and see what he got for me. Thanks for the reply.
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Old 02-19-2012, 02:30 PM
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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?
No mines is brand new stuffed in the short block now, but I do not want to have to deal with it later, so I'm just looking at swapping out the cam with a good set of lifter now.
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  #21 (permalink)  
Old 02-19-2012, 02:45 PM
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Quote:
Originally Posted by 1969chevyss
The 268 has to be a good grind cam, because people are still buying them.
Your logic is flawed. People still eat red meat and fat, knowing full-well that it will clog their arteries and may cause heart disease. Just because people buy these fosdick grinds does not mean that they are any good.

Read through this tutorial and see what you're missing....
http://www.crankshaftcoalition.com/w...ips_and_tricks

Last edited by techinspector1; 02-19-2012 at 02:56 PM.
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Old 02-19-2012, 03:44 PM
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The only problem with the XE268H-10 cam is It's too small to be a big cam and too big to be a small cam..
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Old 02-19-2012, 04:11 PM
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I will definitely read the article and decide on a new cam and lifter. Before I bought the cam I made a thread on what will be the best cam for my build and this was what was recommended. Now since I have found out how poor these cams lobe wear is, now it's not a good cam. I will read some more on this matter and if anyone has anymore input feel free to post back. Thanks
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  #24 (permalink)  
Old 02-19-2012, 04:35 PM
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I am looking at the isky mega cams now. Which cam would be good with my 355 10 to 1 cr with a stock stall converter. The mega 268 doesn't have as much lift as the xe268h. This is a street only car that needs to have a good lope at idle like the xe268h
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Old 02-19-2012, 05:05 PM
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Any cam that has a lopey idle will not run its best when using a "stock" torque converter. Including the xe268H-10.

if you want to run the xe268-10 cam or a similar cam get a high stall converter.

3000 stall is good 3500 stall for max drag launch performance.

It will idle better and go way better with a high stall.

The Isky Mega Cam with .450" lift is the same deal. Isky #201268.
Best with a high stall. The modest .450" valve lift makes it a easy install using a stock vortec head with a simple valve spring swap ( minus the inner damper)
( isky #205D ) you can reusue the OEM stock vortec head retainer, locks and valve seals and rocker arms.

If you want this cam on a different LSA, other than 107 call Isky for a custom grind.

Works best with a stall, some rear gear and a distributor recurve.


If you must stick with a stock converter pick a cam with less duration.

211 to 218@.050" Much better w stock stall .

if you want the lumpy cam sounding cam, get a 3000+ stall for it.

Proper cam, converter stall and rear gear match up is critical
if you want a successfull combo.

The higher lift version Isky 270H Mega #201271 with .465" lift requires a simple "getto grind" on the bottom of the stock vortec retainers to get enough clearance at full lift. Use the same isky 205D valve springs
Measure what you got there first. Then grind approx .020" to .030" of the bottom of the retainer.

Another great street cam. Again a 3000+ stall is best.
You won;t regret going for the stall converter for any of these cams suggested.

You know there is nothing stopping you from machining the vorted head valve guide boss shorter for more lift clearance and and the spring seat a little bigger for high perf springs and aftermarket valve seals.
Its not hard to do. The machining tooling is readially available.
Can be done at home if you have a clue. If you don;t, get a local qualified machine shop to do it for you.

99% if cam lifter failures are installer error.

Last edited by F-BIRD'88; 02-19-2012 at 05:28 PM.
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  #26 (permalink)  
Old 02-19-2012, 05:34 PM
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I have no problem machining the guide bosses for more lift if I have to. I was originally looking at the comp xe262 so maybe the isky 264 would work for me. I'm not sure what grind cam I have in my 350 now until I pull it out of the car but the sound is good enough for me with the custom exhaust I have. I'm calling isky in the morning and ask out the 264 and 268 grinds.
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  #27 (permalink)  
Old 02-19-2012, 05:40 PM
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Quote:
Originally Posted by 1969chevyss
This is a street only car that needs to have a good lope at idle like the xe268h
AWWW, phooey.
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  #28 (permalink)  
Old 02-19-2012, 06:48 PM
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I had a cam fail in my Pontiac 400 it was a xe275h. I,ve been a mechanic all my life, this is the first cam that failed. I went to a roller, hope for the best. Comp gave me credit for the old one but I had to pull the motor and rebuild it. Pain in the rear! Oh and $ .
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  #29 (permalink)  
Old 02-19-2012, 10:43 PM
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Does any of this stuff apply to the FORD 302 HIGH energy cam (not extreme energy)? I am looking at a comp cams 31-255-5 computer controlled cam, which on the camquest dyno software puts me at 330 ft lb, which is more than a stock 351 (which is what I am going for).

However I am scared to death about changing the cam. I cant afford to rebuild the engine if I wipe a lobe out....
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  #30 (permalink)  
Old 02-19-2012, 10:58 PM
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Quote:
Originally Posted by Torque454
Does any of this stuff apply to the FORD 302 HIGH energy cam (not extreme energy)? I am looking at a comp cams 31-255-5 computer controlled cam, which on the camquest dyno software puts me at 330 ft lb, which is more than a stock 351 (which is what I am going for).

However I am scared to death about changing the cam. I cant afford to rebuild the engine if I wipe a lobe out....
No chevies and fords run on completely different laws of physics.

You best take the desk top computer simulation program with a big grain of salt.
Especially if the rest of the motor is stock.
It ain;t that simple.
The biggest effect of installing a larger cam in the stock motor is it shifts the torque curve up in rpm. Ususally always at the expense of low rpm torque.
The smaller the CID of the motor the more dramatic the effect and the neg effects of any cam choice.
its very easy to over cam a 302.

Moderator: Consider starting a new thread for Torque454 and 302 Cam stuff.
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