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  #31 (permalink)  
Old 07-30-2013, 12:06 AM
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Quote:
Originally Posted by tresi View Post
There still is the possiblility that you got a hold of 2 bad cams or lifter sets or 1 bad cam and 1 bad lifter set.
Well I "owned up" to the first cam failure. My friend (a Ford mechanic) and I both made a lot of mistakes.

1.) He tried to prime cold 15w40 Rotella T using a cordless drill. As soon as the pump sucked up some oil, his drill stopped dead. "No worries, the engine will have oil pressure as soon as it fires up"

2.) I had washed the OLD original HEI up with varsol, which apparently was a bad idea. It would fire intermittently, but wouldn't run. We stopped trying after a couple of attempts, but ...

3.) Ordered an installed a reman HEI, and it fired right up. And then ... he started making curb idle adjustments, and ran to get his timing light. All the while at 600 rpm or so. He ignored my thumb-up gesture and verbal suggestion that we needed to get the RPM's up to 2500. When he went for his timing light, I actually did that myself, and he came back excitedly shaking his head. Keep in mind this was open headers, hard to converse.

4.) He killed the engine trying to move the distributor. That's when I told him about the 2500 RPM thing. He went into the "I've broken in many engines and have never heard of that, nor have I ever had a problem" story. We restarted and he continued to fiddle with it.

It wasn't until I got it back home to my newly-completed garage and put some mufflers on it that I heard the "ticking".

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  #32 (permalink)  
Old 07-30-2013, 12:18 AM
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Here's a link to the FIRST cam failure.
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  #33 (permalink)  
Old 07-30-2013, 04:56 AM
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Originally Posted by 66GMC View Post

Then again ... I suppose the worst case scenario would be another $200 flat-tappet cam and lifter set ...

Wow. You're a brave guy. After two cams I wouldn't consider another FT.

Go roller as you stated you would do after the first one.
There's nothing like driving around with peace of mind.....ahhhhh....
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  #34 (permalink)  
Old 07-30-2013, 08:49 AM
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Go roller; or get off the XE platform and hold your breath. BBCs have enough inherent 'eccentricities'; lets not add more.

If you don't want to go roller; call one of the specialty companies like Chris Straub or Mike Jones. Chris has Morel lifters on his website. Chris also sells Clay Smith cams; he may have an off the shelf grind that works for you. For the 2 rebuilds you've done, a roller cam would have paid for itself. Your buddy obviously doesn't build flat tappet motors that use modern oils; please don't let him 'help' you with this, its costing you a fortune.
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  #35 (permalink)  
Old 07-30-2013, 01:26 PM
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OK,OK ...

I've been looking at roller cams all morning and have decided that Comp's XR282HR (11-432-8) seems to fit my build to a "T"

Quote:
Hydraulic Roller-High performance for street cars with 2000+ stall, 9:1+ compression, headers. RPM Range: 2200-5800
230/236 dur, .510 lift, 110° LSA

I've also figured out that I need to use different pushrods (7815-16) and a cam button so I may as well go "all-out" and just pony up for the whole kit.


Yes, I also looked at Lunati and Crane ... but didn't find the specs I was looking for.

Yes, I know I could special-order a "custom grind".

No, I don't own shares in Comp.

edit: Actually ... it looks like those pushrods are not in the kit. Another $45.00
Oh well ...
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  #36 (permalink)  
Old 07-30-2013, 06:03 PM
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Thanks,
I'll be sure to include that Moly paste in my shopping list.

Moroso 35000
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  #37 (permalink)  
Old 07-30-2013, 07:49 PM
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Keep the moly paste.Question??. What would be a sure bet not to have this problem????. Come on now you know the answer. You have been told by how many members here??. OK I'll give you a tip. A roller cam. I have reserved a place on the wall of my shop to bang my head against. It isn't a issue with BBC!!. It's you making the same poor choices over and over again. Oh well I(we) tried to help.....
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  #38 (permalink)  
Old 07-30-2013, 08:02 PM
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Just want you to remember every oil change you do for the entire time you own this engine,to use oils like Gibbs oil and paying more for it.First time you don't stand a chance to flat spot a lobe.Syphilitics(sp)??. Forget that. It's the worst thing for flat tappet cams. So as you go in time paying more for the oil,your making payments that at one point or another will end up equaling the costs of a roller cam and never end up own it. Gook luck
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  #39 (permalink)  
Old 07-30-2013, 08:35 PM
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................................................

Last edited by 66GMC; 07-30-2013 at 08:42 PM. Reason: Saving my breath
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  #40 (permalink)  
Old 07-30-2013, 11:17 PM
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@Gary

1.) I just finished saying that I was convinced by the membership here, and seriously considering the possibility of going to a roller cam.
Quote:
I've been looking at roller cams all morning and have decided that Comp's XR282HR (11-432-8) seems to fit my build to a "T"
2.) There was only ONE "over and over again", by my count.

3.) You gotta stop banging your head Gary. Seriously.



Yeah, I know I said that I was going to a roller after the first one crapped out ... but I KNEW (and freely admitted) that several mistakes had been made. Was that the fault of the camshaft? No. So I tried another one.

This second cam was, I believe, broken in correctly.
Compare these pics. Zoom right in on the first one, taken 06/17.

As near as I can tell, there aren't any signs of the rough edge there.


This one was taken this evening, and seems to indicate that the damage is very recent.
One theory might be that I'm guilty of making another error when setting the lash ... lobe not on base circle (as was suggested previously in this thread).

I'm also "guilty" of following "the easy method" that I read on the internet. I did follow these instructions and checked them off in sequence.

So who knows? My neighbor stopped by and didn't like the way that the lobes lined up with the lifters. We got to pushing and pulling on the cam, which is still in the engine, with the timing set still in place. The distributor is out which I'm sure factors in to this, but there was approx 1/4" of in/out (endplay).

I'm hoping a machine shop can solve this mystery, once and for all, and put an end to a lot of this speculation.
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  #41 (permalink)  
Old 07-31-2013, 12:01 AM
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If you don't change things nothing changes is the msg here.
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  #42 (permalink)  
Old 07-31-2013, 05:40 AM
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Quote:
Originally Posted by 66GMC View Post
My neighbor stopped by and didn't like the way that the lobes lined up with the lifters.
Ahh yes- the "helpful neighbor". *sigh*

The cam is purposely not in alignment to the lifters. In other words, the lifter isn't going to be right in the center of the cam lobe. The way the cam lobes are slanted and the lifter bottoms convex causes the lifters to rotate.

The combined forces of the cam lobes and distributor/cam gears causes the cam to be forced backwards into the block. But there's a possibility the cam may move fore and aft in use, and if there's enough movement to cause the lifter's contact point to ride off the edge of the lifter, damage will occur. But this is not usually the case, obvoiusly. Some here recommend using a cam button like for a roller cam to set the end play even on flat tappet cams. Something to consider.
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  #43 (permalink)  
Old 07-31-2013, 09:47 AM
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All the help in the world doesn't mean a darn thing unless he understands he has already paid for the roller cam with what he has done to date.And now is the time to end all that by purchasing a roller cam..........
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  #44 (permalink)  
Old 07-31-2013, 10:04 AM
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All the help in the world doesn't mean a darn thing unless he understands he has already paid for the roller cam with what he has done to date.And now is the time to end all that by purchasing a roller cam..........
I really hope you're right Gary ... that purchasing a $1000.00+ worth of cam, lifters, pushrods, springs, timing cover, cam button, etc. DOES end this frustration.

IF it does ... you have my full permission to say "I told you so."
Deal?

(But I still think that cam was broken in properly, and that *something* happened to it very recently.)

Some of this, perhaps? (Just another theory at this point.)


Or maybe this? (which I believe to be caustic soda left over from the hot tank)

Last edited by 66GMC; 07-31-2013 at 10:18 AM.
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  #45 (permalink)  
Old 07-31-2013, 10:39 AM
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Were the lifter bores machined?
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