Back in 2006 I spun a lobe on a Crane with about 11,000 miles on the motor. Pretty much the same results as seen here and it required a total rebuild. For my 408 build I picked up a '91 360 roller block. No more flat tappet for me.

After several days delay due to a dead battery and other unrelated issues, I finally had the chance to fire the motor tonight.

Once I got the timing close, it fired right off. Cam break-in was uneventful. About halfway through the alternator started howling, due to a bad bearing I'm guessing. No big deal but it was definitely startling.

The skies opened up during the break-in soaking the roads, so unfortunately there was no test drive tonight.

Need to hunt down a single groove pulley alternator now...

Jeeze, guys! You got me sweating bullets now I am in the process of rebuilding a 318 with a mild cam upgrade. Guess what brand I bought?? I got Comp's 20-221-3, and I figured I go the whole brand loyal route and ordered Summits kit; cam, lifters, springs, keepers etc. My machinist told me about the importance of good oil and additives and such and recommended a few brands. This is a near stock rebuild but my first with a cam upgrade. Wish me luck

Scott

Its not the cams, its the additives...Tim

I've got 2826 miles on my 416 stroker. Comp XE274-solid. Using the standard Comp solid lifters. No Issues. Edelbrock heads have standard Edelbrock valve springs. I have the Comp Magnum roller rocker that come bronze bushed.

Broke in motor using the Comp cam lube. Never used it since. 1st two oil changes used 15-w40 Rotella and Justice Brothers Engine Treatment (ET/33P) to replace the Zinc. Had plenty of oil pressure and that 15-w40 is sort of noisy so I now run Castrol GTX 10-w30 from Walmart, again with JB Engine Treatment (ET/33P).

No issues.

I've run the car at two all day road course track events, one autocross, and cruise RPM between 3600-3800. Car will see high rpm down long straight all the way to 6,000 rpm.

I took the car tonight to the grocery store 4 miles and back. Shifted at 5,000 only once . It's my only running car I own (have another vehicle provided by/for work). So it gets short trips also.

BTW... About 5/8 turn lifter preload this time. No cam noise.

I wouldn't have thought this cam would run quieter (same duration, more lift). Maybe it was the lifters.

Good job getting it back togeather!!

I have about 31k on my .060 over 318 since I built it about 3 yrs ago. Running an XE268H with the supplied Comp lifters and springs. Its a noisy SOB, especially when cold and at engine speeds of 2300-2700 rpm, but so far, so good. Used Rotella 15w-40 at break in, with Comp Cams break in lube and actually had the distributor gear off a bit, so it didnt start right away. Had one lifter collapse at 7000 miles, so I replaced it with a stock replacement type. Ok since then, but one on the left bank has bled down to the point where it wouldnt pump up without some coaxing a few times (used some Marvel Mystery oil directly into valve cover while running to pump it up). I will probably need to go in and replace all of the crappy Comp lifters as piece of mind before too long.

Runs great, excellent power band and decent low end torque. Still runs high 13s with 3.23s. Using 15w40 Chevron Delo oil, since my dad gets it for free, along with a bottle of STP 4 cyl oil treatment for added zinc. Oil changes are done every 1500-2000 miles with a Wix oil filter.

i feel your pain. my cam was crap after 1000 miles in my hemi and left me a slew of issues to have fixed because of it

471Magnum, sounds like its fixed, good for you. But I'm wondering, were the valve guides OK, not sticking? The problem occurred after you changed heads, and you said there was an oil use problem in that cyl, and you thought you had bad preload. I'm thinking the problem may have started from a bad guide in the new head, hopefully that's not still an issue...

I didn't disassemble the heads. I put my trust in IMM's quality.

I don't think it was a preload issue. The adjuster on that rocker was set no different than any of the others. That said, they all might have been too tight and that one was just first to go. Or it may have been my choice of oil.

Oil consumption was probably due to the intake lobe being wiped. There was pretty much no valve lift remaining. Without the valve opening, it was pulling a bunch of vacuum in that cylinder and sucking oil past the rings. That's one theory anyway. Similar thing happened when I lost an intake rocker on a 440 several year ago.

This cam is much quieter than I ever recall the other being. It's a very similar grind to the old one (XE274H vs XE275HL), albeit with more lift. I expected more noise if anything. Makes me wonder if there may have been an issue from day one with the old set up that I never noticed.

It seems like everyone, including me, has lost a flat tappet at one time or another. I've asked this question before but never gotten a reply; has anybody tried the composite lifters available through 4secondsflat? http://www.4secondsflat.com/Composite%20lifters.htm

i've got a set on my MOPAR SB but haven't run it yet because i'm spending all my free time with representatives of the medical fields... i hope to have it running in a month or so and will definitely post a sound file if nothing else.