Sure gets annoying when.....................

[napa68]

You gotta revisit what you have done already. Not even 500 miles and I have a valve train issue that shows up after 2000 rpm on the left bank. I would say I have a cam bearing issue. Out it comes! Just kind sucks.

Off to the machine shop and regroup before something gets wrecked

[Tracker1]

I feel for ya. That sucks. [img]<<GRAEMLIN_URL>>/no.gif[/img]

[RST]

Oh man what a bummer, sorry to hear, hang in there, you will be back on the road in no time.

[Postsedan]

Better now, than more damage later - taken with a grain of salt.

Dan

[Mr. Chevy]

I KNOW EXACTLY what you are going through very well unfortunately. I had a major issue with my 396 69 Chevelle Motor and it had to come out after the total rebuild and instillation. Really sucks!! Only positive is that you can have these motors in and out of the engine bay relatively quickly. Not like todays cars...

Good Luck!!

Rich

[Day2_69Z]

Hmmmm, a cam bearing noise on the Left Bank ??? Cam bearings are fixed to the bore journal ,centered on the cam ...... Both Banks would have a noise.
Doesn't sound right to me either....

You don't think its a bad Rocker Arm, pivot ball, lock nut or an issue with a Rocker arm Stud ?
A too long or too short pushrod ?
Just my thoughts. .. somewhere on the Left bank you may want to check.

[napa68]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Day2_69Z</div><div class="ubbcode-body">Hmmmm, a cam bearing noise on the Left Bank ??? Cam bearings are fixed to the bore journal ,centered on the cam ...... Both Banks would have a noise.
Doesn't sound right to me either....

You don't think its a bad Rocker Arm, pivot ball, lock nut or an issue with a Rocker arm Stud ?
A too long or too short pushrod ?
Just my thoughts. .. somewhere on the Left bank you may want to check.
</div></div>

Right side is a problem too. #5 more than anything. Collapses over 2000 rpm when the oil temp comes up. Go back to idle, pumps back up. Changed out all of the lifters (cam and lifters looked good), the same problem. Oil pressure is well north of 70lbs cold (idle) and is at 50lbs at a hot idle (stock pump and spring) Checked valve springs...............they were new and good. Gotta pull it apart before something gets wrecked.

[earntaz]

Did you have the engine running before rebuild -- or did you obtain the block from another source? The reason I say this is a friend of mine had the same issue and found there were oil restriction devices in the cam galleys. The block was used for racing and had them installed to control how much oil went to the lifters. TAZ

[camarojoe]

I just went through something similar, but &quot;only&quot; had to remove the heads,(and intake of course) leaving the motor in the car. Initially thought I had a collapsed lifter, but ended up being a badly worn valve guide. Took off both heads and had them all replaced to be safe. Still not sure how or why there was so much wear with so few miles, but in any case... one more thing to look for.

[napa68]

The engine (block, heads, intake, etc) are all original to the car. It was pulled apart for a rebuild. Funny thing is, it was on the dyno and worked fine. This problem reared it's head after 200 miles and has proceeded to get worse (now about 500 miles) [img]<<GRAEMLIN_URL>>/bs.gif[/img]

My suspicion about cam bearings is further supported by the huge oil pressure.