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Old 09-07-2011, 08:39 AM
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Loose rockers, valve adjustment

Hey all. Little back story. SBC400, aluminum heads (no brand), hydralic lifters, rockers say "1.6" on them. Motor was torn down when I bought it, and the previous owner had bought everything "to match perfectly." Well after the cam being too big for the converter and the Demon carb being way off... I don't trust the guys judgement.

When getting it altogether, I originally adjusted the valves as I read and watched in the videos; no lash, 1/2 turn, then tighten the locks. The motor never ran with this. Tried 1/4, 1/2, and a full turn on them after 0 lash. The motor just sounds like it's choking and never fires up. So I loosened everything up, and it ran fine.

Since everything else on the car has been doing fine, I decided to go back and adjust the valves. You can hear them clanking a little and it's just loud coming from the engine. So this week I adjusted them the same way again, and the motor did the same. I loosened them up, where basically the rollers are barely tight, and it runs fine. But it's loud again.

I was thinking, do you think the pushrods might be the wrong length? If you need more info, I can get what you need. Thanks!

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Old 09-07-2011, 09:21 AM
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I never adjust the valves with the engine off, I always adjust them with it running and why is because I can hear the changes as they occur while adjusting them. It almost sounds like your cam is a solid lifter cam as it seems to be so sensitive when you adjust the valves the recommended way the valves are staying open so the engine won`t start. However, I`m not sure how they show to do so on a video, but there`s plenty of guys on here who know how to adjust them with it not running and has more experience than I do with roller rockers.
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Old 09-07-2011, 09:48 AM
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. I have hyd roller with the same problems .
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Old 09-07-2011, 10:06 AM
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Cam is Erson Cam E110822 282.0 / 290.0 if anyone needs that. No clue what lifters are in there. They were unboxed and presoaking when I bought her.

I've tried adjusting while the engine is running, but haven't like doing that at all and never get any positive results.
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Old 09-07-2011, 10:48 AM
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http://www.osorracing.com/cams/Chevy...SB_280-295.htm

This is a solid lifter cam...just scroll down til you find e110822.
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Old 09-07-2011, 11:01 AM
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Quote:
Originally Posted by Adam65
http://www.osorracing.com/cams/Chevy...SB_280-295.htm

This is a solid lifter cam...just scroll down til you find e110822.
I was just seeing this actually. Thanks.
Just watched a vid on youtube on using the feeling gauge to get the spacing between the roller and valve top. The question is, what should that spacing be? Is that 0.510 for intake/exhaust? Or is that a different number?

Thanks!
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Old 09-07-2011, 11:30 AM
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.510 is the lift for intake & exhaust (probably using 1.5 rockers). Don't have a clue on the lash. Try calling PBM (that's who makes erson cams now) and see if someone there can help get a lash setting. They may even still make this same cam under a new number.
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Old 09-07-2011, 02:31 PM
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Solid lifter cams just tick, get used to it. It's like the difference between stock and glass pack mufflers. Be glad it's not a solid 30/30 !
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Old 09-07-2011, 03:09 PM
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Quote:
Originally Posted by Adam65
.510 is the lift for intake & exhaust (probably using 1.5 rockers). Don't have a clue on the lash. Try calling PBM (that's who makes erson cams now) and see if someone there can help get a lash setting. They may even still make this same cam under a new number.
Ok thanks. I didn't get to calling them or anything but will try it at .020 to start off with. From researching, that's a good starting point. Then I'll see how it goes from there.
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Old 09-08-2011, 07:34 AM
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Just a follow up... I made the adjustments with 0.020 lash while cold and wow. Car has never started up on the first crank when cold. It literally start right up, no questions asked and ran perfectly. It sounds so much better out the exhaust and smoother. Took for a spin and she's never had as much power. So that was definitly the problem... and I def have solids.

Thanks everyone.
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Old 09-08-2011, 08:22 AM
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A little tip for longevity, get a can of zinc additive or run Valvoline VR-1 with ZDDP. It'll keep it running longer with less wear designed for flat tappet cams.
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Old 09-08-2011, 10:52 AM
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If he fired it up w/out break-in lube in the cam & lifters & w/out additive in the oil & did not go thru a proper break -in procedure, more than likely, the damage is done!!

dave
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Old 09-08-2011, 10:59 AM
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Quote:
Originally Posted by 2old2fast
If he fired it up w/out break-in lube in the cam & lifters & w/out additive in the oil & did not go thru a proper break -in procedure, more than likely, the damage is done!!

dave
Car has been running for months, and been long broken in with the 'loose' rockers.
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