Burnt up rockers on sbc

[weq92f]

If nobody else chimes in regarding your current set of lifters and/or the video of the lifter valley, I suggest you replace them all with comp's recommended lifters for your cam. I would also replace the rockers since they were not getting oil. A failure of the bearings there would send metal into your block/oil ( potentially ).

I know you don't need this advice, but future readers may:
When installing the lifters, follow the directions to the tee, if no directions, go to the website of the manufacturer and download or read them from there. If no directions, return them and buy from a manufacturer that provides instructions for you to clean the hardware and soak in oil before installation.

Regarding the lifter valley video: I see oil rising up from inside the bores so the oil galley is pressurized. What I don't know is whether that's the right amount of pressure...enough to make it into the lifters...assuming the lifters are functioning and aligned properly when riding on this cam.

Hth,

-klb

[homemade87]

Originally Posted by Rednek13x

Pulled a lifter out took some pictures

The upper lifter has the reliefs and the orifice for the lifter should be fine . But still no oil . Could very well be the lower part of the lifter with the roller and the base circle of the cam may not be dropping down in the lifter bore enough to expose the center of the lifter to the galley bore .

[mattfranklin]

Originally Posted by truckdude239

There is an oil gally plug under tbe reear main cap was it installed? Are the push roods have holes in them? My 350 i had had oil squirtkng out of the rockers and making a mess every where

Yes. Great point. Not a ton of information out there on that one. The few machinists I've spoken to say that they don't normally take out because there isn't too much junk behind it. But I took mine out before I spoke with them and had to track down the part number and the instructions to install it. I carefully put mine in and have good flow through all push-rods.

[mattfranklin]

Originally Posted by mattfranklin

Yes. Great point. Not a ton of information out there on that one. The few machinists I've spoken to say that they don't normally take out because there isn't too much junk behind it. But I took mine out before I spoke with them and had to track down the part number and the instructions to install it. I carefully put mine in and have good flow through all push-rods.

The internet keeps getting better every year.

Here is a link to what TruckDude and I were talking about:
https://www.crankshaftcoalition.com/...ystem_Chevy_V8

And the pic:
https://www.crankshaftcoalition.com/...ear_main_2.jpg

EDIT: BTW, this is a $1 part. But they might charge you $5 for it. :-) Talk to your machinist first. See if they are familiar with the plug and how confident they are that they put it back in. And see what they say about your symptoms.

[Rednek13x]

GOOD info, I just checked and I get a depth of 8 3/8” from top.

[Rednek13x]

Here’s another video showing oil flow coming out the #8 exhaust lifter bore. First one closest to the distributor. https://youtu.be/MAv045q55PM

I went ahead and ordered new comp lifters and some full roller rockers. I will give that a try.

[weq92f]

Sweet! Your oil is being a) pumped through the filter ( wink wink ) and b) nicely pushed with pressure into the lifter oiling galley there!

You'll be cooking with gas again shortly

-klb

[mattfranklin]

Glad the plug wasn't missing. So we've eliminated that.

Still scratching my head. Next thought: Comp says their roller-tip rockers have a 350lb max.

See p 314.
http://www.compcams.com/catalog/comp...12_312-327.pdf

The 372lb spring pressure was your "full open" pressure, right? Could your extra 22lb make the difference? <10% Maybe if it's already at the limit.

So some oil makes it to the rockers, right? It's just not as much as I'm used to seeing with stock type lifters. Could it be that your lifters assume that you're using full roller rockers?

[mattfranklin]

Again, scratching my head, but how's the pushrod length? I assume you compensated for the taller roller lifters with shorter pushrods. But if the geometry is way off the oil holes in the pushrod won't line up with those in the rocker. Still scratching my head.

[Rednek13x]

I ended up needing .100 shorter pushrods with the roller tips. Yes hydro roller lifters. I ordered up comp lifters and some full roller rockers. I’ll double check pushrods length when they show up, get the correct pushrods and try it all again to see what we got.

How does the oil flow out of the #8 lifter bore look? Ever do that before?

[mattfranklin]

I did some more reading because I've never had rollers myself.
According to Comp, many brands of roller lifters need a certain index to align properly with lifter oil gallery for Chrysler anyway -- Comp says their lifters are machined so it doesn't matter. For Chrysler. I didn't dig far enough yet to figure out issues for Chevy

Have not primed before with lifters out before.

Good luck with this. We're interested in seeing it run strong. Oh, and Go Gophers! and SKOL, Vikings! (I'm a MN native living out in CA these past 20 years).

[68Gold/white]

An engine builder acquaintance of mine has had issues with these specific rockers.

His take on the deal is that the slot in the rocker balls allow the oil to just run out bottom of rocker too fast. He has replaced slotted balls with solid balls. When he has done such, he uses lapping compound between rocker body and solid ball. fairly easy to do, easy to clean lapping compound off after. This has been a fix, for him. Mind you these are ALL customer engines. He refuses to use these rockers on any engine. He advises to only use them on a stock or close to stock build....