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I could be wrong but if I remember correctly the EGR should be closed at idle. I remember when I worked at the dealership diagnosing vehicles with a rough idle by using a screwdriver on the stem to pry open the egr valve and then letting it snap shut. Sometimes this would unstick a stuck valve...

Are you sure it's blocking it off? I can't remember how it is configured. On some chevys a flat plate won't block it off.

Is there an EGR valve on the manifold? If yes is the valve leaking or stuck open? Is there vacuum going to it at idle?

That's cool, thanks for the update. Good luck with your project. Send pictures of your progress.

Do you know if the op has had the motor running yet?

I'm not sure what you mean by clacking and clattering all over the place. Do you mean while he is cranking the motor over for a compression test?

It can be hard to get accurate numbers at full throttle and low rpm on a chassis dyno.

Assuming this is a hydraulic lifter, to see if your intake lifters are bled down. 1. Pull valve covers. 2. Remove spark plugs (makes it easier to turn the motor over by hand) 3. pick a cylinder 4. Turn motor over by hand with breaker bar and socket until the exhaust valve starts to open. 5...

If the lifters are bled down. The wallace calculator says a .030 318 would be between 9 and 8.5:1 to match your cranking compression. If your gauge is accurate.

If the oil is pushed out of the hydraulic lifters by the valve springs (bled down) it might show higher cranking compression.

I should add the chassis dyno is still a very useful tool. Some things it does better than others.

Getting good low rpm data at full throttle with my chassis dyno is difficult at best. Especially with an automatic transmission. My dyno is a eddy brake dyno with smaller rollers (low inertia). My engine dyno does a much better job at this.

I probably missed it but I scrolled through and couldn't find it. Did someone say that they had an engine that lost lash with heat?

There are varibles that can affect lash, hot vs cold. Cast heads vs aluminum heads, cast block vs alum block, aluminum vs steel ball type vs steel roller rockers, stainless valves vs titanium valves, intake valve vs exhaust valve. Etc. For me, I'm not sure it's worth figuring out exactly how...

What did you use to take those port molds? Thank you.

check your math. I came up with .06326 x 20 = 1.2653

I think the amount of time the cam holes are aligned with the camshaft holes are what is relevant. Not when the camshaft holes are aligned with the block holes. Assuming the camshaft bearing and the block holes are aligned. If you increase the cam bearing hole diameter you increase duration or...

Good question. I don't know how you would measure it.

I agree. But I would make the distinction between timing and duration. In your example with the bearings pressed in too far or not far enough this would affect duration. And it could possiblly volume in two different ways. It could affect volume if the misalignment causes a restriction that...

You might be right but i'm not seeing it. Can you explain how it could do that.

I didn’t build the engine or install the bearings. I may not be understanding correctly but if by feed hole you mean the alignment between the block and bearing then I don’t think that would have an effect on the duration or timing but more of an effect on the volume depending on how far off...

I probably wasn't very clear about the hole misalignment longitudinally. If I wasn't hopefully this picture will clear it up. Please excuse the sloppiness.

Offering a possible answer to my own question. Why is the oil duration different on each bank? On the side that has less oil duration, maybe the oil holes were not lined up longitudinally or front to back.

I wonder if the cam cores are drilled before the cam grinders receive them?

I was surprised that the pass side had 12 degrees of oiling and the driver side had 34 degrees of oiling. I'm not sure what caused this and I don't think it will be a problem. Also it's not my motor. When the opportunity presents itself on one of my own motors I will mock the cambearings to the...

I have a 340 on the dyno today and was priming the engine. In the past I have just turned the engine slowly until I hit the position that oiled the rockers for each bank. Today I took time to document where those positions are on this engine. This was a 340 with an erson cam. Does this coincide...

What gaskets are you using to lay out the ports? Thank you.

That's an interesting development. Can you check timing chain slop?

You have a dyno? What brand?

Can you show us your vacuum set up and how it works, please ?