Quote:
Originally Posted by chiphead
Having one side consistently at 150 and the other side at 190 is not cylinder sealing, usually. Its always possible something went through one side of a motor or the drunk uncle built one side, but that's a weird one-off.
I still say confirm the leakdown then pull the heads.
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Quote:
Originally Posted by Green Elephant
Hey ericwoo, not to pile on with too much information, but if it was me, this would be my plan of attack. Pull the engine, remove heads, have someone cc the chambers, check deck height as suggested below, check compressed head gasket thickness and p/n. Somewhere in there I think you’ll find the culprit for the bank to bank compression disparity.
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Quote:
Originally Posted by Formulas
They also smoke like a forest fire, no mention of smoke being an issue yet.
pressurizing cylinders with shop air with a novice ear and inaccurate tester means relatively nothing, air will escape you will hear it in a healthy engine, .. what matters is an accurate percentage reading then if that is to high you then care if its valves or rings by the audible
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Quote:
Originally Posted by steve25
Once again as I and many others have posted a few times, its high time to pull that head!
Busted rings and broken ring grooves in the Pistons will leave scratchs and even grooves on the cylinder walls
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Quote:
Originally Posted by Green Elephant
I think I saw Jay S mention something about an improperly milled deck height. I’ve seen this before, machine shops do make mistakes. Unless you checked it on assembly, I would check the deck height on both sides when/if you pull the heads. Even if the block wasn’t milled by the machine shop, I would check it anyhow. It’s very easy to do with the heads off and will verify if there is a problem.
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Quote:
Originally Posted by chiphead
Do not pass go, do not waste time on a leakdown, pull both heads and CC the chambers. A leakdown may help confirm condition of bottom end, but I don't think it's the root cause of what's going on here. It would appear that one head got milled and one didn't. Where did these heads come from?
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Hey all, I finally got around to pulling the heads. Sure enough you are all right, they did not mill one side!
At first removal, I did a rough measurement with the calipers on one side of the heads. The driver's side head measured a whole 0.1" taller than the passenger side.
Then I CC'd them. Sure enough the
driver's side head measured about 80 cc and the
passenger measured about 60 cc. What a nightmare trusting others work- this has created a lot more work for me.
Hopefully, others will learn from my mistake by checking machine shops work.
What really bothers me is they advertise their base model D-port heads as being 65 cc. We paid them extra to mill it down further (which one side did get) but I am surprised the other side was significantly higher than 65 cc . Wtf!
Also, the cylinder walls looks very good and smooth, so I am hoping some of the air seeping out is normal. I will start by hiring a machine shop to mill down the driver side to 60 cc also and try running it.
Thank you all! While I am here, should I increase my valve size to 2.11/1.77 ? My current valves put on by Kaufmann are around 2.0/1.66 for my stock 350.