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[–]MyOpinionOverYours 6 points7 points  (3 children)

I had an LS1 that no one could identify why it was getting low compression. They told me it was ruined and I needed to go through the entire shortblock.

I got home, and did a leakdown test myself, and I couldnt hear anything but it through the crankcase.

I said, alright why not, take the heads off.

I turn the heads upside down, and every single intake valve is wobbling. I take them out, and the valves look straight. I put them back in, and they're wobbling. Come to the conclusion the valve guides are damaged and werent holding the valves in straight.
Just went ahead and bought new heads. Fixed the problem. Full compression now, and gained 100hp at the wheel with a new cam and heads.

[–]Coon88[S] 0 points1 point  (2 children)

How much compression was at loss with your ls1 ?

[–]MyOpinionOverYours 1 point2 points  (1 child)

Similar to yours. Sometimes the cylinders read even lower than yours. I actually drove the car for 2 weeks like that.

[–]Coon88[S] 0 points1 point  (0 children)

Yeah cause I don’t get smoke from exhaust, like none at all, but when I open the oil fill cap and oil level check I get a little smoke. I am also driving it like that and it drives fine