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<blockquote data-quote="corvairbob" data-source="post: 16522" data-attributes="member: 5236"><p>thanks that is what others have said. i found the piston's oil drains were blocked so i drilled them the next size bigger and i added 2 more holes also the oil ring expanders were all plugged as well. i just do not understand those jets as my corvair runs at 325 deg and lays flat and when i tore it down 15 years or so ago the oil rings were perfect. i tore that engine down due to piston slap from preignition that most had.&nbsp; and those engines had the same compression as the ecotec. but not fuel injection. anyway, i will leave it alone and if i have to tear it down again you can bet those will go away. one thing that i also figure some new engineer came up with is that pvc being a jet and not the valve. my corvair has the same thine and back 50 years ago gm found out that that technology did not work and went away with it. and i see the 2018 ecotec engine now went back to pvc valves. thanks</p></blockquote><p></p>

[QUOTE="corvairbob, post: 16522, member: 5236"] thanks that is what others have said. i found the piston's oil drains were blocked so i drilled them the next size bigger and i added 2 more holes also the oil ring expanders were all plugged as well. i just do not understand those jets as my corvair runs at 325 deg and lays flat and when i tore it down 15 years or so ago the oil rings were perfect. i tore that engine down due to piston slap from preignition that most had. and those engines had the same compression as the ecotec. but not fuel injection. anyway, i will leave it alone and if i have to tear it down again you can bet those will go away. one thing that i also figure some new engineer came up with is that pvc being a jet and not the valve. my corvair has the same thine and back 50 years ago gm found out that that technology did not work and went away with it. and i see the 2018 ecotec engine now went back to pvc valves. thanks [/QUOTE]

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