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Old 06-20-2021, 02:29 PM
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TCSGTO TCSGTO is offline
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Join Date: Dec 2000
Location: Warren,Ohio,USA
Posts: 1,677
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I wouldn’t worry about the actual compression test numbers. Yours are consistent across the board and look good.
I still vote for oil coming from up top not the rings. Many more times than not oil smoke at idle is getting sucked into the chamber through a seal/guide or PCV, not pushed in from the piston. If it was smoking under heavy throttle then I’d suspect a ring/cylinder issues.
Will your camera reach down the intake runner and see the valve head? If so check for oil deposits on the stem and head. You may see raw oil in the cylinder head port too if it’s running down the valve.

__________________
68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH

New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html
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