Posted 4/9/2020 14:40 (#8176342 - in reply to #8175797) Subject: RE: 1967 JD 4020 Timing
Mount Vernon, WA
You will not see any difference if you compare the push rods at two different TDCs. On TDC exhaust, they are as good as closed, just like at TDC compression. About the only way you'll know for sure is to watch valve movement while you're turning over the engine.