valve lashing help
Thread Starter
On The Tree
Joined: Feb 2007
Posts: 128
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valve lashing help dz 302 all stock expect for compression it has been dropped to 9.5 to 1. The main question is with valve lash. everything says it should be .26 cold. however vacuum at idle with this is 6ish and compression gauge reading is 125ish. now if i open up a bit to .35 vacuum jumps to 10-11 and compression to 150ish. is there any issues with running .35 vs .26?
Teching In
Joined: Mar 2013
Posts: 32
Likes: 1
From: Upstate NY
Low cranking pressure due to cam valve events not matching compression ratio. IVC is too late for 9.5:1 to perform well overall. To be blunt, you can't polish a turd. This is one of the reasons why cam companies have a minimum suggested compression ratio. When you increased the valve lash, the intake valve closed earlier, thus raising the cranking pressure.
