pistons/valves have to be in a certain position to check zero lash?
03-22-2014, 07:12 AM
#1
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pistons/valves have to be in a certain position to check zero lash? ok I searched and searched, im doing heads cam swap and im going to use a checker, I know how to do everything but one thing.
does it matter what position the pistons or valves are in when I start the process??? TDC, valves closed???
does it matter what position the pistons or valves are in when I start the process??? TDC, valves closed???
03-22-2014, 07:27 AM
#2
Yes it matters. Ideally, the piston will be at TDC on the compression stroke - both valves closed. You can also check the intake valve when the exhaust valve is early in its opening cycle; and you can check the exhaust valve when the intake valve is open, but closing.
https://ls1tech.com/forums/18078367-post1.html
https://ls1tech.com/forums/18078367-post1.html
03-22-2014, 10:45 PM
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Darkmans response is very important, i believe the spec on the rockers are 18 or 20 ft lbs and if you torque them with a valve open you're working against 100+ lbs of valve spring and wont even be torqued to the head, when the valve closes there will be excessive rocker slop