Small Block & Big Block Chevy Specific - SBC valve adjustment question.
blown 346
07-11-2008, 01:31 AM
Im putting a motor together and I forgot the method I used to adjust the valves. I used the method like once the exhaust is open adjust the intake, once the intake started to close adjust the exhaust.
The thing is I forgot which valve to start with and when to adjust them. Anyone with help would be great.
ZONES89RS
07-11-2008, 04:53 AM
It would take a while to do them one ata time like that, i usually set mine when the engine is being assembled out of the car and never have to re set again. A for in the car i set them at idle when i was younger, now i make sure the valve is closed, tighten till the play is out and go 1/4 turn further. But i make sure the pushrod can still spin.
1997bird
07-11-2008, 08:10 AM
Im putting a motor together and I forgot the method I used to adjust the valves. I used the method like once the exhaust is open adjust the intake, once the intake started to close adjust the exhaust.
The thing is I forgot which valve to start with and when to adjust them. Anyone with help would be great.
It doesn't matter which cylinder you start with so long as you keep pressure on your pushrods until you don't feel the lifter's moving any more. Then just keep adjusting them as per your initial statement as you bump the starter over. If this is a hydraulic cam I would set my pre-load at a 1/2 to 3/4 turn after zero lash.
blown 346
07-11-2008, 09:32 AM
I figured it out. The motor is out of the car being assembled so it was easier. It is a hydraulic cam, I did the 3/4 turn then locked them down.
G&HRacing
07-11-2008, 09:35 PM
For a hydraulic cam I never pre-load more than 1/4 turn, they seem to run better that way.
1997bird
07-13-2008, 03:14 AM
For a hydraulic cam I never pre-load more than 1/4 turn, they seem to run better that way.
For me it has been the opposite, at bolth the track and on the dyno.
blown 346
07-13-2008, 04:16 AM
I did my other motor that had a hydraulic cam the same I did above with no problems.
My machinest had first told me to do the 3/4 turn, then I looked it up and it told me the same thing.