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PostPosted: Tue Oct 02, 2018 6:21 am 
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This is my first 351c build. I have built a couple of SB and BB Chevy's with solid lift cams. Is the principle the same with using feeler gauges to adjust lash?? What about for a hydraulic cam, slight turn of the push rods with your finger and then qtr turn more?

Thanks
Wade


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PostPosted: Tue Oct 02, 2018 6:32 am 
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Don't rely on how the pushrods turn. Rely on if there's lash or not.

For a hydraulic camshaft adjustment:

Set your focus on one cylinder, i.e. #1. Rotate the engine over until the #1 exhaust valve starts to open. Adjust the rocker arm adjuster on #1 intake valve until you feel no more axial play (lash) in the pushrod. When you get to that point, add 1/2 turn of preload and lock the polylock down. Rotate engine over until intake valve starts to close. Adjust the rocker arm adjuster on the #1 exhaust valve until you feel no more axial play in the pushrod. Add 1/2 turn of preload and lock it down.

Go to next cylinder.

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PostPosted: Tue Oct 02, 2018 6:38 am 
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blykins wrote:
Don't rely on how the pushrods turn. Rely on if there's lash or not.

For a hydraulic camshaft adjustment:

Set your focus on one cylinder, i.e. #1. Rotate the engine over until the #1 exhaust valve starts to open. Adjust the rocker arm adjuster on #1 intake valve until you feel no more axial play (lash) in the pushrod. When you get to that point, add 1/2 turn of preload and lock the polylock down. Rotate engine over until intake valve starts to close. Adjust the rocker arm adjuster on the #1 exhaust valve until you feel no more axial play in the pushrod. Add 1/2 turn of preload and lock it down.

Go to next cylinder.



Thanks Brent! So solid lift cams would use feeler gauges with the same valve sequence opening\closing?

Wade


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PostPosted: Tue Oct 02, 2018 6:39 am 
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Yes, instead of preload, you have lash.

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PostPosted: Wed Oct 03, 2018 2:06 pm 
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X2 on the solid lifters. I work for a solid even resistance when pulling out the feeler. When you don't do it a lot, it takes some time and do-overs to get it right.

On the hydros, I use the finger spin and it's worked fine for me over the last 40 years or so. I use a light touch and I can easily tell zero lash. 1/32 of a turn (random choice) is around .001 which with hydros is a whatever in my personal book. But do use the "EOIC" method in any case. (Exhaust Opening - set intake, Intake Closing - set exhaust)

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