Problem with lash closing up

ss3011 · 03-05-2020, 04:48 PM

Probably should have said right from the start that this is a stocker engine with a flat tappet cam . Today we pulled the intake and examined each lifter and cam lobes . This is the second year on these parts and they still look brand new . It has cast iron heads , and the valve seats are not replaced , they are just machined into the casting . This year the valve job still looked OK so the valves were lapped and re-installed . Springs were not replaced and are still at 200 on the seat just like when it was reassembled . Engine has about 10 pulls since re-assembled . These are good parts , Trend lifters DLC coated , Steel cam , PAC springs .

The next step I think will be to try and measure the length of each valve , and see if Cylinder 4 valves are .003 longer than the others . I would think when the original valve job was done , all the valve lengths should have been ground to the identical length .

Thanks for all the ideas , it helps .

03-05-2020, 04:48 PM	#14
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Problem with lash closing up Probably should have said right from the start that this is a stocker engine with a flat tappet cam . Today we pulled the intake and examined each lifter and cam lobes . This is the second year on these parts and they still look brand new . It has cast iron heads , and the valve seats are not replaced , they are just machined into the casting . This year the valve job still looked OK so the valves were lapped and re-installed . Springs were not replaced and are still at 200 on the seat just like when it was reassembled . Engine has about 10 pulls since re-assembled . These are good parts , Trend lifters DLC coated , Steel cam , PAC springs . The next step I think will be to try and measure the length of each valve , and see if Cylinder 4 valves are .003 longer than the others . I would think when the original valve job was done , all the valve lengths should have been ground to the identical length . Thanks for all the ideas , it helps .