318 LA rebuild after losing a valve seat

nm9stheham said
I answered you PM on the base circle question and valve overlap.

If you are using the same rockers as before, then a length change of 7.500" to 7.125" does not make sense.

They may change a bit with the individual heads, but I cannot think of anything in the 302 heads that is so different that the pushrods should change so much.

The cam might be a bit different in base circle, but really should not be anything like that.

The valve could be waaay too long but that would mean they are basically wrong.

Lifters very different? AMC's?

What am I not thinking of, guys?

Thinking back, I don't think I had the cam at base circle. I'm going to revisit that tomorrow and see what I come up with.

I can't seem to find info online about stock lifter height in the 318 LA engines, only diameter. That said, I don't have my previous lifters to compare the current ones, I only know the new ones were included in the cam kit.

Also, one question I have is if the new pushrod length wouldn't be that different from stock, why would they contact the pistons so soon with so much spring travel left? I'm really hoping I'm not gonna have to cut reliefs.

Wyrmrider said
in fact you have to check and see if your new lifters have the same seat height as your old or stock lifters
all lifter heights changed around 1967 for example and the pushrod ball size changed too

How do I check for, or find, the seat height? I've tried the Lunati website to no avail. Do I just measure down to the pushrod seat?