Lifter seat height on a Big Block, HELP!

[1968rt]

Anyone know the lifter seat height for hydraulic lifters from lets say 1955 -1970. Im aware that the pushrod cup changed in 68, but what about the seat height? From what I was able to research early seat height was 1.814 (up to 1959) Later seat height 1.795 (up to 1978) Can you interchange early and late? any help would be appreciated.

 

[PRHeads]

The 67 and earlier pushrods, with the 1/4” tip at the lifter end, are longer.
66-67 440 = 9.375”
68-78 440 = 9.315”

The lifters don’t “interchange” with the 68-newer........ unless you swap the lifters and the pushrods.

In other words, the lifters and pushrods must both be for either 67-older, or 68-newer.

 

[1968rt]

I understand I will need the correct pushrod ball size and length. Im just curious to the cup height

 

[1967coronet]

I understand I will need the correct pushrod ball size and length. Im just curious to the cup height[/QUOTE
Take a caliper and measure overall lifter height. then use the bottom of the caliper and measure cup depth then subtract that from the overall figure , should be cup height.

 

[wyrmrider]

given a choice or needing new get the later ones