[66catalina]

I am trying to put 66 389 rocker arms on my 72 400 heads. I was wondering if this interchange is possible. I thought that all the rocker arms were the same but apparently I was wrong. Is there supposed to be a spacer under the rocker or somthing that I am missing of my 400 heads sot he rocker has somthing to rest on?

[66catalina]

I am trying to put 66 389 rocker arms on my 72 400 heads. I was wondering if this interchange is possible. I thought that all the rocker arms were the same but apparently I was wrong. Is there supposed to be a spacer under the rocker or somthing that I am missing of my 400 heads sot he rocker has somthing to rest on?

[FritzCat]

The rockers are the same, but the pushrods are different. I believe the later heads use longer pushrods.

[b-man]

'61 -'67 (except '67 061, 670, 97 & 997 heads) used the 8.715" pushrod.

'67 and later (except 256/301) used the 9.145" pushrod.

The special Ram Air II/IV/V and early Super Duty engines used various different lengths and diameters.

You need pushrods that match your '72 heads, 9.145".

[Kenth]

1966 389 and 1972 400 rockers are NOT the same!
The 389`s rockers are shorter, as are the push rods.
This is due to different valve angle in the heads.
The rocker is not resting on anything, it´s hold in place by the end of the valve stem and the push rod.

[66catalina]

I did get the later pushrods. I just wasnt sure if the rockers would work.