Comparing two Crane flat tappet lifters - a solid and a hydraulic, I noticed quite a difference in the height of the pushrod seats. The seat in the solid lifter is way below compared to its hyd counterpart.

Lash on the solid and preload (1/8-1/4 turn) on the hydraulic would still not account for the difference.

If the two are swapped, isnt the rocker arm geometry affected? A solid cam/lifters ought to warrant the use of longer pushrods to compensate for the difference in seat heights? :confused:

Nm,
Some of the solid lifters are taller overall. Take both lifters with two identical pushrods and stand them up on the workbench. Then see if one pushrod is taller than the other.
Yes you are correct, if there is that much difference, it will affect geometry.

BillK,
Performed the 'lifter on the workbench' test and sure enough there is a 0.030" difference. This is after deducting 0.045" for lash and preload.
I guess one cant be too carefull when putting an engine together with aftermarket hipo parts!
Appreciate your response - Thanks!

I switched from a hyd. to solid a while back & the diff. in the height of the seat was .125. The cam I used had a slightly smaller base circle + I was a touch short on the pushrods before, so it all added up that I had to use p/rods the were +.200

77 cruiser,

0.200" is a lot! I will need +0.050" ones because i will be running a tight lash solid.

Thanks!

I hope you didn't take wrong as I was just giving you a for example what I ran across. :cool:

77 cruiser,

I understand that +0.200" is what you needed. In my case, +0.50" will do the trick.

Thanks for the clarification.