Getting ready to specify to machine shop operations I require to spec out the 455 block. I need the measurements of the bolt hole, on the left side of the block to insert the pivot bolt for the clutch z bar. I want the option to use 4-speed trans with this engine. I may have read about this previously in the forum, can anyone come up with the location measurements and size? Thanks

 

So you have a 1974 up 455 without the threaded hole for Z bar stud?

 

This is the 455 block I have to work with. Wanting engineering drawing specs for the threaded hole in the left side of the block for the Z bar mounting stud. Thanks for the input and support.

 

You block should already have the provision for the z bar ball stud.... I only see an F...with no a....

 

https://classicoldsmobile.com/forums...o-trans-62401/

this thread has some good pics of the z bar setup

 

Here is a picture of one of the blocks I have here. The hole is 1/2" x 13 thread size. If for some reason your block does not have the hole drilled let me know and I will try to get some measurements for you.