Author Topic: BBM Lifter Bore Question  (Read 343 times)

0 Members and 1 Guest are viewing this topic.


  • Newbie
  • *
  • Posts: 1
    • View Profile
BBM Lifter Bore Question
« on: August 04, 2020, 11:42:21 PM »
I just measured the lifter bore on my BBM block and I'm coming up with .875 but all the roller lifters like the Morel 5454 have a diameter of .875. I've read clearance should be aprox .0015 so my overall lifter bore should be .8765 correct? Maybe I'm measuring wrong but I tried over and over only to come up with the same measurement. I've looked at Crane roller lifters and they are also .875. Anyone have a suggestion? What am I missing?


  • Hero Member
  • *****
  • Posts: 3503
    • View Profile
    • Lykins Motorsports
Re: BBM Lifter Bore Question
« Reply #1 on: August 05, 2020, 04:42:59 AM »
The clearance will be in the lifters.

A lifter will not measure .875”, it will be smaller than that.  When it’s listed as a .875” lifter, that’s not actual diameter, but what bore size the lifter is for.

As far as getting actual clearance, you will need a mic and a bore mic to accurately measure it. 

Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
Instagram:  brentlykinsmotorsports