What should lifter to bore clearance be on solid roller lifter in sbc
Its a shp block crower lifters
Thanks benno

Make sure you measure every lifter and I like .0014 to .0019. Crower lifters for some unknown reason run to small for a GM .844 bore.

 

Non bushed? .002”-.0025” per Crower. .0018-.0022” on a bushing IMO.

 

.0025 There is way to much bleed off. Funny Crower told .0015 to .002

I guess it depends who you talk to at Crower..........


I have seen lifters with a lot of wear do to much bore clearance.

 

Page 5

https://www.crower.com/media/pdf/RollerLifterGuide.pdf

Too tight and axle feed and top end oiling suffer.

 

if the axle oiling hole is edm from the oil band to the axle, the bore clearance wont matter, as the band has full supply.
as for top oiling, we put a .015-.020 or so deep nick from the band to the oil hole to provide oil to the pushrod/rocker
we typically set up at .0017-.0018 on new bores/lifters in an iron block, and with the lifter modified, i have never had issues
with alum, i will set up .0002 or so tighter


I feel this gives us the best control of oil spilling out of the lifter bores, and also provides plenty of oil for the pushrod/rocker



We also oil the lifter galleys from both ends of the block, with .063 restrictors in the 4 corners


We have recently been switching to a full body style lifter without the band for support, and we mod those as well to provide oiling.



YMMV and all that..lol. This is just what has worked for us

 

if the axle oiling hole is edm from the oil band to the axle, the bore clearance wont matter, as the band has full supply.
as for top oiling, we put a .015-.020 or so deep nick from the band to the oil hole to provide oil to the pushrod/rocker
we typically set up at .0017-.0018 on new bores/lifters in an iron block, and with the lifter modified, i have never had issues
with alum, i will set up .0002 or so tighter


I feel this gives us the best control of oil spilling out of the lifter bores, and also provides plenty of oil for the pushrod/rocker



We also oil the lifter galleys from both ends of the block, with .063 restrictors in the 4 corners


We have recently been switching to a full body style lifter without the band for support, and we mod those as well to provide oiling.



YMMV and all that..lol. This is just what has worked for us

As you can tell there are a lot of people that don't pay attention to oil control as you can see in the video. Also people using cam bearings with 3 holes in another huge bleed off.

 

Does this offer anyone insight on lifter bore oiling?


Video 1
———————
https://www.facebook.com/cedarmachine/videos/568562246913331?sfns=mo

Video 2
——————
https://www.facebook.com/cedarmachine/videos/302173940386740?sfns=mo

 

Interesting video. I too have a 55mm cam core in a BBC with .904 lifters and no bushings. The only problem I have had to date with oiling is too much oil up top sucking the pan dry and uncovering the pickup on decel at the end of the track.

 

Dumb question......If you close off the openings above the cam so there is no oil splash on the cam/lifters/crank/rods and you modified the back of the manifold and put a scavenge tube close to the valley and pulled vacumn with the dry sump would that be beneficial or take away to much oiling?

 

I do it all the time...