Read that there is an additional oil MOD for my 401 Block.
Incorporates Drilling a new oil passage from main cap to lifter oil passage, mirroring current factory design.
Basically rerouting oil feed to Mains from other side lifter passage.
Purpose of oil from the thrust side of rotation and mains are fed more efficiently from this MOD.
I MFG a sturdy jig brace for drill bit alignment.
Jig for bit has maybe 001-0015" Clarence so this should be sufficient keeping bit aligned..
Any advice or experience in performing this MOD?
thx.