Are you running an aluminum block hemi? if not a waste of time..Hello.
Want to replace main bearings in 4.0 engine.
The aluminum ones are cheaper and the write-up
describing them sounds okay.
Does anyone have any first hand experience with these
aluminum engine bearings?
Thanks for your time
I don't understand why aluminum bearings would be used even with an aluminum block since the crank and thus the crank's bearing surface is steel. But then what I know about rod bearings is less than what I know about brain surgery lol.Similar flex and expansion. Aluminum bearings in an iron block, the aluminum expands and tightens up the clearances up to the point of possibly seizing the engine.
Thanks much.There is some misconceptions in this thread.
Bearings are typically either tri-metal using traditional copper lead and babbit construction, or bi-metal using aluminum alloy with tin and silicon.
For my stroker build I installed King aluminum alloy bearings. They have a more consistent surface thickness, resist seizure during brief oil film collapse, good particulate imbedibility, and longer service life. For the cam bearings I used DuraBond.
If you are not rebuilding the engine, or at least resizing/resurfacing the journals, you can't just slap in some new bearings and expect it to work. The factory mixes and matches slight undersized/oversized bearings to account for machining tolerances at the plant. You will do more harm than good if you just replace the bearings without checking the oil clearances.