[72LuxuryLeMansLa.]

Originally Posted by Tom Vaught

Bearing can be of the highest quality but if you have insufficient bearing support for the crank weight and rpm, the bearing will overheat and fail. You need a minimum surface area for any given bearing speed to support the firing and inertial loads from the engine.

That being said, a 455 running to only 5500-5800 rpm will have a high success of living a LONG TIME.

Tom Vaught

Tom,

In my specific case I have the following; A .030" over 400 block, obviously a 3" crank journal, Very light rods(700g), pistons are 543g, so my bob weight is 2003g. I'm figuring this engine can live many years on the STREET occasionally hitting 6000rpm using the King MB5526AM and CR815CP bearings.

[PunchT37]

Clevite, P series, full grove, is ok on the non cross drilled 400 factory crank.

1/2 grove on the 3.25 cranks that are cross drilled.

[PunchT37]

A decent read. Check out the discussion further down;

Basically, 180 or 1/2 grooves give better loading without starving the rods.

http://www.vandervell.co.uk/images/s...gPerforman.pdf