What type of bearings to use?

[brainsboy]

You should not use H-series bearings unless you have too.


To understand why you have to understand the differences in bearings. Bearings are not round, they have eccentric walls, meaning that the thickest part is in the middle, from there the bearing tapers off smaller in each direction. Depending on the type of motor you have you will need different bearings. All clevite bearings are a tri metal design the difference is in the amount of taper or oval which is called eccentricity. The clevite regular bearings start with a part number "p". Dont confuse these with there race bearing the "P series". The P series has the greatest amount of eccentricity and have a high crush and overlay so that they last longer under higher loads. For performance and longevity this is your best choice in most street/strip cars. The H series has a medium eccentricity. These were originaly designed for nascar but used in most other racing now. H series also have a larger chamfer so they clear the crankshaft fillets. These are your best choice if you plan on runing alot of high rpms, or your only choice using some aftermarket crankshafts due to side clearance.

All these bearings will fit and for the most part work fine. The difference can not be seen by the eye, so it leads to alot of debating on which is the best. I would say your best choice in your situation would be for a Clevite P series. Im not sure why one person said there is a big difference between H & P as both will measure the same in the center and the taper is only .0005 difference between them. The P series is one of there oldest series and still used in millions of cars.