Half groove main bearings for 400?

[64SF]

I've done a lot of looking without much success. Are 1/2 or 3/4 groove main bearings available for a 383/400 crankshaft. If so can anyone provide a supplier or part number. Thanks.

 

[lewtot184]

half groove main bearings should be the standard factory bearing. never known of a passenger car 383-400 to come from the factory with full or 3/4 groove bearings.

 

[Garys1969RR]

I think the only fully grooved main bearings were for a Hemi. This supplied oil to the rod journals all the time, rather than every half turn of the crankshaft. And I think these fully grooved main bearings could also be used in a 440.

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Now looking at Summit, all the main bearings for a 400 are fully grooved.

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Maybe the half groove ones are no longer available? I'm pretty sure they were standard on the factory 383s in the late 60s.

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Check out the MS 2324 P mains by Clevite. In the description it says grooved, the pics show a half groove, but further description says upper and lower halves are grooved. I believe the fully grooved are better.

 

[lewtot184]

half groove was factory stock.

 

[miller]

Don't know if it's true, but what I ran into looking for Clevites for my 440, half groove bearings were not available anymore.
Either no groove, or full groove only! Only way, I was told, was to buy BOTH sets, mix and match. Said the heck with it, and went full groove.