Getting my machining done and need to install new call bearings what's better material to go with, babbit or Silicon aluminum (Si)?

My spring pressures are 160/400, 1.7 rockers, 629/612 lift.

Thanks

I would go babbit think its better for dirt

So the general consensus is babbit and not aluminum silicon?

Dart blocks come with babbit. Just use durabond bearings they are probably the best.

Ok durabondbond babbits it is, thanks Apache

I will second the Durabonds. That is all I use.

I just bought/used 2 sets of Durabond myself.

Are you also using durabonds on the rods and mains over clevite or king or are you just using them on can bearings?

Durabond only makes camshaft bearings, not mains and rods. I have had very good luck with Clevite bearings over the years and dont like to change just for the sake of changing I have tried some King bearings lately but they seem to vary a lot as far as thickness goes Interesting since one of their selling points is their "bullseye" tolerance.

Durabond does offer a "coated" option if your going have it sitting for a while with spring pressures on the cam.
Had a cam bearing spin once because of this.