1600 tall block 681F

Hi all

Does any one knows how much can a tallblock twincam engine rev with a 681F block with its mains but with a 711M cranck and rods?

Will its weaker than 711’s mains stand 7000 rpms well?

Thanks

If the block has round caps, you would be looking at around 6000rpm. If square caps, 6500rpm. It would not be recommended to use those mains at 7000rpm.