My engine was rebuilt a couple of weeks back and I needed to go back to the original Z20LER block, which is basically a Z20LET. This block doesn't have the oil squirters so I needed to upgrade it but wanted to retain the OE style jets as opposed to drilling through the main bearing journals. With the OE fitment you get a better aim on the base of the piston and also the OE parts contain a small oil pressure valve so they shut themselves down to retain oil pressure at low RPM.
Pics of the mods are here https://www.facebook...pe=3&uploaded=3
If anyone wants this done I can do it for £250+VAT + the squirters (haven't priced these up from Vauxhall yet).