Was the engine built by a third party, is it hyd roller or solid roller, could it have straight 30 viscosity. My go-to guy on cams hated synthetic oil on solid rollers as they 'skid' as the roller enters/leaves the lobe, hydraulics were OK as they maintain contact with the lobe. Rev kit is nice but have to be custom build on SBF. Thats why I asked if you were aware of the need to keep valve lash correct when hot.JacMac, you are completely right, but to run the engine in my garage, at least, I need oil in the engine. Presently the engine is running but the type of oil inside is a mystery and I do not want to spend 60€ to get the info.
Dry sump will be the next step...
Ditto, I have the same block built up by Huddart, he recommended that oil, it's done 30,000 mile on it. He did say with the aluminium block, to warm it up carefully and always get it fully hot before using high revs.Keith Craft swears by Valvoline VR1 20W50. Mine is a similar configuration + dry sump.