Did a little more work today. Not much. Mostly just getting the roller rockers situated on the head again I took a few pics of them before they get hidden under the valve cover again. It's a set of KgTrimning roller rockers, with an aluminum bridge in place of the 4 little pedestals the stock rockers sit on.
First, a shot of the olde stock rockers, don't mind the dust.
Does the shaft flex under the loads of high lift cams, double valve springs, high rpms? Dunno. But the KGTrimning bridge supposedly supports the shaft on all sides of the rockers, and prevents flex and vibration.
I took a few measurements. The rocker shaft seems to be the same diameter (.855") between the stock and KGTrimning shaft. I think the KGTrimning catalog says the shaft was modified somehow, my Svenska reading isn't really good enough to decipher it.
I measured the height that the shaft sits above the top of the head. The stock pedestals are 1.04" tall. The bridge is .92" tall. In theory, this is good for higher lift cams, lowering the shaft puts a more equal amount of angulation on either side of level for the rocker. Otherwise, all the added lift on a high lift cam would come via the rocker going farther past horizontal (assuming same base circle). Which wouldn't be good.
Some pics of the rockers. They're in pairs, with subtly offset rollers for the valves, and adjusters for the pushrods. Are these custom ordered like that? Or was it very craftily ordered as a sort of stock-ish part from something mainstream and domestic? Dunno. There are a variety of shaft mounted rockers from domestic cars. Even some shaft mount conversions for engines that normally have stud mounted rockers. There's no clue on the rockers where they came from, no part numbers, no company names.
The bridge sits directly against the head, and reaches out to the valve cover mounting surface. Which means it needs to seal without a gasket. So smear on some Indian Head Shellac (I seem to have better luck with that than silicone), setting it in place, and positioning it with bolts. I also glued my rubber valve cover gasket to the bridge, I'll leave the top of that dry against the valve cover itself. I nestled the valve cover on to hold it all in place as the shellac dries.
I might use the 'VOLVO' valve cover this time. I've had the no logo post Volvo warning IPD cover for a while, because it seats the valve cover gasket a little better. But my older Volvo logoed cover is cooooooler.