Never had the spring thing ...if i put it on it takes extra effort to push the catch back. Catch works perfectly fine without it. I removed, cleaned and rewelded in place the heavy channel that is the stop for the catch on the backside of the radiator support just in case.
You guys that have it find it's ok?
Original 1964 Borgo pistons with ~200k miles worn only in one location, the top ring groove being 0.010" over. Shame. Ring gap was at limit of 40 thou. Original Alfa rings with about 120k on them did not significantly wear the cylinders, under the microscope the wear pattern looked good to me.
So waiting to hear back from vendors....want a street, stock 1600 67 spec Duetto engine. JE pistons available but for race apps.
Meantime I cleaned the block and crank, crank in spec so it'll just get new std bearings. Goetze bearings available here so I'll probably go with those. Is Clevite better ???
Studs a little crusty but I leave them alone. Made sure the cylinder seats are super clean as wall as the bores.
Parts arrived 3 days after ordered from CLassic A, Federalmogul just about everthing, from piston/cyl assemblies to bearings.
Mixed heavy wrist pins with light pistons, plus a little material removal got the weights to within 0.24g of each other. I'll weigh the old assemblies just out of curiosity.
Did that to my Peugeot engine and it really smoothed out the engine past 4k rpm.
Piston/cyl set from Nüral have a 3.5mm oil groove rather than 4mm of the old Borgo OE
So I ordered Hastings rings from Summit. The top ring is moly coated in the set for 3.5mm oil ring groove. Chrome top ring sets are for 4mm oil ring groove. Don't know why.
Pistons with in 4g of each other, matched their weights including the wrist pin so that max difference is now 0.24g
Disassembly of head shows perfect intake seats but the exhaust though pitted will clean up after some hand lapping, as test on #4 showed.
All the valve train parts are identified and in sealed baggies. Intake seals were rock hard but guides might be ok. Will measure today and do the dry vs oiled wiggle test on the valves. The head while it has many years (30?) since it was last off for valves, springs and guides it has maybe 30k miles on it. Rings and bearings have around 120k .
Here are pictures of the lower part of the studs. Yeah they have pits but thats the way it's been. I descaled , sanded, naval jelly, primed and painted to slow or stop further corrosion. I don't think the studs are as stressed in the 1600 as say a 911, which snap oe Dilivar studs often but they are smaller ( i think, iirc) ....ive had to do the job. Really don't want to take it to a machine shop.
If you had an experienced Alfa engine builder locally I think it would be worthwhile to have him/her take a look at those. We just rebuilt a friend's 1750 and rejected the first block for this reason. Hard to tell in pics but they look pretty eaten.