https://www.alfabb.com/bb/forums/gta-1965-1975/187462-oil-cooler-adapter-sale-3.html#post1101463GTA Headers might have 3 digits stamped, if I remember on underside of each piece near to header or maybe its near the outlet I just can't remember. GTAj are a different number. I seem to remember a 4 and a 7 in the sequence. Attached a header pic.
Sorry. If i kept better records I could help you.I was reading all "exhaust & header" threads - only finding this:
For sure not, makes no sense in that application. As well as then an 'A' (check out Marcel's link in #1) wouldn't make any sense.I think that the S means more "sinistra" wich is left side and the other side will show a D, I think it means "Destra" wich is right side
Both Numbers the same. This is consistent with what I believe I had as noted in Post #6 above. A set for 1600 and a set for 1300. each set with numbers matching.To add a bit of confusion, I got a second pair of headers, same dimensions as the 2 above. Both marked with A430
It is my understanding that 1750 and 2 litre engines are the same height. 1600 lower and 1300 lower still. The 1600 headers fit and work with a 1750 in the engine bay. Probably the 1600 headers will not clear on a 1300 engine in the engine bay.It's interesting that the famous "GTA" headers were supplied with TI Super, 105.16 part numbers and were catalogued for 1300, 1600, and 1750 engines but--- owing to significant height differences---not for 2 liter engines. This causes me to think that the differences in numbers stamped on the heads might have more to do with the batches being produced than with actual design differences.