128 coupe / X1/9 1300 (75hp) 24/68 64/28 lift at the valve (no play) 9.75mm for intake / exhaust (Fiat part number 4331512)
X1/9 1500 carburettor (85cv) 24/68 64 28 lift at the valve (no play) 9.85 inlet 9.90 exhaust (Fiat part number 4333059)
and just to be thorough, the specs for the later euro 1300 (73hp) which is a 12/52 9.2 cam (Fiat part number 4358713)
now the two interesting things to note are,
1. all these cams have a 28mm base circle, but the two 24/68 cams total lift can't be measured by putting a caliper across the base and then across the nose... as the cams lift ramp begins before the mid way point (spec U) as this is already 28.35mm ... (so 0.175mm of lift at this point) ... unlike the 12/52 cam where the base circle true value can be measure (U is 28.00mm)
2. the euro 1500 cam is 9.85mm lift on the intake, and 9.90mm lift on the exhaust... recently I aquired a copy of the factory specs and features manual for the 1500 euro carb 5 speed X19 and that concurs with the FIA documents.
1500 euro x19 five speed cam specs page from 'data and charecteristics 9/78'
128 rally cam specs 'caratteristiche e dati 1/72'
128 sport coupe cam specs ' caratteristiche e data 11/71'
here's a scan of the Fiat part numbers you DONT want...these are the part numbers and supercessions for the basic run of the mill 128 1116cc sedan. (12/52 and 9.1 and later 9.2mm of valve lift)
4221372 is the original part number for a 128 1116cc sedan, 12/52 9.1mm.
it superceeds to a 4332961, which is 9.2mm lift and the same duration.
this the superceeds to a 4358713 which is the same... there are ebay sellers who are trying to pass off this part number as a 'euro x19 cam' as it was in the 1975/78 euro 1300, but it's a 12/52 9.2mm cam, not a 24/68 64/28 9.75mm intake (1300) or 9.85mm intake (1500) X19 cam, so 'buyer beware'
The 128 Sport coupe 1100 (just to confuse the issue) uses a cam with 9.75 lift, but is 12/52 duration... I don't have that part numbers to hand but basically caveat emptor if you shop for a cam based on lift alone.
SteveC