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Serial Number Locations

There several numbers associated with each 330 GT. These are the chassis stamp, firewall plate, engine numbers, transmission serial number, differential serial number and the Pininfarina body number.

The main one is the Ferrari chassis serial number. This is stamped into the front member near the mechanical fuel pump. The actual chassis serial number is the 8755 partially covered by the heat shield. The IGM 3835 OM stamping was always a mystery to me until I downloaded the homologation form (from the Ferrari Owner's site) for the 330 GT. IGM is for Ispettorato Generale Motorizzazione Civilie e T. C., which I presume is an Italian government bureau dealing with motor cars. The Certificate for the 330 GT, issued December 28, 1964 is number 3835 OM, thus IGM 3835 OM.
On very late 330 GTs, Ferrari started stamping the chassis number on right side of the front member.
This serial number is also replicated on a plate which is pop-riveted onto the body in the engine compartment. The two locations are on the right hand side of the hood catch and near or on the sheet metal covering the right front shock. The '209' is the motor type, not the motor serial number. Note, this plate is available unstamped, thus may have been replaced on cars of questionable vintage. The stamp on the chassis should also be checked.
The type 209 engine serial number (the same as the chassis number unless the engine has been replaced) is stamped on a machined surface on the right side of the engine below the RH distributor and above and just to the rear of the starter. There is also a 'numero interno' that is stamped above or near the chassis serial number that is the Ferrari internal engine number. You can see both in the picture. The 'numero interno' is the number that Ferrari deems the engine serial number.
The internal engine number on a 330 America is in the same place, but still used the format from the 250 GTE.
There were about 2 dozen engines around S/N 8700 that had a special stamping. The serial number plate had 209/00nn instead of just 209 in the engine space. The block was stamped with that same number where the chassis number was normally stamped. The chassis number was stamped in the V of the most of the blocks near the front cover.
The Pininfarina body or build number is stamped or written on practically all of the body parts. One of the easiest places to look is on the latch part of the hood. The pictures shows '592' stamped on the latch. The nice part about looking here is that it is easily visible when the hood is raised. It's also written on the undersides of the seats, leather and fiberglass parts.
The picture shows the '592' stamped on the door panel while '604' is chalked on the underside of the driver's seat. Some of the parts (side vent pieces) have only the last 2 digits stamped as the area was too small for more. This numbering let Pininfarina keep all of the parts straight for the bodies under construction. Most of the parts were somewhat custom fitted, so having the right parts for each body was paramount.
Here is 592 stamped on the inside of the trunk (boot) lid and just 92 written on the backside of a door panel.
Here is the full PF build number stamped in the floor of the trunk.
The 5 speed type 571 transmission in the late series II 330 GT also has a serial number. The stamped number is very faint (not on a machined surface) directly below the shifter on left side of rear housing. There are several numbers which are cast into the various parts. However, these are part numbers, not specific to a certain transmission.
The 4 speed/OD type 571 transmission in the series I 330 GT has the serial number in about the same location.
The type 575 transmission in the 330 America has the serial number in about the same location.
It is possible to see this from underneath with the transmission installed. By positioning a mirror on an extension handle and looking up to the left and forward by the rubber donut, you can see the numbers (in mirror image of course). This is done best with car on a lift, but can be done on jack stands if you have it high enough to get under it easily. The arrow points to the underside of the place where the number is stamped. The serial number is pictured in the mirror (reverse image of course). I can't believe that this picture actually came out. The flashlight and mirror were being held in one hand with the digital camera in the other. There wasn't enough light for the auto-focus so I had to pre-focus the camera and hope that I didn't move it too much. Not only that, but you can read the numbers, 162/66. Although it does help to look at the picture below.
One can also see (and take a picture) of the transmission number by removing the access plate on the side of the tunnel. You need to remove the driver's seat, pull up the tunnel cover and then remove the access plate.
The type 571 differential serial number is stamped on the left hand side just forward of the filler plug (right side of picture). The number '393-65' is the 393rd differential of this type (1965 revision). The '8 X 34' is the ring and pinion gear ratios.
The series I differential has the serial number in the same place.
The 330 America has the differential serial number at the rear by the drain plug. This can be seen by looking at the differential from under the rear bumper. The ring and pinion gear ratios (not shown) are stamped on the other side of the drain plug.