Gen 4 head casting numbers help

[sanguissaevus]

Im trying to purchase a set of gen 4 heads. I found a guy selling but i want to verify they are gen 4 heads and not some other gen. The heads have some numbers stamped in the casting but i dont know what they mean. They arent the part number. The numbers are

G1161908
025209
G0320800
025038

So, can anyone tell me if these numbers mean anything or could at least tell me any visual cues to identify that they are gen 4 heads or not.

[jasond29]

The intake port and exhaust port shape will tell you what gen they are. Square port intake and d shape exhaust port

[sanguissaevus]

Ok, so from what you said i think i can see it in the intake. The gen 4 pics have a rectangular shape where the gen 3 and gen 2 have a long oval shape. The two shapes are similar but with the gen 4 having sharper radiused corners making it appear more squared off.
As far as the exhaust, the gen 2 pics im looking at have a distinct d shape but the gen 4 ones look less distinct in their d shape. They almost look round with one side slightly flat.

[Chorps]

Pics in this thread should help:

http://driveviper.com/forums/threads/2760-Gen-5-Intake-Install-on-Gen-4-Viper