Head casting numbers

[ktmrider]

Some newbies ( to the 4g63 world ) are playing with 2 different heads. One appears to be from a 2g ( altho sold as a race prepped 1g ), smaller intake ports and a casting number ( on the side by the water neck ) of Y3-8. The 1g/larger port head is stamped 2.0m with another number below that I can't remember.
Anyone have the casting numbers for the different years?!? Thanks for any help.

 

[Siral3x]

It doesn't really matter because the difference between a 1g and a 2g head you can tell and check on the spot. They come with all kinds of casting numbers on all kinds of cars. The only difference are the cams and of course a 1g head or 2g head type.

 

[ktmrider]

, thinking about it I really don't need the numbers. All the research leading up to the discovery is probably fine.
Last question, is there a difference on the turbo vs NA heads or is it only the intake cam?

 

[fourreGsixty3]

Depends on years your asking about.
1990 N/T heads had smaller coolant passages, 1991-1994 N/T & 1990-1994 Turbo heads are all the same except the camshafts.

Also there should be a plug on the NT heads where the oil feed line would be on the turbo'd heads.

As far as 2G N/T & turbo'd heads you might as well be comparing night with day.