What The Head Is Going On Here?

[apexnow]

I am new to the Celica scene. I am a converted Prelude owner.

I have three 86-87 Celica GT-S's. One of the motors what suppose to be some sort of high performance setup with a non-standard head on it. It has markings of "11111-88360 Yamaha" on the front above the exhaust ports. All of my other GT-S heads do not have this marking.

Yesterday I bought another car and it had this same marking on it. So I am confused. I know that Yamaha has partnered with Toyota for many years so I am not surprised to learn that Yamaha built Toyota's heads but I am not sure why some of the heads have this marking and some don't.

What do these markings mean? What is the difference, if any. Thanks for any help.

[Gino Merlot]

Originally Posted by apexnow

I am new to the Celica scene. I am a converted Prelude owner.

I have three 86-87 Celica GT-S's. One of the motors what suppose to be some sort of high performance setup with a non-standard head on it. It has markings of "11111-88360 Yamaha" on the front above the exhaust ports. All of my other GT-S heads do not have this marking.

Yesterday I bought another car and it had this same marking on it. So I am confused. I know that Yamaha has partnered with Toyota for many years so I am not surprised to learn that Yamaha built Toyota's heads but I am not sure why some of the heads have this marking and some don't.

What do these markings mean? What is the difference, if any. Thanks for any help.

Hey apexnow,
There is a big difference on the heads. on the the 3s-gte motors,yamaha built those heads,and they are wider than 75 degrees for more air flow. Its a racing head for the 3s-gte motors. Yamaha also designed the head for the 2zz-ge motor in the 7th gen Celica's as well.
Toyota designed the heads on the other engines such as the 3s-fe motor,and 5s-fe motor.
The difference is,G stands for wide angle head wider than 75 degrees,and the f stands for Fuel Economy,a head less than 75 degrees. I hope that helps you out

[apexnow]

Thanks for the response.

I follow what you are saying but I thought the F heads came on the Celica ST & GT models and the G heads came on the Celica GT-S models. (I am only talking years 86-89) All of the motors I have came out of GT-S cars and all say 3S-GE on the emissions sticker.

[Rick89GTS]

Originally Posted by apexnow

Thanks for the response.

I follow what you are saying but I thought the F heads came on the Celica ST & GT models and the G heads came on the Celica GT-S models. (I am only talking years 86-89) All of the motors I have came out of GT-S cars and all say 3S-GE on the emissions sticker.

You are correct, so are you saying some 3SGE heads are stamped while others are not?
If so, I wouldn't worry too much about it. AFAIK, the 3SGE heads were all made by Yamaha and if you have some unstamped, it was probably just a production decision.

Here is a link to the head angles, etc:

Toyota Celica Online: head differences

[apexnow]

I had a local mechanic tell me he believes the 11111-88360 Yamaha heads are probably JDM motors and the non stamped are USDM. He is checking a reference to confirm that.

I am not worried, I just want to be knowledgeable about my cars and want to be able to have an answer for those that may accuse me of using a cheater engine at the track.

[Rick89GTS]

Cool, let us know, I'd like a definitive answer on that too.
I took a quick look at my Canadian head and it's non-marked.

[kiasis]

Whether or not it's a USDM/JDM thing, I don't know; however, I can confirm that you have the correct stock head for the 3SGE engine.