Hello, I Have a 1986 Trans Am and i can not figure out what size engine is in it??? It says " Ac Delco Model 12465197 Made in Mexico remanafactured for general Motors" i was told it is a 350 out of a wrecked Iroc but? can anybody help! Thanks so much! i can not find info anywhere yet and have been looking everywhere. thanks

 

If it has "Hecho en Mexico" cast behind the left head, on top of the bellhousing flange, then it's probably a basic "Goodwrench" 350 that's now on it's second life, as a crappy 355 with cast dished pistons, 76cc heads, tiny cam, and such.

 

Thanks for the reply!, I put valve cover gaskets on it today and found out the 1986 gaskets did not fit - it has different heads on it i guess, it has the center 4 bolt torx bit style that is used from 87' to 02' wow? wtf? i did not find anything saying "hecho en mexico" but the tag that says remanafactured in mexico is a little aluminum stick tab underneath the head on cylinder # 1 on the driver side- wierd. it also has the cap for a mechanichal fuel pump on the standard passanger side, is that normal? I lived in salt lake for years- in kearns actually, i seen your in logan, whatsssup lol. thanks for any info. . .

 

I only moved here relatively recently, and I'm too old for whazzup, but hi anyway.
Seems it's a complete mystery about your engine, so still assume dished cast pistons, and weak rod bolts, so assume a 5500 rpm redline, but pop a valve cover and get us a casting number for the heads.