Engine Decal (Page 1/2)
Rhodesia1977 JUL 25, 08:44 PM
So I was at a car show with my 86 GT. A feller came with his 87 GT (both are fastbacks). We were looking at the engine where it is cast Fiero. He said that the 86 should have the decal and not the cast Fiero. He thinks maybe my engine was replaced with an 87 at some point (I don't really know the history of my car very well). I thought I once read that in late 86 V6's they started to use the cast and got rid of the decal. Does anyone know anything about this? Thanks for your time.
css9450 JUL 26, 07:57 AM

quote
Originally posted by Rhodesia1977:

I once read that in late 86 V6's they started to use the cast and got rid of the decal. Does anyone know anything about this? Thanks for your time.



Never heard that before, but can you check your VIN number and see if it's very near the end of '86 production? I think the most likely explanation is that someone swapped the '87-88 style upper plenum onto your engine. An easy conversion.
fierofool JUL 26, 08:53 AM
I have an 86SE that was produced in late May of 86. The original engine had the FIERO decal instead of the engraved FIERO.
Rhodesia1977 JUL 26, 09:42 AM

That makes the most sense. I also found a Carfax report from 2017 that it had a slave clutch install and manual transmission work BUT it is an automatic. Maybe the original entire engine was removed. Is there any type of marking on the engine itself that would tell the date of the engine? Thanks for the reply.
Rhodesia1977 JUL 26, 09:44 AM
Interesting. Thanks for the reply.
fierofool JUL 26, 11:24 AM
Original engines were supposed to have a serial number on the starter flange bellhousing mount area above the starter. I didn't read all of this link but there is a photo by rubyredfiero that shows part of the vin number just below the thermostat housing. https://www.fiero.nl/forum/...410-1-048013.html#p6

There were slight changes in the V6 engines through all years. Most of them were internal. I have read that in 87, the oil galleys throughout the block were enlarged for better oiling. So, that would be an improvement over the earlier engines. Of course, the 88 got the internally balanced crank.
Rhodesia1977 JUL 26, 12:54 PM
Hey, thanks for the info. I think I have it down to either, the engine in now is not the original (possibly an 87) or they put on a later plenum with the Fiero cast onto my original 86 V6. Thanks a lot for your guidance.
Kitskaboodle JUL 26, 01:21 PM
It's a fact.......that 85 & 86's have the "Fiero" sticker and the 87-88's have the engraved plenum.
Because it is common that many in the V6 Fiero community take off their plenum & valve covers
(because they need repainting & refinishing) they use that opportunity to swap out their plenums
with someone with another set, from a 87-88 V6 Fiero in a yard, etc.
Kit
cvxjet JUL 26, 02:51 PM
I swapped in a late model-engraved intake- I like it more. I also took the opportunity to "port" the intake at the pinch-point...After painting it, I installed it and it looks great...but it makes the rest of the engine look bad (need to clean/detail/paint the rest of the engine)



[This message has been edited by cvxjet (edited 07-26-2022).]

Rhodesia1977 JUL 26, 05:00 PM
So the pic of that 85 V6 on the left is a decal? I have never ever seen one. Is it just the Fiero part or is the part with the lines too? Also, how long did the original decals last? I would guess they would wear off easily with all the heat. Very interesting. Thanks for your help!