1986 T/A Aluminum Heads
 

Anyone here know the history on the aluminum heads some 1986 t/a's came stock with ? specs, compatiblity, etc...

there were none. Hell, the corvette didn't even come with aluminum heads that year until very late in the production run.

GM never put aluminum heads on a 305, which is all that was available in 86.

Then can you explain to me why I have aluminum heads on my 86 t/a and on my old 88 formula which was also 5.0

the previous owner perhaps put them on. Also how did you verify that you have aluminum L98 heads on your 305?

As far as I know.. No F-body received aluminum heads OEM til 93 with the LT1.

Vette got them late 86.

No 5.0's ever had aluminum heads.

This is all based on OEM as delivered.. one offs, specials, etc.. always possible.

Just be happy someone else bought them...

This is going to be fun. :sillylol: :sillylol:

ok well, its kind of odd then that both were stock when i bought them, yet both aluminum heads.... *shruggs*

never said they were from a L98, just said i had aluminum heads, and i know that cause i took them off

ok, then what other heads aside from AL. L98 heads did GM produce in 86 and 88? AL. L98 Vettes are the only ones that I can think of, there could be others though

BTW ditch the ****in attitude, you asked a question and people are answering it...

dude i'm not giving an attitude, i was just asking questions, sorry if i came out seeming like i have an attitude

**** you!!! :sillylol: It's cool man :)

lol, so can you think of what might have happend then ? cause both cars everything else was Stock, i mean everything, and bam, aluminum heads :confused:

dude that's really, really odd. I can't explain it lol

lol, i mean i'm not gonna say oh hey these wernt sposed to be here i dont want them, lol i was just trying to get some knowledge on them

Got a casting number? That might shed more light on what's going on. The number is usually visible through an oil-fill hole in the VC.

Jason

good idea, dunno why i didnt think of that, thanks bro

How about some pictures?

sure, i'll take some tonight :)

How come your assuming the engine is stock?
How many owners has it been through?

Sometimes peole do mods BUT when they sell it they say it is stock. This gives the buyer the impression that the car wasn't meesed with or raced.

well there was no visual mods, he did say they were takin of and rebuilt, so yeah, i see your point

Um, if it is a 86 block, thoes AL heads must of been drilled for the pre 87 non roller blocks. anyway.. How did you know there alum heads?

read up bro, i said i had them off at one point

ok ok ok ... chill out.. gotta get all pissy. Well you are the first thirdgen owner to get stock alum heads on thier 305. congrats. I would post this in the history board, thoes guys would know.

why does everyone think i'm getting pissy ? I was just saying read up, thats all. not insisting that these heads are stock, was just thinking that it was weird that there was no visual aftermarket mods done except the heads, on 2 differant firebirds 2 differant years. both 5.0L

I can see how this can get out of hand, but right now it seems all civil.

But, regardless of your circumstance, the fact is that aluminum heads absolutely did NOT leave the factory on your car. So, finding out what they are is your first step to determining where they may have come from.

I didn't think you were getting "pissy". There's a difference between "attitude" and simply standing up for yourself. I didn't see a problem.

There were a very few late '86s that recieved Corvette L98 engines as test mules, but those are rare. AFAIK, no '88 had aluminum stock heads, but I don't know everything.

Chances are, someone installed them before you. There's also a good possibility that the cam has been changed, too, and short of checking with a dial indicator, it would be hard to distinguish from the factory cam.

Damn, looks like i'm stuck in a hole then... Well thank you all very much for helping me out with this, I'll just figure it this way.. now i dont need to get new aluminum heads:thumbsup: just get them re machined :)

Boy are you on a roll.

Actually the AL L98 heads have the early style intake bolt pattern, so no modification is necessary as far as that is concerned.

Any pics yet?

huh.. cool

and rezin, im on a roll?

What happend? it just started getting good so whatever happend to the AL heads? did you ever find out what they came out of?

hey, i havnt dont any checking into on my heads as of yet, been busy building my 350 i'm putting in this week, I'll let ya guys know what i find out though :) should be somtime this week.

Hey guys...not trying to add heat to the fire but I came across something very unusual today. The "new" 91 Z28 I have has aluminum heads(w/black valve covers). Its a L98/700R4 with all options except Ttops. It also has 1LE brakes...but thats another story. The reason I know this car came this way is because my dad bought the car brand new in the fall of 1990. Well, today I took the engine out and started to tear it down for a rebuild/cam swap.....and decided Id have the cam checked out. I know the stock cam is .413/.428 right? This cam was .452/.465??? Hmmm...what's going on here. My uncle used to work at the Van Nuys, CA plant(where my car came from). He said that in 91-92 GM started "cleaning" out their parts bin. Obviously, because my RPO codes dont show anything about the brakes or heads. I remember the first time my dad went to get new brake pads for the front....got home.."what the heck"?? Then we were going to change the plugs the first time....but they werent right either. The guy at the dealer didnt beleive us till he came out and looked....Oh well...just thought Id share that with ya. There WERE cars that left the factory with parts they werent supposed to have. Ive talked to a couple people at the Super Chevy show in Bristol....and Im not the only one to end up with "leftover" parts.......

89, Where did you get your TTA setup from?

that is very interesting, thank you very much for sharing that with us, kind of calms my wonders down a little bit

I'll vouch for the 'left factory with not stock parts'. In order to not shut down a line GM will install upgraded, never down graded parts on cars. One example is that some L48 vettes received 4 bolt main blocks when 2 bolt was stock for L48. Gm was running shot on 2 bolt blocks so 4 bolt blocks where use to keep produciton going. Of course if no alum heads where avail the year the car was produced then I would think it would be highly unlikey that it came from the factory like that. Would be interesting the see what the casting numbers pan out as.

i bought a brandee new T A in 1984 and it came with the wrong engine..istead of the standard 5.0 it came with a 5.0 HO engine.......seems it was ordered late in the run,pontiac ran out of standard 5.0's and dropped the HO in........we found out it was an HO motor after we tried to get the card repaired..........none of the pontiac numbers matched the books.Parts guy said wait a min....he read about this before,sure enough he checked the HO numbers and there it was..........car ran very good too

not sure what to say about GM then, could either say you *** damn bastards didnt tell us what we got so it leaves us all like uhhhhhhh. or damn man thanks for the free upgrade !

Hmmmmmm, now there is an explanation for the "factory freak" cars. I always wondered why some cars ran particularly and consistently better than other "stock" cars or similarly modified cars. Ahhhh, now I can sleep at night. :D

hehe seems easyier to get you sleeping better then me, i sleep better when knowing my "isnt" stock, stock engines haunt me in my dreams... :(

Why don't you get the casting # for us, I'm curious what these mystery heads are. Are they angle plug?

The casting number on mine is 10088113.....and they are angle plug.....hope that helps.

10088113...88-up...350..........Aluminum, 58cc, angle plug, raised "D" port exhaust, 1.94"/1.5" valves

aka vette heads...

when i'm ready to get my 350 in the car i'll get the casting numbers for you, it should be soon. like within a week i hope, that way i dont gotta take them back off and put them on and then take them off for the 350. just too much of a pain in the *** :D

Right...that casting number(10088113) is just plain ol' Vette heads....been on the car since November 1990. The only hint at all Ive found is the sticker or tag on the hood(emissions tag??) says the gap for the plugs should be .045 and mentions to let the heads cool completely before plug removal/replacement. On my other 91 Z28 it just says plug gap at .035. Thats the only hint to it at all. The first time my dad was going to change plugs and they told him it had different heads on it that it was supposed to come with.....he was ready to get rid of the car he was that pissed. But, after learning from my uncle of what other car came with them, he calmed down. Like I said before, the car was built at the Van Nuys, CA plant....so Im sure it wasnt the only car to leave with "upgraded" parts. GM would have done ANYthing to keep from shutting the line down.....at almost $28000 an hour:eek: Id like to meet other people that have "different" from stock cars......find out what ol' GM did to keep the F-body line moving......

hey so can you bolt does aluminum heads to a L98 with no moddification to the heads

yeah they should bolt right up.

Keep in mind that mine CAME with them....but yes they will bolt up....BUT, you'll need the early style base plate for the intake.