That is very odd, I guess your egr system is different like the vette's too?

 

Im not sure about that... I havent looked at that in detail. Id say it would have to be though because the heads dont have a heat crossover for the EGR. My other 91 didnt have the motor in it when I got it or I could check it and look at the difference. If I get some time in the next few days Ill post a pic of it to see how different it is.

 

alright thanks at what RPM are does heads rated at

 

Got pics? I'm a doubting thomas, because first, 1991 wasn't the end of the run. Second, The vette heads would require a lot of other part changes, with the different intake manifold, and prom. They would HAVE to do these, because without the EGR operating with the external vette setup, the car would not be emissions legal. With a normal F-body TPI manifold, the car would constantly set egr inoperable codes, right on the showroom floor.

For the comnsumer, they would likely need to add the "premium fuel recommended" tags too, to stem warranty work from fried engines.

I do know that a lot of 1992's got corvette parts, like the black valvecovers, but a valvecover is a bolt on, while the heads are quite a different story. The cam difference is another issue.

I'd be much more incluined to believe these changes, if indeed whhat you say is correct, happened after the car left the line. Dealership promo thing? Even that is doubtful.

 

Yes I will take some pics in the next day or two...Im taking out that motor in favor of a '01 LS1. The car DID come with the aluminum heads(why would I make something like that up? to be cool??). First, you need to do some research....Youll find that the 92 camaro was indeed full of 91 parts as they did quit making them(the parts) in the spring of 91. My car has the 86 earlier intake manifold pattern(to fit the alum heads) and has a sticker when you open the gas cap that says "premium unleaded recommended" The prom and cam ARE different. If you read up a couple posts I said the cam spec'ed out different than the stock TPI5.7 cam. The only difference in the prom is the spark table....to compensate for the alum head's higher allowance for spark knock. My dad went to the dealership...ordered the car...came in about 2weeks later....with 17miles on it. Now unless somebody stole the car in that time and put those parts on it....Id say they came with it. My uncle used to work at the Van Nuys Ca plant and he said that they started "cleaning house" when the LT1 was ready( it was completed in 90). They knew they'd have a stockpile of parts leftover...so they put them on random cars........and also did whatever they could to keep the assembly line going. You will have pics in a day or two......Man, why does everybody get the "non-believer" attitude??? And finally...why would I just decide to make this **** up???? Like I dont have anything better to do or somethin....

 

You still havent explained the EGR issue to my satisfaction. I cant see them putting that system on an F-Body and it not be tested with the gearing and weight of an F-Body. It would basically have corvette tuning for a different car. I dont think the EPA would like that very much!! So I guess on the F-Body assembly line they Had A Corvette Intake, Heads, Prom and Different exhaust manifolds for the different EGR system,just waiting to be put on your F-Body. That is truly amazing!

 

The engines were not assembled at Van Nuys. They were most likely assembled in Flint & shipped as an assembly to Van Nuys with intake, EGR & all accessories already on it, ready to drop in the chassis as rolls down the assembly line. I have been working for GM dealers for longer than a lot have you have been alive & have ordered many production line motors (not crate motors) They come with everything already on them, right down to plug wires & harnesses.

 

thank you... i was just gunna say that... i wish my 87 came with alum heads... dam it... oh well... maybe one day ill grab them off someone and port the **** out of them... heheheh

 

The engines were not assembled at Van Nuys. They were most likely assembled in Flint & shipped as an assembly to Van Nuys with intake, EGR & all accessories already on it, ready to drop in the chassis as rolls down the assembly line. I have been working for GM dealers for longer than a lot have you have been alive & have ordered many production line motors (not crate motors) They come with everything already on them, right down to plug wires & harnesses.




That is TOTALLY NOT TRUE!!!!! The engines were assembled right oustide of Van Nuys, CA in a two story warehouse/machine shop. I have been working for a Chevrolet Dealership for 9years now.....wtf does that have to do with the subject??? That youre old?? I swear....its not like I decided to make this **** up or something....there are other cars like mine. If you look hard enough...youll find one.



You still havent explained the EGR issue to my satisfaction. I cant see them putting that system on an F-Body and it not be tested with the gearing and weight of an F-Body. It would basically have corvette tuning for a different car. I dont think the EPA would like that very much!! So I guess on the F-Body assembly line they Had A Corvette Intake, Heads, Prom and Different exhaust manifolds for the different EGR system,just waiting to be put on your F-Body. That is truly amazing!


What difference does it make what EGR system is on the car??? They both perform the same function.....Exhaust Gas Recirculation.....and the exhaust is the same slick.....from what I can gather.....its been on there since the car was brand new.....17 miles on it.

 

heres a couple of older pics...I will take new ones when the engine comes out this weekend....

 

heres a closer view of the external egr on the passenger side......

 

I dont think you understand too well.....I never said that the engines themselves were assembled in Van Nuys.....I said when GM realized it would have a mountain of parts from the C4 leftover....it carried over to its cousin the Fbody.....GM has been known to do this in the past. If you dont believe me...go ask some of your fellow co-workers...or send GM an email....ask my uncle that worked there....Just because you dont understand something or are a total non believer doesnt give you the right to say that youre smarter....just because youve "worked somewhere as long as Ive been alive" You have no ****ing clue how old I am.....

 

SO your telling me they had vette exhaust manifolds with the EGR hook up for your camaro and the Vette Exhaust manifolds bolted right up to the F-Body exhaust? Also those arent Black Valve covers Like you said you had on your Motor! Also, is that your timing connector right there. Strange mine isnt there on my 91Z 350. Maybe they changed the wire harness also

 

The valve covers were black...before all the paint "melted" or chipped off them...so I had the sandblasted at work...and what are you talking about a timing connector?? In the second pic? Thats just a picture of the EGR pipe......

 

Right below the Injectors, looks like a Timing connector.

 

thats pretty cool u had a vette motor kyl98 did it feel more powerful that a regular 350 z

 

They had it all over-nighted from BowlingGreen, OH

 

Mose likely its the EGR feedback switch connector, same style connector as the EST wire.

 

Gee and I thought that was the corvette plant I drove past in Bowling Green KY which is only about an hour from my house

 

If you look closely at the pic above those are perimeter bolt corvette valve covers which would make the heads underneath corvette aluminum heads. I believe we have ourselves a genuine factory freak. Thats pretty damn cool. Got any times for that car?

 

Thats even more funny, they put really old heads on it, damn they waited along time to put those on a 91.

 

I'm glad I wasn't the only one who caught that...


The L98 corvette heads had centerbolt valve covers, BTW.

 

no they didn't

Here is a closeup of one.
http://www.corvettemagazine.com/2000...vr/valvep1.asp

 

yes, they did...look...

 

I don't know which years had them and which years didn't, but I do know they did make perimeter bolt L98 heads.

 

If this wasn't a Vette engine I would have to ask why the EGR is external and the fuel lines feed to the TPI from the passenger side, both Corvette trademarks.

RBob.

 

i dunno if anyone else picked this up, and maybe its my eyes playing tricks on me, im tired..... but, that dist cover looks like its aluminum, and not plastic.... could he have a vette motor all together?

 

that would be cool

 

maybe its a 4-bolt block then

 

Well the engine is out.....I will have pics soon. I did find the casting for the intake 10068015...and again the heads are 10088113. I cant read the one on the block yet, not until I scrub it some. I did find something very weird though....My dad found the window sticker last nite and on the options there is a code that says "optionB2L(B4U)(1LE)....wtf??? I know what the B2L is....but isnt B4U the code for 91 Firehawks from SLP? And obviously that "might" explain the different brakes front and rear(alum drums). Im starting to have my doubts. My dad doesnt have a clue what any of that is....He just wanted a Z28. And the manifolds arent really manifolds....they are kind of a tubular exhaust with the plumbed EGR pipe in the passenger one.......What the hell's going on here.......

 

Well, the Corvettes did get that type of exhaust manifold. . . For some reason I think that this vehicle should be kept numbers matching and all original. . .

edit: from TGO tech area:

B2L : PERFORMANCE PACKAGE & ENGINE PACKAGE V8 5.7LPFI
B4U : PERFORMANCE PACKAGE, SPORT
1LE : PERFORMANCE PACKAGE COMPONENTS

RBob.

 

i would keep it all original also thats very rare ill have to come check it out

 

Yeah...that way I can have another set of eyes look at it.....maybe we can you can come see it this weekend....if its really that rare...I might just keep it the way it is....My uncle is trying to verify who assembled it(motor and car) .....should know something in the next week or two.

 

Excuse me, meant KY don't know why I put OH...Same applies though.

 

Was this a late year car? If so they may have run out of the engines for the F bodies and had to use the what they could get. I know that in 85 the LB9 engines were in short supply and ordering a car with one in it would delay your order an additional 2 months on top of the 1 month for a plain jane.

 

you should sell for it to a museum for alot of money lol

 

yea they can put it next to the snake with 2 heads and the 22ft tall guy

 

LOL, they Found an early model vette engine to put in an F-Body at the factory, I wonder how they missed that motor for so long and it didnt get put in anything else, Like a Vette?? 87 and up had center bolt valve covers didnt they?

 

The aluminum corvette heads are centerbolt valve covers. They do not have and never did have any provisions for perimeter bolt valve covers. If you think otherwise, you dont know what the hell you are talking about. Post as many links as you would like, but fact is that they are all centerbolts. So... if those are perimeter bolt valve covers, those are not corvette L98 aluminum heads, sorry.

I'm not buying the story. I'd like to know what sort of RH exhaust manifold that engine is using, what the part number is. There wasnt any provision on the factory ones for the Corvette EGR tube.

 

I agree Mad

 

Interesting story. Certainly there were some odd things that left GM's plant.

- If by chance, that engine left the factory with vette heads, it is near impossible to document. There is no VIN number on the heads. Perhaps you can check the VIN on the block, but I suspect it will be a run of the mill block. Unless the corvette motors had a different casting number. If so, then if your VIN is stamped on the block, you have some evidence that you have a vette motor in an F-body. That would be unique.

- If you notice in the picture, the motor has cast valve covers and not stamped. It also has the aluminum dist cover. And it has the corvette EGR pipe. At first glance, one would guess it was just a vette motor transplant.

It will be interesting to see what you come up with.

Mark.

PS. regarding the permiter bolts on vettes. The link that was a posted was for an early vette with cast iron heads, not aluminum.

 

GM manufactures and sells a center bolt to perimeter bolt valve cover adapter. So it is still possible for the combination as shown to be valid.

RBob.

 

Well....got some good news and some bad news. I finally got to talk to my dad and uncle this morning. I remember when my dad had about 1500mi on the car he had problems with the car, but he just told me "they fixed it". Turns out the car spun a bearing and was junk. So, they replaced the engine. The service advisor at the Chevrolet dealer ordered a "Corvette" engine....thinking it was identical to the motor that was in there. My uncle said that GM even marketed the car like that....saying "......with its corvette derived 5.7 Tuned Port Injection..." So I guess that led alot of people to believe it was identical. So that explains how the motor got in there. But it doesnt explain if the engine was brand new, or rebuilt...etc. To be honest, I dont know how they got the corvette manifolds to fit. Ive recently seen up close the regular Fbody manifolds....and they look nothing like the ones on my car. I guess I led you guys on....not knowing the full story on the car....

 

The only misleading part was that it was factory installed. Everything else you said/posted is true. I must say though, the dealer mechanics did one hecka' of a job to get the engine installed and running.

Was your Dad happier with the new found power?

RBob.

 

My dad said he thought it felt stronger.....but it thought it was because the first engine had problems. I talked to the mechanic(s) that installed it.....they said besides rigging up the manifolds and fuel lines...that it was easy. Took them about 5hrs.

 

Cooool. . . (Just don't know how else to put it. . . LOL). Can I get dib's on the engine & trans?

RBob.

 

Well I was right, it didnt come from the Factory that way!!

 

i'm going to try the replacement i'm going to port and polish them i think i could get some mean hp out of them

 

Uh... the 'manifolds' are SLP headers. The valve covers are 85-86 TPI valve covers, NOT corvette valve covers. Something doesn't match up here.

 

someone explain??