StanganatorZ28

Sounds stupid but from what data Ive accumulated there is no tell tale sign to know whether my engine is a 350 or 305. For starters almost every sight Ive visited has said that if the 8th digit of the vin is an "8" that it is a 350 and if it is an "F" that it is a 305. My 8th digit is an F. But in my defense from my knowledge 305's were 5 speed trannys, 350's were automatic.

-My speedometer is registered for 110.

- Its an automatic on the floor.

- T-tops

- Ferrari spoiler

- Has the P245/502R-16 tires all the way around.

- Not true duels one pipe runs into 2 behind rear axle.

- Everything appears to be factory, in fact the idiot I purchased it from painted drivers side valve cover orange but was to lazy to remove the heater core hoses on passenger side to paint that one.

- 163,000 will roast tires if brake applied but only barks them without brake from dead stop, but will fish tail for about 20 to 30 yards in 3rd gear at wide open throttle.

- Vin: 1G1FP23FXML122931

BLKIROCZ87

if its an original engine then its a 305 tpi (Lb9)by your vin #
305`s came with manual and auto
350` only Auto
On the back of the block there is a stamp that will say 5.0 or 5.7

StanganatorZ28

Ok thank you. Will i need to remove anything to locate the 5.0 stamp? Its on the drivers side of the block isnt it?

Phenom-1

You have the 5.0 TPI It's nice but Not as Monstrous as the 5.7, also the 5.7 came with Small Dual Cats, the 5.0 only had one long Single Cat, and it also had the 110mph speedo, the only ones to get the 145 mph speedo were the 5.7 and the 5.0 with the 5sp, the 110 came on 5.0s with auto and 3.1 on RS

StanganatorZ28

Ok thanks guys i appreciate your help. Im gonna go be depressed now

Phenom-1

No reason to be depressed dude, you got a nice Z28, its not the top dog but its one that I actually want, a blue '92 Z28 with t-good light charcoal/grey cloth int, A4 with the 305 TPI even if it will get beat by stoday v6 mustang I don't care Because What I Want is all that matters. So be proud of what you got. You can always upgrade to a 350 block if you just have to have the pwr or feel the extra torque or Rumble from the 5.7. Or just find a '91 '92 original optioned Z28 with the 5.7 and have them both

StanganatorZ28

Lol thanks

yaj15

iTrader: (3)

You have a small block chevy, nothing to be down about that. It's one of the worlds best engines. You can leave it stock or modify if to what you want it to be. The important thing is that you saved the car and are going to keep it in good shape. Its very easy to swap in a 350 engine if thats what you want down the road later.

StanganatorZ28

True, true I really appreciate your guy's enthusiasm, maybe its not so bad after all, its a beautiful car and I can save on gas while I build a badass 400 or 383 from block up.

StanganatorZ28

And I have heard that 305's will run up to 300,xxx or even more if you take care of it.

Phenom-1

My 5.7 '92 has 191,000+ and it runs fine. that's after 180,000 of those miles were driven HARD by the Previous owners before me. I have had it for over 5 years but don't drive it too much & I recently have it in storage due to running out of gas money for it. And I feel I should give it an overdue rest.
Neither the engine or Trans has ever been Rebuilt. Those are all original Bearings valves pistons rods heads cam, crank & chain.

StanganatorZ28

Wanna trade? Lol

StanganatorZ28

Mine only has 163,xxx, never misses a beat. (except for when i forgot to plug the alternator back up yesterday after tinkering, then drove about a mile before it started stuttering lol)

Phenom-1

Having Fun is All that Matters just like this guy on the Video and his '92 5.0 TPI M5 did

Stevolwevol

iTrader: (1)

Alright my 2 cents: Both of my Camaros have 5L engines. On a cool day I can get scratch in 2nd without punching all the way. They sound great, maneuver fantastically. No complaints here.

StanganatorZ28

Alright guys I need your advice. I'm going tomorrow to look at an 85 Z28 350 5.7 Ltr with 90,000 original miles, its perfect mechanically but it has a few blemishes on the body, needs paint etc. . He wants to trade me title for title, do you think this is a good deal?? Is it worth it for the 350 drivetrain with only 90k original miles?????

Stevolwevol

iTrader: (1)

You really need to see the car, and test drive. Even at 90k there could be problems if it were abused.

BLKIROCZ87

right you have to see and drive it first, find out what the motor is from, because im sure you know that there were no 5.7's in 85.. so 90k original what? body - motor? and dont just jump on it because its a 350, and check for rust-- look at the floor boards make sure there's no rot. just look it over... if your gut tells you not to do it, just back off.

StanganatorZ28

Ok, what motors did they have in the 85 Z28's?

BLKIROCZ87

in 85 there were 3 diff. 305 versions...
lg4-305 carb= 155hp
l69-305 carb -High output=190hp
lb9-305 TPI =215hp
I think the l69 was only offered in the iroc as an option

Stevolwevol

iTrader: (1)

LG4, or LB9. The Lg4 is a metered quadrajet 4bbl carb, and the LB9 was the first tuned port injection. Both were 305 displacement. If it is a 350 it was a replacement motor. You won't really know the mileage.

StanganatorZ28

He says the motor isnt original. From the pic i can tell that it is tpi, and the alternator is on the opposite side as mine(its on the passenger side).

StanganatorZ28

It doesnt have an a/c compressor either?

cuisinartvette

If you like your car just put a 350 in it they are a dime a dozen.
Cheaper in the long run

fivestar

Phenom,
I have an 88 Iroc convertible with the 305 TPI with about all the bells and whistles and it is an automatic with the 145 speedo with 7k Tachometer, oil cooler, performance rearend. I am the third owner and all the numbers match. There were 5.0 cars that came from the factory with the auto trans had the 145 speedo and other items that the 5.7 Iroc's had...

Fivestar

Phenom-1

To my Knowledge & Experience the Iroc-Z would only come with the 145 mph speedo on 350 TPI Equipped cars or on 305 TPI cars that HAD the M5. There wasn't a 305 TPI A4 Droptop car that came with the 145 factory. Those came with 110s

Convertibles
305 TPI M5 = 145 Speedo
350 TPI A4 = 145 Speedo
305 TPI A4 = 110 Speedo

fivestar

I have seen plenty of other Irocs with the 305 TPI and the 145 speedo including a couple of other verts here in Colorado, all seemed to be well optioned Irocs and many have the auto trans. I bought an 89 Iroc that came with a 305 TPI 5 speed that became the donor car for my 58 chevy steetrod and I completely dismantled the car and still have the parts including the original 110/115 speedo.
I know there are others out there that have the 145 speedo with original 305 TPI's out there-let's hear from you...

Fivestar

fivestar

I am not sure if the pic that I was trying to attach actually uploaded...
It is a pic of my 305 TPI with 5speed from an 89 IROC that I fit into my 58 chevy. I did buff the aluminum parts and detailed the engine before fitting back in the car...

Fivestar

cIaRmOaCrZo

you have any pics of this car?

Phenom-1

Here a Pic of the '92 Z28 T-top A4 5.0 TPI I want.

http://images.craigslist.org/5I85Fa5...a37c361a09.jpg

StanganatorZ28

yes go to my profile there is pics of my car there.

StanganatorZ28

Ok so Im confused! I went an looked at the 85 camaro. The speedometer only goes up to 85? on the outside of the car it says Z28, but inside on the dash where mine says "Z28", this one says Iroc-Z?? any ideas on this one? the vin number is 1G1FP87F8FN150683. I couldnt see the whole casting number for on the head but the last four digits were 7369 from as far as I could see. I cant find that on any web site, can anybody help me? lol

yaj15

iTrader: (3)

IROC's are also Z28's. B4Z is the option code to get the IROC between '85 - '87. From '88-'90 there was no B4Z code, all the IROC's were Z28's as GM dropped the Z28 model all togther and just made IROC-Z's. Between '88-'90 the RPO code Z28 designated that you had an IROC.

After all this time someone could have swtiched the emblem on the dash so you can't go by that. The VIN number and the RPO code will tell the real story of the car. Z28's just had a dash emblem that said Z28. Depending on the engine option it may have had Tuned Port Injection underneath it. Starting in the '85 model year you couldn't get the L69 engine in a regular Z28 anymore. For '85 your only regular (non-IROC) Z28 engine options were the LG4 and the LB9.

The IROC's got the dash emblem that says Z28 with IROC-Z below it. All IROC-Z's are Z28's. The IROC's were just regular Z28's with the IROC-Z option on them. For '85 the L69 engine was limited to the IROC's (previously available in late production '83 Z28's and '84 Z28's) with 3.73 posi rear and 5-speed trans only. You could also get the LB9 and LG4 as well.

From '82-'84 all the Z28's had the double pointer 85mph max speedometer. This was part of the govenment mandate to have cars with lower top speed speedometers to reduce drivers speed. You could purchase a 140mph max speedometer from the GM dealer. It has a Z28 logo on the face of the speedometer and it is a single pointer unit.

Starting in 1985 the double pointer speedometer was dropped and the single pointer speedometer took its place. All the '85 Z28's and IROC's had the 85mph max speedometer. I think in mid or late year '86 the 140mph max speedometer went into full production. When this happened you could have the LG4, L69 (although only about 70 L69 engines were produced only for regular Z28's - I think the exact figure is 74 - I am sure someone will correct me if my history is wrong), or the LB9 in the Z28 or IROC.

All of the Z28's and IROC's should have had the 140mph speedo from the start. Ha ha we can thank government mandates for that one. Also wasn't the speed limit 55mph back then? It think thats why we all have that blue mark at 55mph on our speedos as well.

StanganatorZ28

Stevolwevol

iTrader: (1)

Looks good from the pic. I'd like to know about it after you have a look in person. Too bad it isn't red!

StanganatorZ28

I just posted a pic of a 1985 Iroc-Z28, exactly like the one I looked at today it has the same pulley assembly.... its a 305

StanganatorZ28

Actually the car I looked at today is red, it needs one new fender and a new passenger door. Guy wants 2,000 for it. I dont want it, mine looks waaaaaayyy better!

Stevolwevol

iTrader: (1)

What about the blue Z28? Did you have a look?

fivestar

1985 Z28/IROC-Z
85 mph speedo

1986 Z28/IROC-Z
85 mph-there were a few 145mph speedos introduced late in he production year on 305 TPI cars.

1987 Z28/IROC-Z
85 mph (LG4)
145 mph (LB9/L98) this includes convertibles with the LB9

1988 Z29/IROC-Z
115 mph (LG4)
145 mph (LB9/L98)-includes convertibles with LB9

1989 IROC-Z
115 mph (LO3 & some LB9's)
145 mph (LB9/L98)
115 mph for convertibles

1990 IROC-Z (last year of the IROC series)
145 mph (LB9/L98)
115 mph for convertibles

1991-1992 Z28
145 mph (LB9/L98)
115 mph for convertibles

Hope this is helpful

Fivestar

fivestar

1985 Z28/IROC-Z
85 mph speedo

1986 Z28/IROC-Z
85 mph-there were a few 145mph speedos introduced late in he production year on 305 TPI cars.

1987 Z28/IROC-Z
85 mph (LG4)
145 mph (LB9/L98) this includes convertibles with the LB9

1988 Z29/IROC-Z
115 mph (LG4)
145 mph (LB9/L98)-includes convertibles with LB9

1989 IROC-Z
115 mph (LO3 & some LB9's)
145 mph (LB9/L98)
115 mph for convertibles

1990 IROC-Z (last year of the IROC series)
145 mph (LB9/L98)
115 mph for convertibles

1991-1992 Z28
145 mph (LB9/L98)
115 mph for convertibles

Hope this is helpful

Fivestar

StanganatorZ28

Yes thank you

StanganatorZ28

My 91 Z28 has a 110 speedo

StanganatorZ28

Its a 305, as we have established. lol

StanganatorZ28

A big thanks to everyone, for all your help! You guys have been truely helpful and supportiveI like this site Ill be a member for as years to come(or untill they ban me lol)

StanganatorZ28

What do you guys think about this truck? He wants to trade me for my car?? Its not multi colored anymore its all black now.

StanganatorZ28

It has a 355 in it, mileage unknown since rebuild, has a 7 inch lift kit and 2 sets of 33.5 thornbirds, one set street tread and one set of big knobbys.

cIaRmOaCrZo

well considering you are in a 3rdgen camaro community, asking that question, you should know what my answer would be about trading for that truck

cuisinartvette

So are you asking about an engine swap selling your car or what?
All over the map here lol.

StanganatorZ28

Lol true ciarmoacrzo, thats why I have you guys, so every time Im about to do something stupid like trade my car for a gas guzzling monster, you guys re-assure me of the stupidity involved. lol

cIaRmOaCrZo

lol sorry for the broad answer. NO way would i trade that 91z for that truck better?