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My 89 formula 350 ASC vert

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Old Jan 26, 2023 | 01:09 PM
  #151  
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From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: My 89 formula 350 ASC vert

Hey Tony.

I had planned on Alston "inner" SFCs for my car (T-top). Just curious what these DID and DID NOT do for you compared to your hopes and expectations (understanding that this is a convertible, which adds some additional challenges).
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Old Jan 26, 2023 | 03:57 PM
  #152  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

I think they were Alston style inner that i welded on. they did help a little, maybe i had higher expectations that they would work as well as the outters i liked to use back in the day.
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Old Jan 26, 2023 | 06:56 PM
  #153  
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Car: 1989 IROC-Z 305 LB9 AT Convertible
Engine: LB9 305
Transmission: AT
Re: My 89 formula 350 ASC vert

Originally Posted by TTOP350
I think they were Alston style inner that i welded on. they did help a little, maybe i had higher expectations that they would work as well as the outters i liked to use back in the day.

Spohn make outers specifically for the Verts. Some on TGO have used both. I bet that would really get the Unibody closer to modern rigidity!
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Old Nov 25, 2023 | 11:32 PM
  #154  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert





Haven't had a lot of time to drive it this year, plus the old cats rattling and the weird front suspension pop and clunk when turning have really kept me out of it. Thanks to "gotopless", the
"new" cats came the otherday, so there's 1 fix. Have bilstein struts for the front and new frontend rebuild parts, now i just need the time!
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Old Nov 26, 2023 | 02:59 AM
  #155  
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Car: 1989 IROC-Z 305 LB9 AT Convertible
Engine: LB9 305
Transmission: AT
Re: My 89 formula 350 ASC vert

Nice looking Dual Cat setup, TTOP350 ! What brand? :Like N10 or even better?
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Old Nov 26, 2023 | 03:09 AM
  #156  
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From: Imperial, Missouri
Car: 89 IROC/89 Vert/87 Vert/89 GTA Vert
Engine: 5.7/5.0/5.0/5.7
Transmission: 700R4
Axle/Gears: 9" 2.77/9" 3:23/9" 3:42
Re: My 89 formula 350 ASC vert

DANG, those are pretty. Nice score.
Originally Posted by TTOP350




Haven't had a lot of time to drive it this year, plus the old cats rattling and the weird front suspension pop and clunk when turning have really kept me out of it. Thanks to "gotopless", the
"new" cats came the otherday, so there's 1 fix. Have bilstein struts for the front and new frontend rebuild parts, now i just need the time!
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Old Nov 26, 2023 | 07:03 AM
  #157  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by mikeceli
Nice looking Dual Cat setup, TTOP350 ! What brand? :Like N10 or even better?
They are the original AC brand GM used for RPO code N10, but since these don't have the after cats Y pipe part, they are probably over the counter replacements or even maybe for the ZZ crate motor kit for Fbody.
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Old Nov 26, 2023 | 10:16 AM
  #158  
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Car: 1989 IROC-Z 305 LB9 AT Convertible
Engine: LB9 305
Transmission: AT
Re: My 89 formula 350 ASC vert

Originally Posted by TTOP350
They are the original AC brand GM used for RPO code N10, but since these don't have the after cats Y pipe part, they are probably over the counter replacements or even maybe for the ZZ crate motor kit for Fbody.

Thanks!
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Old Feb 9, 2024 | 06:16 PM
  #159  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert


Should i swap it? 🤔
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Old Feb 9, 2024 | 08:19 PM
  #160  
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Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: My 89 formula 350 ASC vert

You have a LT5 engine laying around?

Last edited by Airwolfe; Jul 9, 2024 at 12:25 PM.
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Old Feb 9, 2024 | 09:08 PM
  #161  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by Airwolfe
Have have a LT5 engine laying around?
I certainly could!
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Old Feb 11, 2024 | 06:02 PM
  #162  
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Car: 91/89/85/82 Z28s, 88 TA, 88/88 SC
Engine: SBC and LS variations
Re: My 89 formula 350 ASC vert

the 90's LT5 is a wonderful engine in many respects including its looks... i have a ~12K mile '90 ZR-1 and it is quite nice... the engine can have some quirks with the complexity of the injectors, induction system control, starter, etc... also the ECMs are reliable and your typical chip burning, but spare ECMs are pricey

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Old May 1, 2024 | 08:46 AM
  #163  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert




When you find a nos bumper without front plate holes drilled, you buy it.
Pretty nice surprise to find 2 more dirty but nos parts inside the bumper cover.. score
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Old May 1, 2024 | 09:07 AM
  #164  
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Car: 85 Z28/87 IROC-Z/92 B4C
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Axle/Gears: 9"/Dana 44/10 bolt
Re: My 89 formula 350 ASC vert

Thats a hell of a score! Getting extra nuggest at Mcdonalds
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Old Jul 8, 2024 | 11:34 PM
  #165  
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert


Tires were a bit on the old side and broke a cord in left front last time i drove it, so i put on some tires to get me by untill the 17s come out


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Old Jul 9, 2024 | 01:29 AM
  #166  
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Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: My 89 formula 350 ASC vert

Nice 1LE brakes you have on her. What are the grey things around the popup headlight?
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Old Jul 22, 2024 | 08:51 AM
  #167  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by Airwolfe
Nice 1LE brakes you have on her. What are the grey things around the popup headlight?
That's my extention cord outlets for the battery tenders
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Old Jul 22, 2024 | 08:56 AM
  #168  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert






Finally had some time to open the cat up and remove the 20% that was left in there rattleing around. It had all blown out the rear.
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Old Jul 22, 2024 | 08:58 AM
  #169  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert


Put 17"s on the vert or ?
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Old Jul 22, 2024 | 11:24 AM
  #170  
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Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: My 89 formula 350 ASC vert

I like the Black 17x9 PW7 wheels on the 92 Formula 350 and the 17x9 PE0 wheels on the 89 Formula 350 ASC convertible.
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Old Jul 22, 2024 | 12:09 PM
  #171  
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Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: My 89 formula 350 ASC vert

Originally Posted by TTOP350




Finally had some time to open the cat up and remove the 20% that was left in there rattleing around. It had all blown out the rear.
Did any of the big pieces and chunks of the cat end up in the muffler?

What's your plans for replacement of the N10 cats on this car?

Does this car have the SLP Tri-Y headers and pipes for the N10 dual cats on it?
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Old Jul 22, 2024 | 02:57 PM
  #172  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by Airwolfe
Did any of the big pieces and chunks of the cat end up in the muffler?

What's your plans for replacement of the N10 cats on this car?

Does this car have the SLP Tri-Y headers and pipes for the N10 dual cats on it?
I'm not sure, it had a cheesy aftermarket replacement catback when i got it.

Probably going weld the empty shell back in for now. I do have a nos set if i want to put them in.

Yes, tri-ys for n10 and totl. i installed the full SLP kit, small cam, ported e-lower intake and ported everything else.
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Old Aug 4, 2024 | 02:28 PM
  #173  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert





Well, this got pushed to the front burner. My daughter just unexpectedly won little miss in town sooo... new top, fix A/C, paint spoiler, bumpers, fix dents, and other small random things. Plus, 17" wheels. It'll be her car some day
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Old Aug 4, 2024 | 03:31 PM
  #174  
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From: Imperial, Missouri
Car: 89 IROC/89 Vert/87 Vert/89 GTA Vert
Engine: 5.7/5.0/5.0/5.7
Transmission: 700R4
Axle/Gears: 9" 2.77/9" 3:23/9" 3:42
Re: My 89 formula 350 ASC vert

Originally Posted by TTOP350




Well, this got pushed to the front burner. My daughter just unexpectedly won little miss in town sooo... new top, fix A/C, paint spoiler, bumpers, fix dents, and other small random things. Plus, 17" wheels. It'll be her car some day
18" Ronals you meant to say, right.....lol. your pal, Steve Roberts (new FB name)
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Old Aug 4, 2024 | 04:46 PM
  #175  
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Re: My 89 formula 350 ASC vert

looks great and appears your daughter is having some great fun part of the thirdgen crowd which is even better!
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Old Aug 5, 2024 | 11:46 AM
  #176  
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Re: My 89 formula 350 ASC vert

A dad's gotta do what a dad's gotta do, especially when his little girl is involved.
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Old Aug 10, 2024 | 05:31 AM
  #177  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Had a little fun in the shop yesterday.
Along with wheel swaps, i put the factory crank pulley on so the charging system would be happier during this next yrs upcoming parade duties. Just wish i was further along with it, but it's so much fun to drive as is.



Original gators


Had to get a reminder of what the original gatorbacks looked like

Borrowed a set of nice 16" repops from a friend. Now if he'll sell me a set from his hoard

Last edited by TTOP350; Aug 10, 2024 at 05:35 AM.
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Old Sep 3, 2024 | 08:55 AM
  #178  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert


Rare shots with top up and me not driving. Wife and kids with little miss on their way to a parade.

Noticed a bulb out on the 3rd brake light. Opened a can of worms with the loose bracket setup


Back window is falling out, needs a new top buut

Last edited by TTOP350; Feb 3, 2025 at 04:28 PM.
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Old Sep 3, 2024 | 10:05 AM
  #179  
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From: Imperial, Missouri
Car: 89 IROC/89 Vert/87 Vert/89 GTA Vert
Engine: 5.7/5.0/5.0/5.7
Transmission: 700R4
Axle/Gears: 9" 2.77/9" 3:23/9" 3:42
Re: My 89 formula 350 ASC vert

Did the Formula350 come with ZR rated tires or VR rated? I still have the set of VR rated gatorbacks dated 1988 he in St. Louis. I didn't know they ever remade the ZR 245/50/16s

Originally Posted by TTOP350
Had a little fun in the shop yesterday.
Along with wheel swaps, i put the factory crank pulley on so the charging system would be happier during this next yrs upcoming parade duties. Just wish i was further along with it, but it's so much fun to drive as is.



Original gators


Had to get a reminder of what the original gatorbacks looked like

Borrowed a set of nice 16" repops from a friend. Now if he'll sell me a set from his hoard
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Old Sep 3, 2024 | 07:42 PM
  #180  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by rarebmx
Did the Formula350 come with ZR rated tires or VR rated? I still have the set of VR rated gatorbacks dated 1988 he in St. Louis. I didn't know they ever remade the ZR 245/50/16s
89 was the 1st year for ZR, my other 89 350 had them as well.
these are original wheels and tires from a 91 formula
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Old Sep 5, 2024 | 06:28 AM
  #181  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert


The can of worms

Sealed

Empty can

New seal

Will need to mod the brackets slightly so its not pulling down so hard. Simple fix. New bulbs are on the way, every replacement I've seen are 2 tall or don't fit right. GE 891 looks to be the correct style, shape and size of the originals

Last edited by TTOP350; Apr 12, 2025 at 08:15 PM.
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Old Sep 5, 2024 | 08:38 AM
  #182  
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Re: My 89 formula 350 ASC vert

There are many great, higher-end Firebird trims on the site. I have a GTA that's in great shape..

But if I could pick one Firebird to own, outside of an '89 TTA, this one might be it. Formulas have always been my favorite trim level. I prefer the sleeker look without the ground effects. It makes a beautiful convertible.
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Old Feb 3, 2025 | 01:41 PM
  #183  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert













NOS top looks to be correct as can be.
The top currently on the car was replaced in 1996

Last edited by TTOP350; Feb 3, 2025 at 04:38 PM.
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Old Feb 3, 2025 | 02:02 PM
  #184  
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Re: My 89 formula 350 ASC vert

Originally Posted by TTOP350






NOS top looks to be correct as can be.
The top currently on the car was replaced in 1996
Nice! Where'd you find that top? Is it black? Looks blue in the pics.

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Old Feb 3, 2025 | 04:36 PM
  #185  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by chazman
Nice! Where'd you find that top? Is it black? Looks blue in the pics.
I bought the top from a guy on E-bay over 15 years ago, (trying to find out exactly who so I can get more tops).
The top is blue, my car had a blue top from ASC. One of 2 blue top formula 350s and the only one left according to John Z.

Would love to do a ground up resto on this car but then I wouldn't want to drive it. It's such a nice cruiser

Last edited by TTOP350; Feb 3, 2025 at 04:40 PM.
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Old Apr 12, 2025 | 08:19 PM
  #186  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

FB has reminded me that this car has been backnon the road for 10years already.. sheesh
FB has reminded me that this car has been back on the road for 10years already.. sheesh
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Old Oct 9, 2025 | 09:17 AM
  #187  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Saw the 9bolt torson diffs were on sale for 100bux so I grabbed a couple from Amazon. Went back for a couple more but they were sold out.
This car will get one and i have another spare 9bolt that I'll be working on. It'll get a new diff and the set of 9bolt 3.70 GM gears i have for it.



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Old Oct 9, 2025 | 10:07 AM
  #188  
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Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
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Re: My 89 formula 350 ASC vert

They were $100.00 off or on sale for $100.00?
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Old Oct 9, 2025 | 11:57 AM
  #189  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: My 89 formula 350 ASC vert

Originally Posted by Airwolfe
They were $100.00 off or on sale for $100.00?
They were 100 bux for 1 unit. Must have been dumping stock.
wanted several more
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Old Oct 9, 2025 | 12:20 PM
  #190  
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From: Franklin, KY near Beech Bend Raceway, Corvette Plant and Museum.
Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: My 89 formula 350 ASC vert

Man, that is a great deal.
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Old Oct 9, 2025 | 12:56 PM
  #191  
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Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: My 89 formula 350 ASC vert

Originally Posted by TTOP350












NOS top looks to be correct as can be.
The top currently on the car was replaced in 1996

Man, I'd love to find an original top!
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