1994 Z28 questions
I'm absolutely in love with this car!
Hard top & mint interior.
Yea Yea yea - I know LT1

But she's far from stock. Technically its an LT4 now.
LT4 engine - Was told about 425hp at the crank.
- Forged Pistons, .020" over (5.8L 353CID)
- SRP, Full Floating, 11.1:1 Compression
- Forged Eagle H-Beam rods
- GM LT4 intake P/N 12550630
- Heads (Airflow Research, aluminum, 195cc intake runners)
- 1.6 ratio roller-rocker arms
- GM Performance Parts Camshaft 218/228 duration at .050", .525 lift, 112 centerline
- Moroso fuel pressure regulator
- BBK 52mm Throttle body
- Moroso cold air intake
- High temp coated 1 7/8” long tube headers, Custom 3”Y-pipe with 3” exhaust all the way back
- T-56 - all fresh and upgraded
- Center-force dual friction clutch
- SLP light weight flywheel
- Hurst billet shifter
- Custom light weight steel drive shaft
- GM 12 bolt, 4:10 gears, Eaton locker carrier, 32 spline axles.
I'm making her back to just a nasty street cruiser and car show trophy ho.
(3 so far this year
)She's defiantly fast as hell and can eat up a stock LS1 car.
So here's my questions.
First & foremost, I have ZERO OPTI spark issues, it was replaced when the engine was built, it has about 6K on it. The engine runs mint, so its more of a want than a need. Also I have no issues if I have to replace one, I have done so and its not that hard for me to do.
With that out of the way...

I'm thinking of the Torqhead conversion. I saw lots of older posts about this setup, so who is still running one now after years and miles?
Issues?
Besides the obvious about replacing the OPTI, OBD-II conversion & tune, what else did you see as a benefit?
Was it worth it in the long run?
I have read nothing but rave reviews about how great it was, after a fresh install, now I'm looking for those who have some miles and time on one.
Next question.
Speed Engineering true dual exhaust.
I have seen posts, and videos on putting this on an LT1 car. Who has done it, what did you do exactly to the driver side pipe (nothing but vague details on this).
Some said it was super easy to modify. Typically those were the links they had a lift to work under. I'm not that lucky.

I know the LS engine the driver side headers come out angled and the LT1 are straight out. That pipe needs to be modified a bit to make the fit.
From my research, this is the only real modification to the exhaust that is needed to install these pipes, and yes I have the Panhard bar kit already done.
Has anyone found a vendor that sells the pipe pre bent to adapt to an LT1 engine?
Has Texas Speed stopped making them and S.E. is the only vendor now?
All of the sound clips I have heard - OMG!!!!
So I'm looking for who has these or one of these questions on their car.
Thanks Gang!
My $.02 on switching from Opti to TH, if it aint broke don't fix it. There are 100's of thousands of Opti LT1/4 motors on the road with Opti. yeah the original AC Delco is the one to have and they are extinct now but if I had to buy an Opti today I would get the Petris one. IMHO the problem with Opti is the water pump weep home will **** on it and kill them. Go electric water pump. I did about 25 years ago and still have same opti, just replace the C&R like any distributor. I have 100k+ mi on my Meziere EWP and can change one in 10 minutes on side of road if ever needed (keep a spare in trunk)
If your 94 has a non vented Opti, I would convert to vented C&R

Luckily enough I never really broke anything on it that wasn't an easy fix.
I work very hard to repair and upgrade to make them reliable and great cruisers, and show cars.
Do I expect national show trophies... Nah
But taking Best Camaro 82-02 was a great day for me at a good sized 700+ car show.
My first trophy of the 2025 season - Top 50 award
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1979 G-Body Cutlass -Leaked like a sieve even after using bathroom silicone calk to attempt to seal them shut!
1984 Z28 - I replaced every seal, T-top center bar. Still leaked
1998 Z28 - this one surprised me - did not leak. Ran it through a conveyor car wash. Not a drop.
Just never been a fan of tops off or top down.
LOVE this hard top!
1979 G-Body Cutlass -Leaked like a sieve even after using bathroom silicone calk to attempt to seal them shut!
1984 Z28 - I replaced every seal, T-top center bar. Still leaked
1998 Z28 - this one surprised me - did not leak. Ran it through a conveyor car wash. Not a drop.
Just never been a fan of tops off or top down.
LOVE this hard top!
Trying to register one in Ireland and they won't do it without a stamped VIN to match the windshield VIN.
Desperate for help on this.
Spent hours with it on ramps looking and found nothing on the block or transmission.
Anyone know of stamped VIN on frame maybe.....or anywhere?
Thanks
NIce show, and awesome flee market and craft vendors market and has lots of cool things.
Great food, awesome drive down as well.
I hope to hit the cabin this year, and Friday nights @ Shriners more often.
I have gone to the Thurs night cruise in at the Baytown Plaza, do you stop in there?
Whats your ride bud?
At this point in my life, and level of daily backpain, she's gonna stay like she is for now. If something goes, then I'll look at upgrades and mods.
As for the money, unless the power ball hits for me, I don't have the extra to build the snot out of her.
I'll finish the suspension changes, and upgrades, fix the AC and minor oil leak, and just drive & enjoy her.
Strong Speed Works, has tuner options for this car and it doesn't require a OBD-II ECM.
You said - old AFR heads. They still sell these heads SBC LT4 heads I do see a one step upgrade they offer with a 210CC flow option.
Yes.. I'm aware the LT4 hot cam is a good entry level and there is a ton of better options.
If this CAM goes - I'll research out a better one.
She pretty fast, loud and good looking, that really all I need.

At this point in my life, and level of daily backpain, she's gonna stay like she is for now. If something goes, then I'll look at upgrades and mods.
As for the money, unless the power ball hits for me, I don't have the extra to build the snot out of her.
I'll finish the suspension changes, and upgrades, fix the AC and minor oil leak, and just drive & enjoy her.
Strong Speed Works, has tuner options for this car and it doesn't require a OBD-II ECM.
You said - old AFR heads. They still sell these heads SBC LT4 heads I do see a one step upgrade they offer with a 210CC flow option.
Yes.. I'm aware the LT4 hot cam is a good entry level and there is a ton of better options.
If this CAM goes - I'll research out a better one.
She pretty fast, loud and good looking, that really all I need.

My biggest advice is enjoy the car. If enjoying it is driving it, do that. If it’s taking it apart and putting it back together like a Lego set, do that. But my biggest advice is don’t take it apart and let it sit. Make it always ready to go, because if it’s taken apart and you let it sit, that’s no fun and you’ll resent it.
Nice show, and awesome flee market and craft vendors market and has lots of cool things.
Great food, awesome drive down as well.
I hope to hit the cabin this year, and Friday nights @ Shriners more often.
I have gone to the Thurs night cruise in at the Baytown Plaza, do you stop in there?
What's your ride bud?
With respect to rides, I had a black 1996 Z-28, purchased new, for 19 years, and for some crazy reason, thought the garage was getting overcrowded, so I sold it. I also have a 2001 Corvette, black, that I bought new in 2001. At least I had the sense to keep it, even though I only put about 1200 miles on it per year.....









