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1985 Z28 L69 Conversion

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Old 06-15-2017, 09:38 AM   #1
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1985 Z28 L69 Conversion




In 1985, the L69 option was only available in the IROC and not the base model Z28. I have fixed Chevrolet's marketing oversight.

https://youtu.be/Fle9A6RC1E8

Last edited by Ja85z28; 06-15-2017 at 04:10 PM.
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Old 06-15-2017, 09:41 AM   #2
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Re: 1985 Z28 L69 Conversion


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Old 06-15-2017, 09:43 AM   #3
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Re: 1985 Z28 L69 Conversion


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Old 06-15-2017, 04:09 PM   #4
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Re: 1985 Z28 L69 Conversion

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In 1985, the L69 option was only available in the IROC and not the base model Z28. I have fixed Chevrolet's marketing oversight.
video and modifications write-up
https://youtu.be/Fle9A6RC1E8
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Old 06-15-2017, 08:52 PM   #5
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Car: 1G1AP87G4EL220449
Engine: L69 V8 305 4BBL
Transmission: MK6 5 SPD MAN TRA
Axle/Gears: GT4 373 RATIO AXL

Re: 1985 Z28 L69 Conversion

That's a pretty sweet car as it came from the factory. Be sure to save all the original parts. But the conversion is fun and not irreversible should that day ever come. Thanks for sharing.
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Old 06-15-2017, 08:54 PM   #6
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Re: 1985 Z28 L69 Conversion

^^^^^100% correct
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Old 06-15-2017, 09:14 PM   #7
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Re: 1985 Z28 L69 Conversion

That is such a nice car!
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Old 06-15-2017, 09:48 PM   #8
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Re: 1985 Z28 L69 Conversion

It's a 5 Speed
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Old 06-15-2017, 09:50 PM   #9
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Re: 1985 Z28 L69 Conversion

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Old 06-16-2017, 08:18 AM   #10
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Re: 1985 Z28 L69 Conversion

One of my favorite cars on this board. Very nice I love it!
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Old 06-17-2017, 09:06 AM   #11
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Re: 1985 Z28 L69 Conversion

Car looks great I love Irocs but 85-87 Zs with silver gold and especially dark gray gfx and wheels are never seen. Love them
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Old 06-17-2017, 09:52 AM   #12
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Re: 1985 Z28 L69 Conversion

Nice car, looks great and sounds great! I believe these are your mods

Aerohead Racing prepared 601 heads 1.94/1.50 valves gasket matched bowls blended, K1103 cam, roller rockers, and SLP Y-Pipe, "free flowing" catalytic converter, 3" exhaust pipe, and Flowmaster muffler. 56,700 original miles
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Old 06-17-2017, 10:38 AM   #13
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Re: 1985 Z28 L69 Conversion

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Originally Posted by burnout88 View Post
Nice car, looks great and sounds great! I believe these are your mods

Aerohead Racing prepared 601 heads 1.94/1.50 valves gasket matched bowls blended, K1103 cam, roller rockers, and SLP Y-Pipe, "free flowing" catalytic converter, 3" exhaust pipe, and Flowmaster muffler. 56,700 original miles
It's now sporting a Cliffs Performance CC Carb. An amazing performance upgrade. My next upgrade is gears thinking seriously about 4:11. When you multiply 4.11 x .63 (5th gear) and then 3.73 x .63......there's a 200 rpm difference at 70 mph.
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Old 06-17-2017, 10:39 AM   #14
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Re: 1985 Z28 L69 Conversion

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One of my favorite cars on this board. Very nice I love it!
Thank you so much for such a sincere compliment.
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Old 06-17-2017, 11:10 AM   #15
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Re: 1985 Z28 L69 Conversion

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Originally Posted by mrestrictrplate View Post
Car looks great I love Irocs but 85-87 Zs with silver gold and especially dark gray gfx and wheels are never seen. Love them
I am the 2nd owner. The original owner negotiated with the dealership to paint the rims black. He took such immaculate care of the Z28. The rims will remain as tribute to his efforts.

Last edited by Ja85z28; 06-17-2017 at 06:46 PM.
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Old 06-17-2017, 07:22 PM   #16
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Re: 1985 Z28 L69 Conversion

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Originally Posted by burnout88 View Post
Nice car, looks great and sounds great! I believe these are your mods

Aerohead Racing prepared 601 heads 1.94/1.50 valves gasket matched bowls blended, K1103 cam, roller rockers, and SLP Y-Pipe, "free flowing" catalytic converter, 3" exhaust pipe, and Flowmaster muffler. 56,700 original miles
Did you get a compression increase using those heads?
I'll say it again - you made the perfect choices of upgrades for your car.
I can't wait to see what it runs in the 1/4, after you change the gears.
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Old 06-17-2017, 07:26 PM   #17
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Re: 1985 Z28 L69 Conversion

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Did you get a compression increase using those heads?
I'll say it again - you made the perfect choices of upgrades for your car.
The unshrouding of the valves in the combustion chamber increased the volume to 58cc heads with a .027 Cometics head gasket......swag calculations put the static at 9.75:1
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Old 06-17-2017, 07:29 PM   #18
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Re: 1985 Z28 L69 Conversion


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Did you get a compression increase using those heads?
I'll say it again - you made the perfect choices of upgrades for your car.
The unshrouding of the valves in the combustion chamber increased the volume to 58cc heads with a .027 Cometics head gasket......swag calculations put the static at 9.75:1
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Old 06-18-2017, 12:49 AM   #19
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Re: 1985 Z28 L69 Conversion

Was this car ever nominated for car of the month?
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Old 06-18-2017, 08:37 AM   #20
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Re: 1985 Z28 L69 Conversion

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Was this car ever nominated for car of the month?
No. I am genuinely grateful for the question.
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Old 06-18-2017, 02:50 PM   #21
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Re: 1985 Z28 L69 Conversion

Your nominated! Good luck hope you get it.
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Old 06-18-2017, 02:53 PM   #22
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Re: 1985 Z28 L69 Conversion

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Your nominated! Good luck hope you get it.
I am humbled by your nomination. Thank you Sir.
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Old 06-18-2017, 04:31 PM   #23
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Re: 1985 Z28 L69 Conversion

LOVE this car!!!!! ....I already nominated someone this month, but if I'm allowed, I'll "second" your nomination.

As for the car, man, I love it!!!!!!! ....As an Iroc owner, they've always been my true "favorite" but I've always wanted to build an 85-87 Z28 but give it the same treatment as my Iroc- "stock appearing" but upgrade some of the hidden goodies!

Gorgeous!!!!!!!!!!
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Old 06-18-2017, 05:04 PM   #24
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Re: 1985 Z28 L69 Conversion

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LOVE this car!!!!! ....I already nominated someone this month, but if I'm allowed, I'll "second" your nomination.

As for the car, man, I love it!!!!!!! ....As an Iroc owner, they've always been my true "favorite" but I've always wanted to build an 85-87 Z28 but give it the same treatment as my Iroc- "stock appearing" but upgrade some of the hidden goodies!

Gorgeous!!!!!!!!!!
Thank you for your nomination consideration. I am such a proud Papa! I too enjoy the "stock look" My Z28 idles just high enough to hide the little cam.
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Old 06-18-2017, 08:08 PM   #25
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Re: 1985 Z28 L69 Conversion

I would like to nominate his car also. Can I and/or how do I do that?
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Old 06-18-2017, 09:14 PM   #26
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Re: 1985 Z28 L69 Conversion

I ran DD2000 for you using flow numbers for Chevy Fast-Burn heads (about 215/150 cfm at .500"). Attached is what it came up with.
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1985 Z28 L69 Conversion-dd-ja-graph.jpg   1985 Z28 L69 Conversion-dd-ja-chart.jpg  
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Old 06-18-2017, 09:39 PM   #27
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Re: 1985 Z28 L69 Conversion

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I ran DD2000 for you using flow numbers for Chevy Fast-Burn heads (about 215/150 cfm at .500"). Attached is what it came up with.
I need to start shifting a little sooner, because I have been winding it to 6000. Even with a far less than optimal rear gear and that Cliff's Performance CC CARB it will float the valves quickly. I only did it once and had bad visions of pistons smacking valves.
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Old 06-25-2017, 11:16 AM   #28
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Re: 1985 Z28 L69 Conversion

Beautiful car! You should be proud!
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Old 06-25-2017, 11:19 AM   #29
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Re: 1985 Z28 L69 Conversion



Thank you for your kind words. I am retired and having a blast. Yesterday, a local Pepboys had a small Car Show and the Camaro won 1st Place!!!! The cool part was the Judge said, "It wasn't even close."

Last edited by Ja85z28; 06-25-2017 at 12:21 PM.
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