C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

85 Z51 rack seal replacement

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Old Mar 19, 2026 | 04:16 PM
  #21  
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Originally Posted by colter
I bought the Lonestar Caliper from Texas A-pillar latex weatherstripping like a decade ago. And it was junk, the foam turned to dust via exposure to water. I had to coat it in black RTV to keep it from completely falling apart. Customer support was terrible as they essentially called me a liar even though I sent photos showing the foam cracking open and falling apart. They still sell weatherstripping, so have no idea if it's still latex. Or if they fixed their quality issues. I still have a factoyr b-pillar OEM latex weatherstripping on that has had small cracks that would let water in, and the OEM foam didn't turn to dust. I have though sealed those small cracks with black RTV to help keep water out though.

Wish they'd send me a replacement as I have had to do several RTV repairs coating it all, and last time I did a major RTV repair, the top is now stuck to it. As I went to remove the top, and it started tearing it open as the RTV has really stuck to the top. Just so anyone knows, the RTV was allowed to fully cure before putting the top back on. I just think the heat helped cause the cured RTV to really stick to the top. I plan on trying to remove the top later on, and will probably have to do more RTV fixing from any tears. But I bought some weatherstrip conditioner that I plan to put on the weatherstripping to hopefully keep it from sticking to the top.
I've heard good things about their steering rack rebuild services. I've never heard anything good about any weatherstripping that wasn't Corvette Rubber. Sucks about the customer service tho.
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Old Mar 20, 2026 | 11:40 AM
  #22  
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Doesn't Autozone or Standard Auto or Rock Auto carry the racks? They used to not too long ago, for about $250 if I recall (Installe a Woodward rack in mine, had a good 1986 Z51 rack for sale and nobody wanted to pay anything for it with a warranty reman unit being fairly cheap). Looked up Rock Auto and they have new units only for $400. Probably made in China but the OEM wans't any high quality unit either.
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Old Mar 20, 2026 | 11:43 AM
  #23  
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Originally Posted by AZSP33D
Doesn't Autozone or Standard Auto or Rock Auto carry the racks? They used to not too long ago, for about $250 if I recall (Installe a Woodward rack in mine, had a good 1986 Z51 rack for sale and nobody wanted to pay anything for it with a warranty reman unit being fairly cheap). Looked up Rock Auto and they have new units only for $400. Probably made in China but the OEM wans't any high quality unit either.

The z51 rack is more difficult to find, quicker ratio.
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Old Mar 20, 2026 | 12:16 PM
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Originally Posted by wolf_walker
The z51 rack is more difficult to find, quicker ratio.
Yeah, you never know what you get, some of the later model years (maybe 1989-1990 I think) were all 13:1 racks same as the earlier Z51 but they had longer arms. The 1991+ racks were all 15.7:1 even. They didn't seem to use the quicker racks anymore. Only way to check is if it's little over two turns stop to stop or little under two turns stop to stop.

The new racks should have a nice smooth bore, not sure if you can rebuild into a 13.0. Still cheaper than a re-build service, although there's probably some risk involved.

The Woodward rack I installed was 11:1 on the early C4 upright/spindle (lot of work to do that), so I get it.
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