'87 L98 broken windage tray stud
Thread Starter
Intermediate
Joined: Dec 2020
Posts: 26
Likes: 1
From: Lovingston, Virginia
'87 L98 broken windage tray stud
In the process of replacing my timing set and a bunch of other stuff, I removed the oil pan to replace the gasket. I removed the windage tray to have better access to clean the pan rails, and somehow managed to snap the drivers side stud towards the front of the engine. I thought I found the correct torque spec in my FSM, but apparently not. Can someone tell me where I can find good replacement studs? I'd like to replace all of them while Im at it. Is it as simple as using a deep socket to remove the old ones? And, does anyone know the proper torque spec?
Team Owner
Joined: Sep 2003
Posts: 25,398
Likes: 2,742
GM# 14091675 for '87 studs I'd think or an equivalent in the after-market. Where? - no idea!
** GM# 12561389 looks to be a GM supersession for that. Confirm with a GM parts department.
** GM# 12561389 looks to be a GM supersession for that. Confirm with a GM parts department.
Last edited by WVZR-1; May 28, 2021 at 10:53 AM.
Pro
Joined: Sep 2019
Posts: 716
Likes: 135
From: Buchanan, Michigan
The windage tray nuts should only be torqued to around 35-45 ft pounds. Not to be confused with the studs torque on the main cap, that's probably what you did, read it wrong and destroyed the end of the stud. Honest mistake, **** happens. 93-97 f body have a windage tray and a stud from one of them is probably identical. Not sure if the 96-2002 l31 vortec truck engine used a windage tray or not. Most junk yards have a pile of blocks that are set to be crushed, half the time the yard will just give you bolts like that if you take the time to remove it yourself. Could be worth a shot. Be advised that if you change them all to arp you must have the block align honed. So definitely find an oem main bolt/stud.
Safety Car
Joined: Jul 2003
Posts: 3,500
Likes: 879
From: Saratoga Springs NY
2024 C4 of the Year Finalist - Modified
2022 C4 of the Year Finalist - Modified
Boat engines have them. I should have some. Can you get a pic and measurements and I can look. Might be easier if you PM me if interested.
Pro
Joined: Sep 2019
Posts: 716
Likes: 135
From: Buchanan, Michigan
There should only be three (3) studs in an l98 tpi engine, the rest are main bolts. Unless you have reason to believe they've been over torqued, had a catastrophic rod failure there is no reason to replace the gm main bolts for up to 450-500 naturally aspirated horsepower. The oem bolts are actually very good quality. Many times guys will get arp for mild combos simply because the gm parts are more expensive, rest assured for a tpi engine, even one that's procharger or nitrous, the stock main bolts, and 3 studs for the windage tray are more than up to the task. Until you exceed 500 hp. It's your money, but personally I'd hate to see you waste it on things that will not necessarily add power or reliability bro.
Thread Starter
Intermediate
Joined: Dec 2020
Posts: 26
Likes: 1
From: Lovingston, Virginia
There should only be three (3) studs in an l98 tpi engine, the rest are main bolts. Unless you have reason to believe they've been over torqued, had a catastrophic rod failure there is no reason to replace the gm main bolts for up to 450-500 naturally aspirated horsepower. The oem bolts are actually very good quality. Many times guys will get arp for mild combos simply because the gm parts are more expensive, rest assured for a tpi engine, even one that's procharger or nitrous, the stock main bolts, and 3 studs for the windage tray are more than up to the task. Until you exceed 500 hp. It's your money, but personally I'd hate to see you waste it on things that will not necessarily add power or reliability bro.
Pro
Joined: Sep 2019
Posts: 716
Likes: 135
From: Buchanan, Michigan
It's just a 3/8-16 stud and nut if memory serves me right? If so common sense torque of 35-40 ft pounds will be fine for most 3/8-16 stuff. You must have torqued it to 75 pounds or more to snap it off. Honestly most small stuff like that I torque by hand and feel. The only exception is the cam gear bolts, I use a torque wrench on this. And rod bolts etc. Your mileage may vary, just my $.02
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 113
From: Michigan
I buy the bolt/studs on ebay for my project engines that don't have them or to add to more and use larger 5 bolt trays GM 14087508, here's the link for merchant that I bough some from last few times https://www.ebay.com/itm/402463534699
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Intermediate
Joined: Dec 2020
Posts: 26
Likes: 1
From: Lovingston, Virginia
Will this set work for my motor?
https://www.speedwaymotors.com/Speed...of-5,1753.html
I am trying to find somewhere that can get them to me quick, as I'd really like to finish this project before the weekend. Looking around, I am seeing studs with and without a washer flange nut. These are without. Does it matter?
Thank you to everyone who has responded.
https://www.speedwaymotors.com/Speed...of-5,1753.html
I am trying to find somewhere that can get them to me quick, as I'd really like to finish this project before the weekend. Looking around, I am seeing studs with and without a washer flange nut. These are without. Does it matter?
Thank you to everyone who has responded.
Team Owner
Joined: Sep 2003
Posts: 25,398
Likes: 2,742
The new GM I'd think likely on a dealers shelf for pick up!! Call the info to a dealer and let them check other local dealers. You get from a dealer singularly!!
There's 5 for $35 on eBay if you use the GM# 12561389
There's 5 for $35 on eBay if you use the GM# 12561389
Last edited by WVZR-1; Jun 1, 2021 at 12:11 PM.