Holley oil pan blues
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I’ve already installed a aluminum Holley 302-20 oil pan on my L83 and the drain plug that was with the kit is too small, it is an M12x1.75.
I called Holley to find out what size bolt the drain hole was tappped for, and the tech guy didn’t have a clue. He offered to exchange the whole oil pan kit but I really don’t feel like taking it off of the engine repackaging everything and going through the hassle of sending it back. I just want to buy a drain plug that will fit. It appears to be an M14x1.75 or M14x2.0 and neither of these are available. I found the closest SAE version...a 1/2”x13 tpi bolt and added a Teflon washer. It was a bit loose but seemed like it would hold a seal... I added the oil and noticed a drip, so I gave the brain bolt a little more torque and this bolt is still to small, as it will not grab enough material to hunker down. So.... my next idea is to drill and tap a larger size and move forward, but something in me cringes when I have to modify a brand new $325 part. If I do drill and tap new threads I’m thinking that would go to a 9/16 bolt. Should I go with a fine thread (20 tpi) or a coarse thread (12 tpi)? I have both taps already. Any idea where I can get an M14 flange bolt with a 1.75 or 2.0 pitch? Any suggestions before I cut new threads in this BRAND NEW oil pan?!! The plug on the right is what they provided, and the one in the left is a 1/2”x 13 tpi bolt. Both are too small. |
Re: Holley oil pan blues
Putting SAE bolts where metric bolts go is a bad idea. It never ends well. Now the threads in the oil pan are damaged.
My suggestion is to do what holley is offering. They are standing by their product by exchanging it for another one. Ask them to email a shipping label so you don't have to pay for shipping. Make sure the drain plug fits before you install the new pan. |
Re: Holley oil pan blues
Definitely the best advice S_Trucker, thanks. I'll most likely do that if I can't locate the correct bolt. I believe the damage to the threads in the pan are minimal and the proper fitting bolt will still work just fine.
Do any of you kind folks out there know who might have an M14 x 1.75 or 2.0 pitch bolt? |
Holley Oil Pan / Drain Plug issue
1 Attachment(s)
I’ve already installed a aluminum Holley 302-20 oil pan on my L83 and the drain plug that was with the kit is too small, it is an M12x1.75.
I called Holley to find out what size bolt the drain hole was tappped for, and the tech guy didn’t have a clue. He offered to exchange the whole oil pan kit but I really don’t feel like taking it off of the engine repackaging everything and going through the hassle of sending it back. I just want to buy a drain plug that will fit. It appears to be an M14x1.75 or M14x2.0 and neither of these are available. I found the closest SAE version...a 1/2”x13 tpi bolt and added a Teflon washer. It was a bit loose but seemed like it would hold a seal... I added the oil and noticed a drip, so I gave the brain bolt a little more torque and this bolt is still to small, as it will not grab enough material to hunker down. So.... my next idea is to drill and tap a larger size and move forward, but something in me cringes when I have to modify a brand new $325 part. If I do drill and tap new threads I’m thinking that would go to a 9/16 bolt. Should I go with a fine thread (20 tpi) or a coarse thread (12 tpi)? I have both taps already. Any idea where I can get an M14 flange bolt with a 1.75 or 2.0 pitch? Any suggestions before I cut new threads in this BRAND NEW oil pan?!! The plug on the right is what they provided, and the one in the left is a 1/2”x 13 tpi bolt. Both are too small. I also posted this in the Engine & Drivetrain forum. |
Re: Holley Oil Pan / Drain Plug issue
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I would think you would have better luck with this in the LSx Swaps forum. There are some very knowledgeable people over there. I will move it there for you. LockDoc |
Re: Holley Oil Pan / Drain Plug issue
OK. Thanks Leon!
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Re: Holley oil pan blues
yet another lack luster product and service from holley .......
and as said find the thread it is and get that bolt and be done with it . also side note : i was looking for oil pans for my ls swap when i am ready and the holley pans cost more than a gm original new pan of the same basic setup . |
Re: Holley Oil Pan / Drain Plug issue
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Re: Holley Oil Pan / Drain Plug issue
Try an oil change shop, they have "repair" plugs in various sizes. Some of them are cut similar to a tap on the end to cut new threads as they go in.
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Re: Holley Oil Pan / Drain Plug issue
How is it that I searched hi and low on the bolt depot website with zero luck??
Thanks Grumpy I’ll stop in a couple of oil change businesses on the way home, if no luck I’ll order from bolt depot! Thanks guys!! Brian |
Re: Holley Oil Pan / Drain Plug issue
Ahh... I found where I went wrong in my Bolt Depot search. The M14 x 2.0 is not available in the lower grade (8.8) so I assumed it wasn't available in the other grades also.
Anyways, 2 are on order now. Thanks again!;) Brian |
Re: Holley oil pan blues
Have you checked your local Napa for an oil pan drain plug? Last winter I found a drain plug there that I thought I was not going to be able to find. And yes it was metric.
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Re: Holley oil pan blues
Why not take the bolt to a hardware store and verify what you have with one of these? https://www.amazon.com/Horizontal-Ga...24938757&psc=1 Thread pitch gauges are cheap enough and handy to have around...
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Re: Holley oil pan blues
Sounds to me like you got a pan that wasn't drilled properly oil plug should be a 12x 1.75 which is stock next up from that is a 14x 1.50 I f it was me i'd let holly swap the pans out as your going to end up runnign into issuses down the road
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Re: Holley oil pan blues
also i megred your 2 threads together please remenber per form rules
XIV. Multiple Posting - It is simply not acceptable to post your question more than once, or to post it in more than one forum. Choose the forum that your question or post best fits in, and place it there and only there. If, after posting, you feel it should be in another forum, private message the forum Moderator and ask if they would move it for you. |
Re: Holley oil pan blues
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Thank you all for the responses, the 2 (I ordered a spare) M14x2.0 bolts are to arrive this Tuesday from Bolt Depot... I'll update after I try it out. |
Re: Holley oil pan blues
Future issuse if you dont get right thread or drill and tap it out it could end up striped out wrost and no lo g have holly support
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Re: Holley oil pan blues
Good grief....
The good news is the 2 M14 bolts with a 2.0 thread pitch from Bolt Depot arrived early. The bad news is they don't fit either. They only got 1 full thread in before it was obviously not going to work. At least it was only a 9$ mistake, the shipping cost twice as much as the bolts did. I'd like to blame it on the parts counter guy at O'Reilly, but that'd be a partial truth. It was an M14 x 1.50 all along. I'm guessing the first one I tried was not really the right one, perhaps incorrectly packaged? I stopped by the parts house again and picked up a different version of the same size drain plug and it perfectly sealed up tight with no thread damage. Thank the Lord. I don't know how my brain wasn't able to logically figure this out, which led me to ask you guys for help, but what a pain in the backside. I'm gonna call this my first official senior moment. Sorry to waste every ones time. Carry on. |
Re: Holley oil pan blues
Is there a heli coil installed? Sounds like it's missing. Easy to check
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Re: Holley oil pan blues
No helicoil... just threads cut into the aluminum pan itself.
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Re: Holley oil pan blues
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Clint |
Re: Holley oil pan blues
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Why would a new oil pan have a heli coil in it? I always thought they are used to repair stripped threads. Brian |
Re: Holley oil pan blues
Mis read it. Thought the drain plugs were 12mm x 1.5.
Clint |
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