Oil Pan not flat

Hi
I need some help with my sump problem.

I have the RH LT1 conversion kit including the oil pan/sump. It is all fitted and running but the oil pan is leaking where it interfaces with the block.

After much investigation we have discovered that the oil pan is not flat thus allowing oil to escape especially at high revs.
The question is firstly has it ever been flat?
Secondly what would you suggest that we do?
It is obviously a custom item so if we buy a new standard sump then we will have to modify it to fit and after that hope that it hasn’t warped and that the mating surface is still flat.

Alternatively and I know it is a long shot – does anyone have a modified oil pan that will fit the LT1 or is it the same as the LS1?

Please advise a course of action.

Thanx
Q

Buy a new silicone gasket and put black rtv on both surfaces (block and oil pan). Your options are pretty limited with you being in the UK and having a LT1

Hi Spence
Many thanks for the reply but we are already on our 3rd substantial gasket (Felpro) not to mention copious ammounts of RTV.
What difference does it make being in the uk? I can import most things ok.
Q

Time and money I guess. Take it to a machine shop and see if they can straighten in.

Check your PCV system. If you are blowing out RTV and the gasket, seems it could be building a bit of pressure in there.

Also, do you have these installed?

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I used the Felpro blue gasket and found that it didnt quite seal the edges of the rear main cap. Used RTV at that spot along with the above "bars" to help cinch it all down.


No, LT and LS pans are different.

Hi 944-LT1
Yes I have the strips installed. We started with the blue gasket but found the Felpro brown was thicker and has reinforment. I aslo checked the breather valve and cleaned it. It's the one that is fitted to the rocker cover - yes?
The issue is quite clearly that the sump is not flat enough to make a seal with the block even with added RTV.
Thanx
Q

Can you get Yamabond no4 in the UK . Any Yamaha dealer has it. It made to seal case halfs on motorcycles but works great . I use it when assembling 2.5 Porsche motors never had a leak. I do endurance racing .

Hi, thanks for the sealing compound info.
The latest is that we actually bought a new standard pan and modified it here in the UK. We also used some liquid gasket (don't know the make is at the moment) but the result is that my garage floor is now oil free and I am not leaving an oil vapour trail under acceleration.
Thanks to all who helped with this.