Big Block oil pan fitment question

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Aug 14, 2025 | 01:58 PM

Mike_C

Thread Starter

4th Gear

Joined: Aug 2024

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Big Block oil pan fitment question

We have a customer with a 1972 corvette with a 454. One of the things he's considering having us do is install a crate big block. We're looking at a Blueprint long block. These crate engines use a 1 piece rear main seal. I was looking for an oil pan that will accommodate this as well as fit in the Corvette.
Can anyone offer any assistance with this?

Thanks

Aug 14, 2025 | 03:00 PM

SteveG75

Race Director

Joined: Jun 2000

Posts: 10,036

Likes: 667

From: FL

Milodon 31186 Stepped Sump.

I have the the 31188 version (two piece seal) in my 496. Great pan, 6 qt capacity, clears the stock PS components.

Aug 14, 2025 | 03:23 PM

Mike_C

Thread Starter

4th Gear

Joined: Aug 2024

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Quote:

Originally Posted by SteveG75

Milodon 31186 Stepped Sump.

I have the the 31188 version (two piece seal) in my 496. Great pan, 6 qt capacity, clears the stock PS components.

Awesome! Thank you so much!

Aug 14, 2025 | 08:03 PM

Corey_68

Team Owner

Joined: Feb 1999

Posts: 34,453

Likes: 665

From: Republic of Texas

Another option is Moroso's Road Race pan with a kickout sump. I ran this on my BB, you get ground clearance and the capacity.

Last edited by Corey_68; Aug 14, 2025 at 09:12 PM.

Aug 14, 2025 | 09:55 PM

wolfk

Instructor

Joined: Feb 2021

Posts: 242

Likes: 111

From: Augusta Mo

Milodon 31186 is 8.5" deep,
Stock pan is 7.75" deep
Check out Milodon 30975. It is 7.75" deep. We are currently using this pan on a customer's Blueprint 502 in a 73 c3

Aug 15, 2025 | 07:21 PM

SteveG75

Race Director

Joined: Jun 2000

Posts: 10,036

Likes: 667

From: FL

Quote:

Originally Posted by wolfk

Milodon 31186 is 8.5" deep,
Stock pan is 7.75" deep
Check out Milodon 30975. It is 7.75" deep. We are currently using this pan on a customer's Blueprint 502 in a 73 c3

My Milodon 31188 is no lower than my QuickTime bell housing. I like having the 6 qr capacity and the stepped design helps keep the pick up covered. I had a Moroso pan originally but would lose oil pressure on hard acceleration in 1st or 2nd gear due to the G forces and pickup becoming uncovered. Never an issue with the Milodon.

Aug 16, 2025 | 02:50 AM

ddawson

Le Mans Master

Joined: Mar 2001

Posts: 5,738

Likes: 644

From: Lincoln, CA

I used the Champ Mark 5 pan on my BP502. I removed the BP pan and then removed the installed wintage tray and oil pump.
I used a new oil pump and pickup that fits the Champ pan. I also replaced the studs that held the wintage tray.

Also there is no coolant sensor location on the heads so I used a thermostat adapter to screw the sensor into.

https://www.summitracing.com/parts/chp-cp209
https://www.summitracing.com/parts/CHP-208BB?rrec=true