l82 350

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Apr 4, 2010 | 08:25 PM

wicho

Thread Starter

Cruising

Joined: Sep 2009

Posts: 12

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l82 350

i am building 350 79 l82 the correct rear main seal is one piece or two piece or which one is better . also high v oil pump vs standard thanks

Apr 5, 2010 | 12:17 PM

Rich's'78

Racer

Joined: Nov 2004

Posts: 485

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From: Oakville ON

The one piece seal was introduced in 1986. You will get different opinions on the pump. I went with slightly higher volume -> shows higher back-pressure.

Apr 5, 2010 | 01:53 PM

Shark Racer

Race Director

Joined: Jan 2000

Posts: 12,399

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From: San Jose CA

I think the one piece is more reliable but if it goes south you need to pull the trans to replace it, I'm pretty sure. The two piece is serviceable with the oil pan off. It will also require a different flywheel/flexplate.

Apr 5, 2010 | 02:15 PM

fauxrs

Le Mans Master

Joined: Nov 1999

Posts: 5,768

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From: San Diego CA

Quote:

Originally Posted by wicho

i am building 350 79 l82 the correct rear main seal is one piece or two piece or which one is better . also high v oil pump vs standard thanks

The correct seal is the two piece. The one piece is not retrofitable to an early block (to my knowledge) however there are methods by which you can retrofit a two-piece rear seal to the 1 piece block.

The 1 piece seal is generally considered superior at sealing however as mentioned earlier requires a different engine block, and flywheel or flexplate (changed bolt pattern radius). It also requires trans removal to replace.

A standard oil pump is all you should need, provided you run standard clearances.

Apr 5, 2010 | 03:53 PM

SteveG75

Race Director

Joined: Jun 2000

Posts: 10,045

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From: FL

Quote:

Originally Posted by Shark Racer

One piece is a different block design and different crank. OP needs a two piece.

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