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Dual relief case has bigger and better oilways, and 2 pressure relief valves. When the engine is in the car look up at the sump and you'll see either 1 or 2 large screws - the head is about 12mm diameter and you can use the screwdriver for opening paint tins on it :D

You can make a high performance motor out of a single relief case but a dual relief is a better base. My 1641 is built from a single relief case and is drilled & tapped for full flow with a filter and cooler. Runs fine :)
 

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I had a 1776 in a single case with a stock crank. Pushed my second bay along nicely for a few years. Probably still doing it now if it's been serviced properly.
 

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I have a question too about this. :)

Are all later cases dual relief ?

Or is it based on engine sizes too (ie are 1200`s all single still) ? :)

Or is it a year change thing ?
 

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It's a year change thing. All European made Bug engines from the start of the 1970 model year were dual relief.
 
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