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Moderator
Join Date: Dec 2007
Location: Sunny San Diego
Posts: 9,025
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Not only do you need to block the vac line to the diverter, but also the large hose that goes back towards your firewall. Not sure if this is your case, but when I put a US engine in my 4.5 Euro. I had a huge air leak there as the Euro heads were plumbed different than the US heads.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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