Depends where you live and the weather conditions. If you drive in the
cold, I'd leave them open. A warmer manifold will help with fuel atomization
in cold weather. If you're in perpetual summer like socal, leaving them
closed won't affect driveability. The comp manual recommends closing them,
because a cooler manifold, means cooler intake air temperature and thus more
air molecules in the cylinder yielding more power.
Steve
70' 1600
just taking up space in the garage.
----- Original Message -----
From: "Richard Brown" <reblues@reblues.net>
To: "Datsun Roadsters" <datsun-roadsters@autox.team.net>
Sent: Tuesday, March 11, 2008 4:04 PM
Subject: [Roadsters] U20 Head water passages
>I am cleaning up and assembling a U20 engine. The water passages from the
>head
> to the manifold have never been opened. I have searched and found
> recommendations for having them open and closed.
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