You may have to take one to a machinist to have this checked out, but the U20
piston is supposed ot have an offset piston pin. It's only offset by about .040"
so you can't see it by eye. See
http://www.gordon-glasgow.org/Images/U20_Piston_Sizing.JPG. I believe the offset
should go toward the spark plug side of the engine. Dennis/Tom/Dan, can you
verify this?
Gordon Glasgow
Renton, WA
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Pamela Pepoy
Sent: Sunday, April 08, 2001 3:41 PM
To: Datsun Roadsters
Subject: Proper Installation of Venolia Forged Pistons.
Greetings,
I am in the process of assembling the 1600 stroker. The engine has
Venolia forged (flat top) pistons. We are at a dead stop. Don't know
which side of the piston goes to the front of the engine. The stock
Datsun pistons have a stamp on the top of the piston to indicate the
front. The Venolia pistons have no mark on the top. Looking inside the
piston the word "Alcoa" is offset under the wrist pin. This could
indicate front or rear. Don't know which. I have a 50/50 chance of
installing the pistons backwards. The piston's skirt is thicker on one
side than the other. The Venolia name is stamped on the thick side.
The casting number is located on the opposit side that has the thinner
skirt. Does anyone know the proper orientation for the Venolia
pistons? Help. No instructions in the old box. Venolia has gone out
of business a while back. No guesses please.
This is a make or explode decision on the rebuild.
As alway, Many thanks.
Guy
Tempe, Arizona
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