rebuilt engine knocking?, engine builder says its normal for big bore 4's? Options

[narino]

Alright I understand these cars don't have the quietest, smoothest runnning engines made, but does this doesn't sound right to me. There is a knocking sound at startup until she's warmed up. Then it smooths out, not completely though still can hear the knock.

The engine builder, who builds racing type IV engines says that the noise is typical with big bore type IV engines. Here is a link to a video, what do you guys think?

video
http://www.narino.com/images/914-knocking.wmv

Here is what the engine currently has inside it: (originally a 1.7)

103 mm x 78 Stroke
2.0 H beam 5.325 (? no idea what this is was on the paper)
G - Cam
44 x 38 Heads

Thanks in advance!

(IMG:style_emoticons/default/beer.gif)

[McMark]

Also what deck height. I've seen an engine that had no interference when turning the motor by hand or at low RPM, but would kiss the heads off idle and tick-tick-tick.

[aircooledtechguy]

Also what deck height. I've seen an engine that had no interference when turning the motor by hand or at low RPM, but would kiss the heads off idle and tick-tick-tick.

(IMG:style_emoticons/default/agree.gif) I've seen this exact thing myself as well.

Before jumping to any conclusions though, get underneath it and ensure you don't have an exhaust leak at the heads or leak at the cylinders/heads. These types of very slight leaks can also have an almost metallic-type of sound as well, but are no problem to fix.

Also check the valve covers for the adjusters just kissing the inside of the covers. This is a common error when setting rocker geometry and installing 911 style adjusters (I assume that's what it's running).