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)

[narino]

Again, thank you guys for your replies.

Vacca/Root - glad to hear it.

Rick - I'm pretty sure he'd balance the assemlby again. But of course will confirm this with him. My mind assumed iron when he mentioned cast, but honestly I don't know specifically what material it is not that you bring it up. I'll ask about it as well.

Karlo - He did mention what you've posted. The power output was in a lower range for him to not worry about the definite need for forged pistons. As It's not going to be tracked, and my biggest concern was noise he thought this swap would be best for me.

I guess after the swap to cast pistons could I expect a slight performance drop as the pistons would be heavier and wouldn't rev as fast?

[VaccaRabite]

I guess after the swap to cast pistons could I expect a slight performance drop as the pistons would be heavier and wouldn't rev as fast?

If you are not pushing the car, I kind of doubt you will notice it.
But, I've been wrong before.

Zach