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Here's a tip - the cars are more stable, and thus almost always faster, with the long end of the block pointed down hill. His brother learned that the hard way.
Good to know. It will be hard to get enough lead into the front end to make it stable. Of course a majority of the weight should always go into the back, but I have noticed what happens if the front end is too light. The car will weave a little which isn't good. Anytime the wheels touch the track guide it slows the car down. We may start another car with the long end pointed down hill. Very cool cars. It looks like you have a Lego block for an engine on that Lotus. When I help kids other than my sons I almost always recommend a trough in the bottom so we can easily add weight.
Pinewood Derby, kids watch dads build beautiful cars .....real Pinewood Derby,mostly crude cars built and raced by kids as dad watches