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Mine lights off instantly... I think the new fuel boils off due to engine heat.. In a modern fuel injected car where the fuel is injected & the fuel is always pressurized it's a non-issue but a carburator where the fuel sits on a hot engine....I've blocked the crossover & added a heat shield...

http://images.google.com/imgres?imgurl=h...sa%3DN%26um%3D1



This solved my buddy's starting problems so I tried one on my 440 air grabber. Had to remove it as there is not enough clearance.

I'm going to try blocking off the heat risers and add a thin aluminum spacer with 2 gaskets.