I wouldn’t swap pistons without accurate comparative measurements of all the relevant parts.
Lapping the heads/barrels can’t hurt.
Might be worth trying a crack detector spray on the front head.
Does it make a difference where on the front head you spray carb cleaner? from the description it still sounds like a leak around the front manifold when hot is most likely to me.
Last edited by slob; 24-04-2020 at 09:49 PM..
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