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Even though it's a pain at times, I always make a point of checking the lash hot. That's what the engine actually sees, so it makes the most sense. Eliminates the guesswork.

Minor lash variations can make some significant horsepower swings(both ways) on some engines, so it's always a good idea to have this ironed out.

MB

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X2...... The way I explain it is that since the aluminum expands so much, it's actually pulling the rocker arms away from the block......