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Heller

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Discussion starter · #1 ·
Hi guys,

during the installation of the Lunati Cams, the shop recognized problems with the heads (bearings) and replaced them by a pair of overhauled 09 GT Heads (different spark plug size). Since then I feel the engine performance a bit rough. At first I was pointing it at the high performance cams, but now the spark plugs popped into my mind.
What is the correct spark plug for this combination and more important, gap size?

Would be a pleasure if you could help me out!
 
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