This tech tip/FAQ reveals the correct piston to cylinder wall clearance required for installing a set of Wiseco forged pistons in your turbo Dodge engine. Forged pistons require a totally different clearance profile than cast pistons and getting it right the first is very important. As they warm up, a forged piston will swell in diameter more than a cast piston and therefore the clearances will be different.

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https://turbododgeparts.com/content/faqs/turbo_dodge_weiseco_piston_specs.html