Discuss what year 302's had forged pistons? on AllFordMustangs.com, the place for Mustang enthusiasts.
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There are two types of OEM pistons: cast aluminum and forged aluminum. The "cast" or "forged" just refers to how the piston is formed, i.e. one is cast into a mold and one is forged (forced) into a mold.
Cast means molten aluminum is poured into a mold.
Forged means a chunk of aluminum is forced into shape by a (massive) press.
Late '92 (model year) and up pistons are cast hypereutectic aluminum.
Originally posted by GreyLX306 at The Corral: The term "hypereutectic" means that the mixture of silicon in the aluminum exceeds the eutectic point. The eutectic point is the exact mixture (12.6% silicon in aluminum) where solidification of occurs completely at the eutectic temperature (around 550 degrees celcius in Al Si), and in turn forms a lamellar structure with optimum dispersion strengthening. With more than 12.6% silicon, the silicon begins to solidify as the alloy cools, but before the eutectic temperature is reached, thus leaving patches of pure silicon despersed throughout the alloy.
1979-1993 Fox Capri and Mustang VIN Decoder: foxchassis.com
2014 V6 Deep Impact Blue Mustang, Borla Type S, 2.73 (Uughh need 3.73) 1989 Sonic Blue Mustang LX Coupe, 349 ci, 392 rwhp 424 rwtq....Mustang Dyno "There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -Will Rogers-