"Buick and Oldsmobile each produced their own versions of the GM 215 cubic inch (3.5L) aluminum V8 with Pontiac fitting the Buick version. The Buick and Oldsmobile blocks both have bosses for 6 bolts per cylinder bore but the 6th boss is undrilled in the Buick. The turbocharged Olds 215 had beefier main caps than the naturally aspirated versions and used a water-injection system using "Turbo Rocket Fluid" which consisted of 50% water and 50% methanol. The cast iron crankshaft and forged…"
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