4.3 vortec intake manifold bolt torque?
3 stage torque 2 ft lbs, 9 ft lbs, 11 ft lbs final.
According to GM, it used a one-piece intake manifold that combined the water outlet, exhaust heat riser, distributor mounting, oil filler, and valley cover into a single casting. The small-block Chevy was blessed with more displacement in its third year (the 162 horsepower 265 was still the base engine). A larger 3.875-inch bore brought the "Mighty Mouse" up to 283 cubic inches (4.6 liters).
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