5.7L Third-Gen Engine Build - Balance Of Power :Decision '07
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These studs are painted red to illustrate the 72-degree angle of the center (heat crossover) intake-bolt holes in the heads and corresponding intake-manifold bolt holes on many of the '87-'92 TPI engines. The port bolts (foreground) are at the normal 90-degree angle to the mating surface, but for reasons known only to GM, the center two bolts in each head were drilled at 72 degrees on these engines, preventing the interchange of these heads and intakes with the earlier 90-degree small-block Chevy pattern. View Related Article
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