89 145 HP, but 90 has only 102? What was changed?

[1badmax]

You want 'stock,' ask Smokey Yunick, NASCAR and IndyCar constructor and mechanic, with GM backing, "what's stock?":

7 Hilariously Mad Racing 'Cheats' That Were All The Work Of Smokey Yunick (carthrottle.com)

Count those injectors, those cars had huge pistons and turbos, and they didn't burn gasoline. Offy power! Primed for battle in an IndyCar, the Offy could approach nearly 4 horsepower per cubic inch.

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That's what I meant by "everybody" has a different definition of stock...yeah Smokey's outlook was whatever he could get by with.