Quote:
Originally Posted by nota
the Penske Ilmor (Mercedes) motor was allowed the extra boost under old INDY rules
not CART rules for stock block pushrod motors
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This is an excellent point.
However, remember, the reason this door was open for Penske is that USAC took away the requirement that the engine be a stock block. Purpose-built 2 valve pushrod racing engines were allowed for the first time in 1994 and were treated to ten extra inches of boost.