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The cylinder head for the 542ci Holley Roadrunner would be Indy's 440SR head. Using 906 castings as a baseline, the 440SR is Indy's first step in terms of a performance gain with its extensive line of Mopar-specific B/RB cylinder heads. Designated a street/strip head, the 440SR is the closest thing to a stock replacement that Indy offers. It doesn't require an offset rocker arm--any 906 style rocker will work, as will any intake manifold in the aftermarket.
1969 Road Runner Project, Part IV

 The cylinder head for the 542ci Holley Roadrunner would be Indy's 440SR head. Using 906 castings as a baseline, the 440SR is Indy's first step in terms of a performance gain with its extensive line of Mopar-specific B/RB cylinder heads. Designated a street/strip head, the 440SR is the closest thing to a stock replacement that Indy offers. It doesn't require an offset rocker arm--any 906 style rocker will work, as will any intake manifold in the aftermarket.  View Related Article

 

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