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Alan Roehrich · 11-27-2011, 08:31 PM

The 492 casting is the service replacement head for the "double hump" (186, 291, 370, 461, 461X, 462, etc) series of heads. It is available in straight or angle plug configurations, only the straight plug configuration is legal in traditional Stock Eliminator and Super Stock combinations.

The 292 casting is an angle plug "race" casting with the exhaust crossover blocked. It was called the "turbo" head because it was made for the Indy car "stock block' program, it is the predecessor to the "Bow Tie" series of heads.

11-27-2011, 08:31 PM	#18
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,118 Likes: 1,576 Liked 1,837 Times in 417 Posts	Re: SS/JA - What heads are legal? The 492 casting is the service replacement head for the "double hump" (186, 291, 370, 461, 461X, 462, etc) series of heads. It is available in straight or angle plug configurations, only the straight plug configuration is legal in traditional Stock Eliminator and Super Stock combinations. The 292 casting is an angle plug "race" casting with the exhaust crossover blocked. It was called the "turbo" head because it was made for the Indy car "stock block' program, it is the predecessor to the "Bow Tie" series of heads. __________________ Alan Roehrich 212A G/S