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**Ricks1971** · 09-12-2007, 10:07 PM

There are 2 400 blocks one is a 511 casting and the other is a 509 casting. The 509 is the one that most people want as the way its designed there is not as much of a heating problem.

09-12-2007, 10:07 PM	#2
Ricks1971 Senior Member Join Date: Mar 2006 Location: Clarkrange Tennessee Posts: 1,787	Re: WIW- SBC 400 w/ TH400 There are 2 400 blocks one is a 511 casting and the other is a 509 casting. The 509 is the one that most people want as the way its designed there is not as much of a heating problem.