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-   -   Cleveland style heads for the 4.125 bore blocks... (http://www.clubcobra.com/forums/small-block-talk/97780-cleveland-style-heads-4-125-bore-blocks.html)

Mus408 06-20-2009 03:49 PM
Cleveland style heads for the 4.125 bore blocks...
 
Noticed at the dragstrip,that the guys running the Dart blocks,are using the various Cleveland style heads. For street/strip use,up to 6000 RPM, are the power and torque gains that great over a 225 style TFS or AFR head?

CobraEd 06-20-2009 06:11 PM
Great question, . . . I have always wondered the same exact thing. Also, . . if the canted valve heads are that good like in the cleveland and the big block chevy, why do all the new LS chevy (Corvette) engines not use them. They use-in line valves with very tall narrow ports. ???????????????????


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Jac Mac 06-20-2009 06:45 PM
Quote:
Originally Posted by Mus408 (Post 959888)
Noticed at the dragstrip,that the guys running the Dart blocks,are using the various Cleveland style heads. For street/strip use,up to 6000 RPM, are the power and torque gains that great over a 225 style TFS or AFR head?
For under 6000... No, but from there up to 9000+ yes they really start to turn the numbers, but if your going to try a stroker deal at those RPM you better buy a Big drip tray to stop the oil messing up the floor.:)

Part of the reason the LS heads 'look' so tall is the port enters the head at a steep angle so what you 'see' is not a true cross section area of the port, plus provision for the injector spray pattern is also made in the port casting at that point.


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