Cleveland style heads for the 4.125 bore blocks...

[Mus408]

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]

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]

Originally Posted by Mus408

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.