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CNC ported Speedmaster Heads

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Old February 12th, 2022, 06:03 AM
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CNC ported Speedmaster Heads
Just got my heads back from Knowlton's Thunderheads. I am very pleased with their work. Flow from these heads is excellent.




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Old February 12th, 2022, 08:50 AM
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They are a known shop with Oldsmobile head experience. What did the CNC port cost? If you don't mind the question. They look really nice.
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Old February 12th, 2022, 10:54 AM
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Did they pressure test the water? I've heard stories....
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Old February 12th, 2022, 05:07 PM
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Good looking #’s.
What lift cam are you going with?
What’s the desired 1/4mile times?
-peter
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Old February 12th, 2022, 05:55 PM
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Cam will be from Mark R with lift in the .530's and mid 230's in duration. Engine in a 67 400 so the combo should make for a fun street car. Yes heads we're pressure tested as documented on the work order.
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