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| | | Supreme Being
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Last Login: Today @ 3:30 AM
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| | Fellas, I am doing another Y -- have a good 292 block with what looks to be another set of "C" heads laying around the barn. Any chance a modified "C" head can handle a 1.92 intake and 1.64 exhaust, or is there going to be too much shrouding and just not enough room in the combustion chamber? Dan
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| | | Supreme Being
Group: Forum Members
Last Login: Tuesday, July 29, 2008 7:16 AM
Posts: 287, Visits: 511 |
| | Dan, Im not an expert on Y-block heads, but I can give you some general advice. Compare the relative width x height area of the intake and exhaust ports, and base the " ribbon area " of the valves accordingly. Ribbon area is the circumference of the valve head x valve lift. Circumference = head diameter x 3.1416. For example if your intake port area is twice the exhaust port area, the intake valve head should be twice the exhaust valve head, if they have the same lift. |
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Supreme Being
Group: Forum Members
Last Login: Yesterday @ 10:41 AM
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| Didn't flow testing by J. Mummert demonstrate that shrouding of larger intake valve prevents any benefit (stock "C" head flows as well as a "G")?
6 VOLTS/POS. GRD. NW INDIANA |
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| | | Supreme Being
Group: Forum Members
Last Login: Today @ 3:30 AM
Posts: 216, Visits: 1,207 |
| | Thanks for the info fellas - and the little reminder about Mummert's work. I guess I am trying just a little too hard. Maybe the stock C heads that I have are just the way to go... Dan
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