Cylinder Head Clearance question?? - Team Camaro Tech
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post #1 of 4 (permalink) Old Apr 16th, 02, 02:20 PM Thread Starter
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Join Date: May 2001
Location: Mass
Posts: 252
I am going to be changing heads soon..I want to go with 64cc heads with 206/190 valves...The original builder of the engine tells me he ran KB domed pistons with valve reliefs..The builder states that the KB setup recomended 64cc heads to acheive a 10-7-3 compression..But when the cam was changed so was the were the heads to 76cc...Do you guys think I am going to have clearance issues if I go back to 64cc..Would running the KB domes with 64cc heads and a 5.15 lift on the cam..Be to much..Thanks in advance
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post #2 of 4 (permalink) Old Apr 16th, 02, 07:24 PM
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Join Date: Feb 2002
Location: Williamstown,PA
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Everything I know about small blocks tells me with a 64cc head and flat tops you get around 10:1 compression. I'm running 58cc bowtie heads with flats and getting about 10.8:1. With a .100 dome and a 64cc head in a 350 you're looking at about 11.5:1, a liitle less in a 327 and a little more in a 400. If you're planning on running pump gas stick with the bigger heads.

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post #3 of 4 (permalink) Old Apr 16th, 02, 10:45 PM
Join Date: Oct 2000
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In my opinion, duration is as important as lift when it comes to piston to valve clearance. Maybe more so.
You could always mock it up with the new heads to make sure you have enough clearance.
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post #4 of 4 (permalink) Old Apr 17th, 02, 02:43 PM
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Location: San Francisco, CA 94114
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I run 64cc heads with '69 Z28 domed pistons and a .524" lift, 254 degrees duration camshaft. The only way to be sure is to bolt the heads up and do a valve drop 10 degrees before and after TDC. I had plenty of piston-to-valve clearance, but the modern combustion chamber shape required a short spark plug to keep from hitting the piston domes.
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