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Old 10-12-2018, 11:57 AM   #36
Jim Brierley
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Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,066
Default Re: High compression heads?

Just a comment, the pics posted by Jason, niggled, etc. appears to be more like a Winfield chamber. The original Thomas tended to detonate, Winfields did not. On dual plug heads, I ran a big Hall-Scott (5 3/5" bore) on a chassis dyno years ago. They had dual plugs, one on the left side of the head (OHV) one on the right. Each bank was on a separate switch. At idle there was a difference in RPM when one bank was shut off, at full throttle there was no difference in power!
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