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Old 08-10-2010, 06:52 PM   #125
Ol' Ron
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Join Date: May 2010
Location: Chester Vt
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Default Re: Boring a flathead

Yes, the late 49 to early 51 blocks usually come with hardened seats in the exhaust and a 1.72 chevy valve can be used in the intake. Keep the 1.5 in the exhause. This is about max for a street engine. I would even undercut the valve and maybe use a 30 deg seat. Back in the 50's we used De Sota and Chrysler valves. Often wondered how well they worked.??
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