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Old 08-26-2019, 08:29 AM   #6
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 10,407
Default Re: High compression head question

With the necessary clearance for valves on the L-head designs, they would be hard pressed to get to 7.5:1. This is why folks came up with the OHV conversions back in the day and some of those still only had intake valves in the head.

Poured babbitt bearings can take as much rough housing as any but they are a lot harder to replace when they wear out.
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