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Discussion Topic:
Is it true.....
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MG |
05-08-2011 @ 11:24 AM
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Senior
Posts: 1254
Joined: Nov 2009
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And this from Van Pelt's website: "In general, the latter year flatheads were commonly referred to as the "8BA" type for Ford and "8CM" for Mercury. The truck version was identified as an "8RT". Later 1952 and '53 Fords and Mercurys were known as "EAB" and "EAC" respectively. These markings are generally cast into the cylinder heads. The truck versions often had different oil pans to accommodate the different suspensions, and some truck V8's were factory "relieved". The EAB's and EAC's did not have the hardened valve seat inserts like the earlier engines." - My '53 has 'EAB' cast into it's heads and my concern is the integrity of the block being used as the valve seat as opposed to hardened inserts - this, with today's unleaded gasoline. I was just curious to know if Ford introduced these rotating valves to compensate for the lack of hardened seats or was it to cure a sticky valve problem, or both?
This message was edited by MG on 5-8-11 @ 11:48 AM
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supereal |
05-08-2011 @ 6:08 PM
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Senior
Posts: 6819
Joined: Oct 2009
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Sticky valves were not rare in the days of leaded gas, but rotators didn't seem to help much. The advent of oil with both detergents and dispersants did more to prevent that problem. We install hardened seats because most engines have had their cast seats ground several times over the years, leaving insufficient material for a correct and adequate valve seal. It was predicted that unleaded gas would cause seat erosion, but we haven't seen evidence of that. Once a block is set up in the machine, installing good seats is not a big deal. Given the cost of a quality rebuild, it is a very good idea, in any case.
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