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Old 03-11-2013, 09:09   #1 (permalink)
DJT
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Engine Upgrades, Waste Of Time/Money?

I am in the process of replacing the heads on my 03 Expedition and splurged on getting the oversized valves. Just wondering if anybody else has done this and if they saw any results? If not, then in theory was it a waste?
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Old 03-12-2013, 18:45   #2 (permalink)
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Re: Engine Upgrades, Waste Of Time/Money?

Yes, no, maybe? By utilizing over sized valves, you;re allowing the engine to breath easier, which will give you better horse power and better efficiency. The question is, do you have the clearance to accommodate these valves.
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Old 03-13-2013, 07:20   #3 (permalink)
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Re: Engine Upgrades, Waste Of Time/Money?

This explains head mods ,

Secrets of the Cylinder Head: Part 4 - Tech - Sport Compact Car Magazine
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Old 03-13-2013, 13:36   #4 (permalink)
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Re: Engine Upgrades, Waste Of Time/Money?

Thanks for the link, it was very informative. Can you please be more specific about the clearance question?
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Old 03-13-2013, 16:22   #5 (permalink)
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Re: Engine Upgrades, Waste Of Time/Money?

This article from Hot Rod pretty much explains it.

Checking Piston-to-Valve Clearance - Hot Rod Magazine
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Old 03-23-2013, 18:36   #6 (permalink)
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Re: Engine Upgrades, Waste Of Time/Money?

Assuming you have the 5.4L a lot can be done to those engines in terms of bolt on parts. To really make any modifications work well, and without worry of engine knock (the sensors can be overpowered under hard acceleration depending on the computer management) is installing a proper tune to get maximum performance out of the modifications, and perhaps some better cruising mileage.

To gain maximum performance with better breathing, a cold air intake (CAI) along with the heads, an aftermarket exhaust with better flow, and a proper tune to make it all work in harmony would be the way I'd go. It'll cost some bucks, but if you want performance it will help. Just don't think it will increase your mileage. Even if it does, you would probably have to drive 250K miles (or more) to see it pay off.

Without a tune, newer computer controlled engines will automatically regulate the standard stoichiometric ratio limiting the performance potential.
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