11-23-2007, 03:05 PM
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CC Member
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Join Date: Aug 2004
Location: Rosamond,
Ca
Cobra Make, Engine: FFR, 331 Sportsman block, T5Z, 3.55 IRS, Fuel Safe cell
Posts: 97
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Not Ranked
If you are only going to use the car for your stated mileage, the non hardened iron seats will last you about 5 or 6 years. The problem is that unleaded gas doesn't have lead, and one of the benefits of leaded gas is that it is easy on valve seats. The unleaded gas will tend to erode the seats over time. But the key word here is time. If it's going to be a daily driver, get the hardened seats installed.
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FFR, 331 SBF dynoed 372RWHP@ 6100 RPM on 87 octane pump gas
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