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Old 03-28-2014, 12:48 PM   #1
Diputado
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Join Date: Oct 2012
Vehicle: 1965 Ford Mustang
Location: Puerto Rico
Posts: 177
Question Steam holes...to drill or not to drill?

Hey folks,

I've been researching aluminum heads for my 289 over the past several weeks, and have noticed that some (TFS, Edelbrock) recommend drilling "steam holes" in the block deck surface to match those that come on the heads, in order to avoid overheating problems, they claim. Others (AFR,etc.) apparently don't have these holes or recommend them. What's the deal here? Are there significant advantages to these steam holes? If so, why didn't Ford catch on way back and make them standard? Or, are they just unnecessary additional complications? Opinions...experiences?
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1965 coupe, 289 +.040, 10.5:1 forged pistons, Boss 302 flywheel, Weiand Stealth, Holley 600, Crane cam, Hooker headers, Duraspark ignition, Toploader wide-ratio 4-speed with Hurst Competition Plus shifter, and 9" rear with 3.50 gear.
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