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Old 08-28-2002, 12:00 PM
kidvid's Avatar
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Post 289 smog heads?

I have three Ford 289 heads all with the same casting # C5AE,they do not have any air inlets for a smog pump. Two heads have smooth exhaust port walls. The odd head (a replacement) has a cast iron obstruction about the size of a 1/4" nut on a side wall sticking into the exhaust port. It is solid with smooth edges and no holes in it. The left side wall also seems to extend deeper than the other two.
Two Ford experts said they are two distinctive heads made by Ford eventhough they have the same cast #.That the one with the obstruction is a Calif. smog head and can not work with the other, as the flow is different.
My problem is,local parts recyclers are telling me that there is no difference in the heads. That
the one with the smooth ports must have been ported. They look stock to me with no evidence of machine work. I'm afraid to grind out the nipple for fear of hitting a water jacket.
Who do I believe? Or do I have a freak set of heads? Do I grind or not?
Any help would be appreciated.

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Old 08-28-2002, 01:07 PM
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i think i would try and grind off the 1/4" thingy. Or, better yet, get whoever sold them to do the grinding and then they can replace them if they screw them up.

"Well done is better than well said." - Benjamin Franklin (1706-1790)
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Old 08-28-2002, 03:02 PM
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Grind away, it is solid and you won't hurt anything.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

— Han Solo
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Old 08-28-2002, 09:22 PM
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Grind 'em, If you don't feel good about it, contact me, I can always use another set of "65" heads.
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Old 09-08-2002, 06:42 PM
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the ones with out the lump are probably early "65 heads the lumpy one a later. Ford ( like most cost concious manufacturers) standardized the heads when Calif. mandated the air pump and just didn't machine them on the 49 state models. Grind them bad boys out, it won't hurt and unless you're planning a racing engine,which would be flowed,the difference between the two wouldn't be noticed. The combustion chambers, if different, would have a bigger effect.
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