The shop thats working on my car told me that i have 289 heads that were manufactured in california. I guess he thought that that made them special or something. The only thing i know about cali cars being different is smog equipment. With cali heads, is the compression ratio different or something? Or is this guy just a wacko?
Whats makes Cali. 289 heads different?
- Thread starter 65shlbycln
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12sec67
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LMan
Founding Member
Cali heads have air-injection passages into each cyl to burn leftover fumes and so on. I have a set, they are wonderful at holding my barn doors open 
65fastback2+2
New Member
They also each exert the same force needed to anchor your favorite boat 
But seriously, although I haven't examined a set, I would assume that they would also have the same or similar, EGR "bump" in the exhaust port that the 5.0 heads have, that restrict the flow. A little work with a die grinder would fix that.
But seriously, although I haven't examined a set, I would assume that they would also have the same or similar, EGR "bump" in the exhaust port that the 5.0 heads have, that restrict the flow. A little work with a die grinder would fix that.
LMan
Founding Member
actually, you will know they are true Cali heads if they have a small metal tube beside each spark plug hole. It is a restriction - I think they are worse than non-air-injection heads of the same vintage.
But they are every bit the equal in holding barn doors!
But they are every bit the equal in holding barn doors!
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