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Reply to "Wanted To Buy Headers for Cleveland 4V heads"

@Elliott posted:

Thank you, I didn't realize that they made heads with round ports. That makes much more sense, than round flanges on square ports.

Ford didn't on production iron heads. There are some in the aftermarket. My A3 aluminum "Ford Motorsports" heads do but they are also "raised ports".

"Gurney-Westlake" 289 heads also have round exhausts.

The iron 289 "GT40" heads might also have round exhausts but my memory on those is a little fuzzy? I haven't looked at those in years.



Header shapes are strange animals. I'm pretty sure that the exhaust port flow numbers are most useful/valuable with 3" radius "stubbies" bolted up to them.

Cleveland exhaust ports are more then a little strange anyway. Some testers have shown better numbers with smaller (1-3/4") tubes but the "drag" cars were using 2-1/8" tubes but they were "tuned" for different torque/hp/rpm characteristics.

There are some step tube headers that are a more modern design and squeeze more power out of the exhausts and 180 designs which may also use step size tubes.

That is a science all it's own and generic statements as to tube size can be harmful rather then helpful there.

On a competitive race car EXPECT to spend a lot on headers and exhausts and they are going to NEED to be made for you on the chassis/car, not generic headers.

Last edited by panteradoug
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