Which is the better flowing head, D-port or twin plug - Ranger-Forums - The Ultimate Ford Ranger Resource


2.3L & 2.5L I4 Tech General discussion of 2.3L and 2.5L I4 Ford Ranger engines.

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Old 06-25-2006
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Which is the better flowing head, D-port or twin plug

Does anybody have the flowbench numbers on the D-port head and the Twin plug head, as to which head flows better out of the box and modified (no aftermarket heads, ie esslinger).
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Old 06-26-2006
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D port is the best flowing stock head. Dont have th flow charts though. Just have to take my word
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Old 06-26-2006
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Old 06-26-2006
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the best flowing factory head was actually the turbo head, but theyre a good deal harder to find... either way none of the LIMA heads flow very well and can do with some good machine work.
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Old 06-29-2006
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Now how do you know if you have a "Lima" head?

i've got a 2000 2.5Litre engine...
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Old 06-29-2006
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In 2001 in the middle of the year the 2.5 duratec came out, so your engine should have the late 8 plug lima head, also the lima had one camshaft (sohc) in the head while the duratec has dual cams (dohc). The duratec has a aluminum block and head, while the lima is all cast iron.
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Old 06-29-2006
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Quote:
Originally Posted by Kenneth S
In 2001 in the middle of the year the 2.5 duratec came out, so your engine should have the late 8 plug lima head, also the lima had one camshaft (sohc) in the head while the duratec has dual cams (dohc). The duratec has a aluminum block and head, while the lima is all cast iron.
wow! thanks for the info!

Ok, since we are on the topic of heads, is the flow rate on a twin-plug Lima head alright or is this a good item to get cleaned up?

Also, is that really expensive? I guess I should ask a machine shop that.
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Old 06-29-2006
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Quote:
Originally Posted by Kenneth S
In 2001 in the middle of the year the 2.5 duratec came out, so your engine should have the late 8 plug lima head, also the lima had one camshaft (sohc) in the head while the duratec has dual cams (dohc). The duratec has a aluminum block and head, while the lima is all cast iron.
2.3 Duratech. I'm pretty sure the block only bores to 1.8, 2.0 and 2.3
2001 was the last year for the twin plug 2.5 and the beginning of the 2.3 dohc Duratec
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Old 06-29-2006
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