Head question
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From: eugene oregon
Head question
What the difference between 04 and 06 tc heads.They show a different part number.I have a crack on my intake flange on my 04 roadking.I found a pair of 06 heads,will they work? Thanks
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06 heads should perform marginally better than 04 heads if both are stock. 06 heads have a little better exhuast port flow out of the box. you will need the 06 flanges part #26993-06. If you really want them to perform have the above poster wfolarry work on them. He is as good as they get.
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Certainly huge room to make moves on those, no doubt.
Scott
Last edited by Hillsidecycle.com; Mar 8, 2010 at 05:04 PM.
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From: san antonio
The numbers I have seem compared a set of '02, '05 and '06 heads. I think most agree that '05 heads performed the worst of any before and certainly after. Results are for .500" lift and at 10"; all heads were stock with stock valves
2002 = 118.4cfm
2005 = 115.5cfm
2006 = 126.5cfm
Different flow bench setups may produce different results but these heads were tested by a respected head porter/builder and the setup was the same for each casting. The test was doe shortly after the '06 heads were out and people started to notice the difference in the exhaust port. The results speak for themselves; the 2006 heads flow 9.5% better than the '05 heads and 6.8% better than the '02 heads. Your '04 heads probably flow similar to the 2002 castings. 6.8% may only be marginally better and porting would certainly improve performance but changing out to the '06 heads is a good move.
2002 = 118.4cfm
2005 = 115.5cfm
2006 = 126.5cfm
Different flow bench setups may produce different results but these heads were tested by a respected head porter/builder and the setup was the same for each casting. The test was doe shortly after the '06 heads were out and people started to notice the difference in the exhaust port. The results speak for themselves; the 2006 heads flow 9.5% better than the '05 heads and 6.8% better than the '02 heads. Your '04 heads probably flow similar to the 2002 castings. 6.8% may only be marginally better and porting would certainly improve performance but changing out to the '06 heads is a good move.
Last edited by djl; Mar 8, 2010 at 04:08 PM.
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