Ford 6.6L truck head? August 27, 2009 01:56PM
looking into building a 9000 for 3000rpm class my question is the 6.6L truck head comparable to the genesis head or is it a glorified 401 ag head? Also, are the intake & exhaust manifold any good?
Thanks in advance.
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Re: Ford 6.6L truck head? August 28, 2009 05:45AM
I think you will be better off with the Genesis head.
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Re: Ford 6.6L truck head? August 28, 2009 10:44AM
thanks Phil the reason im asking is i have access to three 6.6L engines and a 401 power unit engine. wanting to build a good combo with what i can get thats reasonably priced.
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Re: Ford 6.6L truck head? August 28, 2009 01:39PM
The truck head is by far better than the 401 head, not as good as genesis but still pretty good, I am using one off the 7.8
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Re: Ford 6.6L truck head? August 28, 2009 01:49PM
are all the truck heads the same between the 6.6L to the 7.8L? my next question is are the truck manifolds any good for pulling or is it better to use the ag manifolds?
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Re: Ford 6.6L truck head? August 28, 2009 02:17PM
I am running the truck ex manifold and the truck intercooler intake man. The ex manifold is ok, just a little work to get the turbo up on top, it mounts off the side. The genesis manifold will work, you just half to retap the holes in the head, top or bottom, cant remember witch ones.
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Ford Head August 31, 2009 02:56PM
I have been told that a stock 456 head will out flow a 401 with work done to it. What about the 7.8 truck head, which is better 474 or 456.
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Re: Ford Head September 01, 2009 11:12AM
from what i've been understanding is the 474 head is better for big cubes due to the large valves but has poorly designed ports, the 456 head is better for smaller cubes with the bigger than 401 valves and the best port design. correct me if im wrong that how I under stand it.
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Re: Ford Head September 01, 2009 11:39AM
from what I see you can't get much more valve then the 456-bore is still 4.4 stock in the 7.8 unless of course you bore out bigger! and maybe offset the valves-lot of work! don't know what valves are in a 7.8, I have one, just haven't the time to look into it yet. am sure others can tell you more!
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Re: Ford Head September 01, 2009 01:26PM
The 456 an 474 heads both have the same size valves. The valves on the 474 truck head are spaced apart more than the 456 witch works better with a big bore. The intake ports on the 456 head has better flow than on the 474 head do to the more stright port to the valve.
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Re: Ford Head September 01, 2009 01:53PM
I run a 474 head with stock bore and 2 inch intake valve and have another 474 head with offset valve guides with 2.2 intake valves which will work with stock 4.4 bore but Ive been told that a 456 head is still better due to the improved port design
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