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Author Topic:   Ford Heads
acerace
Dirt Roller

Total posts: 6
posted April 03, 2004 10:53 AM  
Does anyone know the best flow heads for a 351w? The rules limit me to C90E head castings or later.

Special Ed
Dirt Full Roller

Total posts: 63
posted April 03, 2004 09:19 PM  
I would try and go with a set of "real" GT-40 heads like off of a Lightening truck or maybe a Mustang Cobra. The GT-40 "P" head is pretty good and relatively inexpensive but they are real hard to find headers for due to the plug angle.

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted April 04, 2004 11:19 AM  
the C9OE windsor will give you more compression than the GT-40 head, but the thermactor bosses in the exhaust port restrict flow. if your rules allow or the tech guys don't know much about fords, you can remove the bosses and it will be hard for them to notice unless they're ford gurus.

overall, i believe the GT-40 head flows a little better but if you're limited to a stock intake or exhaust manifold, then i'd opt for the C9OE casting. the intake manifold will run out of steam before the head does and the added compression will help.

as special ed noted, the GT-40P head has a weird spark plug location that may cause problems with conventional headers. it's also a good head if you can find a set of headers that will fit your chassis.

acerace
Dirt Roller

Total posts: 6
posted April 04, 2004 08:13 PM  
Thanks for the replies. I am limited to a stock 2 barrel intake but allowed to run headers. I know what I want to run but they wont let me!!!

pforsythe
Dirt Maniac

Total posts: 133
posted April 05, 2004 09:04 AM  
D0OE are virtually identical to the C9OE heads. you've got a good set.

Busch
Dirt Full Roller

Total posts: 46
posted April 07, 2004 07:40 PM  
Your problems may come in more on the ignition side of the equation than your heads. The old 69 or 70 model heads provide great torque and adequate power but the problem with no RPM will kill unless you gear for it

acerace
Dirt Roller

Total posts: 6
posted April 08, 2004 05:42 PM  
busch, is that because the limiting flow through the head? Because Im looking at running 6800-7000 rpms.

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted April 09, 2004 06:08 AM  
i've turned those old castings well over 7200......NOT with a stock intake though.....6500 is about all you're going to get with a stock intake...

Busch
Dirt Full Roller

Total posts: 46
posted April 11, 2004 06:58 PM  
Outlaw you may be on to something in all of the classes that we used stock heads in we were also required to use stock cast iron intakes We used both four and two barrels with different length spacers {our tech inspectors arent too bright} Anyway there are numerous different combinations that will really work well with a little lower RPM than the other guys run If you run a FORD you just have to use your head more than most of the other people do Be patient and you will succeed!

BUSCH

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acerace
Dirt Roller

Total posts: 6
posted April 12, 2004 06:02 PM  
Thanks a bunch with all the info. I think I have good direction to go now.

circledirt
Dirt Roller

Total posts: 22
posted April 13, 2004 06:32 PM  
Just some info, C is for 60's, D is for 70's, E is for 80's, and so on. Number after letter is what year casting done. C90E means '69, and D00E means '70. D00E has a 60cc chamber. E7,s have a 54cc chamber. Stock 69 to around 74 heads have 1.85 int and 1.54 ex valves. Valves got smaller after that until GT40 heads. 2.02 and 1.60 valves will fit with some machine work. I'm told a cam with up to a .500 lift will work with stock valves and spring, but I found a web site once that any lift over .480 was not needed. Good luck an dont forget to turn left.

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