Best way would be to buy an aftermarket manifold, several companies make them, everything from 2 or 4 barrels to multiple carb setups. Headers would be in order too, gotta get the air out after you burn it...
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1966 Fastback
1997 V6 Mustang
1998 GT
"Government is not the answer to our problems, government is the problem."
I have an old Mustang magazine from 80 or 81 where they had an article for hopping up the 6 cylinder. Their suggestion was to machine the factory intake to accept a Ford 2 barrel, or to machine it to accept two more 1 barrel carbs, so you'd have a tri-power. Looked pretty slick!
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66 Coupe - CandyApple Red, 2 barrel 289, C4.
66 Coupe - (father-daughter project). Tangier Orange, 302 with AOD, 17 inch Bullit wheels.
69 F-100 - 351c. Emerald Green Metallic paint. Still "in progress".
68 Barracuda - Rusted out project. 318 in the frame rails for now. Maybe a 360 in the future.
00 Mustang - (son's car) V6, 18 inch Saleen wheels.
I don't know how anyone can install an intake manifold on the factory 200 I6 cyl head. The intake manifold is cast as one piece, it is part of the cyl head.
I've seen where adaptors have been installed from the one barrel port on the intake/head to a two barrel carb, but this is really a waste of time and money. You can only pass so much air/fuel into the bottle neck one barrel port. I've also seen the deal where two additional one barrel ports were machined into the intake/head. Expensive operation with so so results if you ask me. The small exhaust porting and the two center exhaust ports with the siamesed arrangement are restrictive and will do a good job of negating any intake mods.
Classic Inlines has just introduced a really nice cylinder head with a separate intake manifold. There are several intakes available all the way up to fuel injection. This stuff was designed with performance in mind and in my opinion is the only way to go if you are serious about getting your six to really wake up. There is also an Australian Ford cyl head that has a separate intake manifold arrangement, but I'm not really sure it would be any cheaper than the Classic Inlines set up.
By the time you have gotten the machine work and porting, the valve job and necessary center exhaust port separation work along with throttle linkage set up on your intake/head, you've probably spent enough money to buy the good stuff also.
Both the machining operations (to add a 2 barrel, or to add two 1 barrels) are inexpensive if you already have the head off for a rebuild, and will make a drastic improvement. As crappy as the exhaust is, the stock intake is even worse, any improvement on that side will be immediately noticeable.
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66 Coupe - CandyApple Red, 2 barrel 289, C4.
66 Coupe - (father-daughter project). Tangier Orange, 302 with AOD, 17 inch Bullit wheels.
69 F-100 - 351c. Emerald Green Metallic paint. Still "in progress".
68 Barracuda - Rusted out project. 318 in the frame rails for now. Maybe a 360 in the future.
00 Mustang - (son's car) V6, 18 inch Saleen wheels.
Hey Greek I figured I could do with a really big drill bit and my dremel.. yes? no? hehehehe.
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66 Coupe - CandyApple Red, 2 barrel 289, C4.
66 Coupe - (father-daughter project). Tangier Orange, 302 with AOD, 17 inch Bullit wheels.
69 F-100 - 351c. Emerald Green Metallic paint. Still "in progress".
68 Barracuda - Rusted out project. 318 in the frame rails for now. Maybe a 360 in the future.
00 Mustang - (son's car) V6, 18 inch Saleen wheels.
The 250 cu in six has a head with a separate intake manifold. This engine was installed on Mustangs from 69 to 73 and other cars until 1976. The head will fit on all of the small block sixes (144, 170 and 200).
Classic Inlines, www.classicinlines.com offers intake manifolds for the head and they offer them for several different carbs and one for fuel injection. As for finding a 250 head, that's probably worth a walk through a U-Pull-It yard. If nothing can be found, do a yellow pages check for a yard that specializes in Ford parts. They shouldn't be that hard to find.
The February 09 issue of Mustang Monthly contains an article that is about the new aluminum head and the intake manifolds offered by Classic Inlines. It's a pretty interesting read. The issue should be on the newsstands right now.
The 240 is the big block 6. The 240 and the 300 will not interchange with the 6 that came in the Mustang, which, I guess, would be considered the small block 6.