I have a stock 250cid with C4 trans. I am interested in improving the performance while not killing the gas mileage. How much will a split header and 2.5 inch dual exhaust tubing with quiet mufflers improve the performance of this car. I'm not building a racer, just a fun car. Thanks, Ken
Check out fordsix.com .... but unless you do some serious head work, intake work, add a 2bbl carb, new cam, etc ... I would say you really wouldn't see any peformance increase ... would looke good though! I put a 2" exaust and flowmaster on my 250 ... didn't bother with the headers though ..
Thanks for the response. I don't know how restrictive the stock manifold is. A friend of mine had a header put on his Jeep with a 6 and swore there were major torque improvements. I don't know, if a K&N filter can add 10 hps gain, then a header should add 20 hps and tons of torque. LOL. I may just save my money and add a 2" exhaust and quiet muffler. Thanks, Ken
I have 1977 Maverick with a 250 six-banger. It has the Comp Cams High Energy 252 cam, Clifford ceramic coated header, and a stall converter in the C-4. It has the stock head and stock 1 bbl carb. I bought the car already equipped this way. I have a Holley 5200 2 bbl and adapter that I am going to put on the car. However, I am going to use another head and do some serious hogging out on the intake manifold and head ports. A stock 250 does not breathe enough to get the max advantage of how my engine is equipped. If Ford Six Parts ever comes out with their new aluminum head, that may find itself on that engine. Until that happens a 280 cfm 2 bbl and ported head and manifold will greatly improve the performance and the fuel mileage of the engine. It does have a good lopey sound to. I'd love to a 250 HP 250 ci engine.
Have you thought of using the 3x1 barrel carb setup? That is something I'm looking at. I think the air/fuel distribution would be greatly improved over a single 2bbl setup. It seems like the 1 and 6 cylinders would be lean and the 3 and 4 cylinders would be rich. Just thinking out loud. Ken
The problem with that is that you have to greatly modify the intake. On the 144, 170, 200, and 250 six bangers, the intake manifold and the head are one unit. Until Ford Six parts comes out with their manifold, the only heads that will work on these six cylinder engines and have interchangeable intakes are made in Austrailia and Argentina. They are very rare here and when you find one, you can pay as much $1,000 for one. Both Clifford and Stovebolt Engine Co, have adapters that let you use a standard 2 bbl or one of the Holley/Weber 2 bbl carbs (I'm using).
Doesn't offenhouser have an adapter? True you need to machine the manifold flat, and add 2 holes, but you will have a controlable mixtute. Ak Miller, in the 70's, did quite well with his 3x1 set up. Just 2 adapters and 2 144cid 1 barrel carbs. Not bad for a stock fuel pump. Ken
I've seen that done, 3x2bbls, don't know who made the adapters, but the cool factor is worth it. 3x2bbls with progressive linkage and a header would be sharp, something different from everybody else.....
I don't want to do all that to a 250 that is staying on the street. For overall performance and economy, a hogged out intake with a Holley/Weber carb is probably the best for the street. That carb is a progresive two barrel- small primary; big secondary - a la spreadbore. If I do anything to a stock "log," it will be to make it EFI. I would buy the parts and the computer from F.A.S.T, machine the intake for six injectors, and modify it to hold a 65MM throttle body (yep, I've been thinking about it). One more thing, if you go with the header for your six-banger, get the port divider for that middle exhaust port. It will make it two ports and increases the effeciency of the header.
Hey now I understand. Thanks. I'm talking a few hundred dollars and you are talking a few thousand dollars. I am spending the few hundred on my Maverick and the thousands are being spent on my 95 Lightning. I trying to get the most bang for the buck. Not the other way around. Ken
If you go with duals you realy shouldn`t use anything over 2" or you`ll more than likely lose alot of low end torque .
I think the 3 1bbl set up looks killer on a 6. I've seen them in person. If I ever get back to my convertible project, this is the current plan for it. As always, plans are subject to change.
Not really. I paid less than $120 for the adapter and the Holley/Webber 2 bbl. I'll spend around another $90 (Lokar stainless) on linkages and a Saturday getting all to work right. An EFI setup can be done to that enigne for less than a $1,000 of real cash. The real expense will be my time in the fabrication. I have access to and the knowledge to use the machines to make the injectors fit and to male an adapter for the throttle body. One thing to remember about multi-carb setups is getting the synchronization correct. I kike multi-carb setups. They look great and make great power. I think a 250 with an EFI will look just as cool in its own way. My goal with my 250 is to have better than stock power and way better than stock fuel mileage. I plan on an Explorer 8.8 rear end with 3.73 gears and AOD to help with quickness and the hwy fuel consumption.
That sounds like a very cool plan, Terry. I hope you get there soon. Ken, Take a look (and listen) to Mr. DMHines very nice setup in this thread: http://mmb.maverick.to/showthread.php?t=20088&highlight=dual+exhaust+cylinder Good luck.
The '77 should be out of the paint shop in about two weeks. Then Earl, Jamie, and I will put it back together. The 2 bbl is the next project after that. Then, hopefully, in time for Round-Up, I have the 8.8 rear and AOD in the car. I'd love a six-banger that will run a 14.9 1/4 mile and gets 27 mpg on the hwy.
