I just had my 1975 straight 6 rebuilt - came out great. I replaced cam to get more HP. looking for advice for best carburetor, manifold, and exhaust combinations to get the best HP, torque, and sound. Am a newbie so I really appreciate any and all input.

 

Hello and welcome to the forums.

First off, which engine do you have? What is your intended use? What transmission? Tire size?
Are you looking for all out power? Gas mileage? Daily driver? These all make a difference.

This topic has been asked, discussed, and answered dozens (if not hundreds) of times. Check out the search function at the top of the page. It will more than likely return more information than you will need. :-x22

If you're asking about a 240/300 (which I assume) :

For starters, there really are only 3 intake manifolds available. The Clifford, the Offenhauser C, and the Offenhauser DP. Most go with the Offenhauser. A search should tell you the differences between all of them.

For exhaust, it's generally headers, or some manifolds from the fuel injected 4.9. The manifolds are regarded as a good way to go because they're inexpensive, easy to install/maintain, are stock and made BY Ford for the engine, and a vast improvement over the single log exhaust that came with the carb'd engine.

Carburetor: A 2 bbl carb, or a 4bbl carb. Your choice. A lot use an Edelbrock 500. The Holley 600 also works. Although, lately, I've had great success with the Holley 465, which I recommend.


Best of luck! Be sure to post up any specific questions you have.

 

AB,


thanks for your reply. how do I find out what engine I have? its a 300 inline 6. I plan on changing over to a 4 speed manual. currently its 3 on the tree. I chose to stick with my I6 rather than swapping out for a 352 specifically so I could get better gas mileage. that said, now that I have the smaller motor, I would like to get better power out of it. that was the reason I upgraded my cam. I am making a daily driver but the reality is it will not be my primary vehicle by a long shot. I will use it regularly but likely not more than 2x per week or so. always put away in the winter.


I was going to go with an edelbrock 4 barrel carb since the 2 extra barrels would only be used when I wanted it. can I buy these directly from edelbrock or do I have to go through a supplier? their website was pretty sparse when it came to figuring out how to buy from them. you like the holly over the edelbrock, it seems. why?


any advice given what I clarified above would be great.


thanks!

 

I was mainly asking about the engine to be sure you got the right information.

The 300 can definitely do much better on gas than it's large V8 brothers. There's also plenty of power to be had without too much mpg compromise.

For what you're looking for, you'd probably be fine with a set of EFI manifolds over the headers.

http://www.ebay.com/itm/300-4-9-Ford-1987-1996-New-Exhaust-Manifold-Set-/371283584684?pt=Motors_Car_Truck_Parts_Accessories&hash=item567239e6ac&vxp=mtr
You can also find some good deals on used, or even nab them from a junk yard for cheap. They don't normally crack, but it's always a good thing to check for if you get used.

A 2.25" or 2.5" exhaust out the back will also really help.

For the carburetor, most sites sell new Edelbrocks and Holleys.

http://www.summitracing.com/parts/edl-1403/overview/
http://www.summitracing.com/parts/hly-0-1848-1


It's not that I necessarily like Holleys over Edelbrocks, it's just what I've used. I tried several different carburetors, and recently switched to the Holley 1848 465cfm carb and it's just been great. I'm very happy with the results, so thought I'd recommend it. A 500cfm Eddy may do you great, especially if that's what you're more comfortable with.

 

Clifford actually has 2 intake manifolds. One for a single carb, one for dual carbs.

 

They also have one for three sidedraft Weber carbs.

 

Well yeah! However, those are usually for those that know that already know that's what they want.

 

Go with Fuel Injected Intake manifolds and remove all restrictions the the carb introduces!

Going this route will require a lotta learnin', cursin', and head bangin'. But the rewards are really worth it!

 

Actually they had 5 intakes:

1. Single carb.
2. Dual carb.
3. 3-2V
4. Triple side draft Weber.
5. Triple down draft Weber.



Don't know if they still offer more then the two now though.