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You can also fit a 38/38dgas on that same bolt pattern.I'm running a 32/34 with a 90 degree adapter and I'm starting to wonder if this is the cause of my car being such a dog. What carb are you running? Anyone running a 36/36 ?
NorCal,
I think what you are considering, eliminating the spacer, has been tried and wasn't directly workable. IIRC, the problem involves the linkage. The Weber DGS carbs all seem to have linkage arms that rotate below the base of the carb. Further, being buried between the valve covers leaves no room to connect the linkage for operation. It's possible your riser stand is two pieces, one being about an inch thick with one or two ports. I don't remember what my Dad's Capri was like forty years ago. If you have such a part and retain it, you might succeed with that conversion. If you aren't that lucky, you will need to plan to fabricate a spacer to lift the carb enough to enable linkage function.
While linkage is under discussion, have you ever checked to see if your carb linkage will completely open the throttle butterflies by operating the foot pedal?
In Cali, are you subject to smog testing, due to your v6? Are you using the stock Ford air cleaner, or the small rectangular Weber air cleaner?
Was the Capri rear axle installed at the same time as the engine and trans? Do you know what ratio is in your rear axle? What size wheels and tires are installed on your Alpine?
If you could post some pics of your carb, distributor, and I presume, your vacuum hose connections, someone might see something else to discuss.
I am pretty sure the larger 2bbl intake on the 75 to 77 capri/mustang 2.8 will take a holley 2300 which is a higher CFM than the smaller holley/weber carbs. The stock motorcraft 2150 is also higher CFM but not as good or tunable as the Holley 2300, which IIRC is half a 4150 4bbl.Mike Armstrong has the Holley 2 barrel. You also have the stock cam and exhaust manifolds. I wonder if you could use the 2.8 heads, Ranger or Offy intake with DanR's headers and the Comp cam?
Well, that could be the issue.; there is just not a lot hp/torque to be had out of that motor. I've owned a 6 cylinder '73 TR6, '63 AH3000 that would cream this car. My '64 Falcon Convertible I had with a 1bbl 6 cylinder / auto may give it a race.The 1973 Capri V6 was 107 hp? https://www.automobile-catalog.com/make/mercury/capri_mercury_1gen/capri_mercury_1gen/1973.html
Sounds like your starting point was not significantly more powerful than the stock Alpine engine.
Mike
It’s the stock Capri rear/gearing. Pretty high ratio as by 60 mph it’s humming.What is your rear ale ratio? Your talking carbs when maybe you should be looking at gearing. I have a feeling your gearing will nullify any hp you can with a carb change because you need low to mid range torque and carbs will deliver high rpm hp.
Bill
Don't know what a 90 degree adapter is, but the car should not be dog. Bill