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HI all, just realized this forum page existed. I've been asking questions in the 1966 f100 forum regarding my engine. But this section seems like the place to be. I'm torn on two levels: financial and operability.
First, what I have. (Recently purchased and learning more and more everyday).
Financially - The engine runs strong as is, and I own the current installation, so not much in terms of additional cost other than an aftermarket electric choke and progressive linkage kit. Then tuning and all the small stuff. I don't know what size any of the internal valving/jets are (will take recommendations, it's on the list to find out I just haven't had time). Are dual 600cfm carbs too much for this engine if tuned/dialed appropriately?
Operability - I would like the engine to run well, and realistically a performance intake with a single 750cfm carb should be about right for this engine. But that costs money, and time, and more money. So if the existing arrangement is overkill by an absurd amount, how much could the dual 600CFM carbs and Weiand intake sell for to fund buying a new intake and single carb?
On a tunnel ram setup those carburetors should work pretty well. Progressive linkage is not the hot setup. Jetting requirements shouldn't be really any different than if you had one carburetor. One thing to check and make sure about is weather or not your carburetors are the emissions calibrated or the regular version of the carburetor. The emissions calibrated is far too lean to run well on today's fuel. This can be corrected with the right jet and rod kit from Edelbrock and you'll need two.
On a tunnel ram setup those carburetors should work pretty well. Progressive linkage is not the hot setup. Jetting requirements shouldn't be really any different than if you had one carburetor. One thing to check and make sure about is weather or not your carburetors are the emissions calibrated or the regular version of the carburetor. The emissions calibrated is far too lean to run well on today's fuel. This can be corrected with the right jet and rod kit from Edelbrock and you'll need two.
Interesting on the emissions calibration.
i plan to open one of them up and confirm the jets. I guess I’ll send a note to edelbrock to confirm that. Thanks!
im also looking to install an electric choke to help with those cold starts. Because the carbs are currently 1:1 (not progressive) I should only need one choke (?).
One choke should probably be enough. Cold weather performance will not be stellar with the carburetors way up in the cold air but overall tunnel rams can run just fine on the street in a high torque application. Just check the part number on the lower front corner of the carburetor. That will tell you the model and if it is one of the emissions models. With that said, I don't know if there are any manual choke versions that are also emissions calibrated but I'm not sure.
One choke should probably be enough. Cold weather performance will not be stellar with the carburetors way up in the cold air but overall tunnel rams can run just fine on the street in a high torque application. Just check the part number on the lower front corner of the carburetor. That will tell you the model and if it is one of the emissions models. With that said, I don't know if there are any manual choke versions that are also emissions calibrated but I'm not sure.
both carbs are edelbrock 1405. Came with the manual choke. Previous owner removed both chokes.
I think the electric choke will help, might be a high idle for a bit longer than normal but that’s ok. Will help keep it idling instead of me having to bump the gas pedal every 3seconds.
One choke should probably be enough. Cold weather performance will not be stellar with the carburetors way up in the cold air but overall tunnel rams can run just fine on the street in a high torque application. Just check the part number on the lower front corner of the carburetor. That will tell you the model and if it is one of the emissions models. With that said, I don't know if there are any manual choke versions that are also emissions calibrated but I'm not sure.
I also live south of Houston so “cold weather” is relative haha
I would spend the money and get it back to one carb with a H plane manifold (to street drive it) easier
Check the compression / use a borescope to see what pistons are in it
Harbor Freight has a cheap borescope that works
I would spend the money and get it back to one carb with a H plane manifold (to street drive it) easier
Check the compression / use a borescope to see what pistons are in it
Harbor Freight has a cheap borescope that works
Interesting, what in particular is the advantage of a single carb with H-plane intake? over dual carb with the tunnel ram.
definitely planning a compression check, never thought of a borescope (that sounds fun). also planning to measure stroke somehow (previous owner didn't know much about the engine, and based on what the previous, previous, owner had done already I wouldn't be surprised if it was a converted 460...wouldn't that be fun)
Drivability is all
I used a straw to check the stroke of the last two BBC motors I bought
Found the difference between the 454 and 427 cranks easily with that method
Drivability on the street is the only reason to run a stock type H plane intake
On the street you will be at or below 3000 RPM most of the time
Most dual quad tunnel rams are made for use above 4000 RPM IMO
Drivability is all
I used a straw to check the stroke of the last two BBC motors I bought
Found the difference between the 454 and 427 cranks easily with that method
Drivability on the street is the only reason to run a stock type H plane intake
On the street you will be at or below 3000 RPM most of the time
Most dual quad tunnel rams are made for use above 4000 RPM IMO
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