2V to 4V conversion


Hey all,
Just thought I would share a success story for once instead of just another problem. I recently upgraded from a 2V (2100 series) carb to a 4V (4100 series) carb on my 351 Windsor. The pic attached is the final result. You are looking at an Edelbrock Performer Series intake manifold, with a modified 1" carb spacer underneath an original 4100 Series Autolite carb. The spacer was needed so that the linkage would clear the fuel tunnel on the intake. The spacer was too high however to accommodate the air cleaner under the hood. Had a friend mill it down for me to 5/8". The 4100 carb is circa 1964 and the original linkage would not mate to the '69 throttle cable system. I used (and slightly modified) the linkage from my old 2100 carb to connect it all up. Then however, the kick down rod was too short to work properly. I purchased and installed one of the extension brackets that Holley sells. Spun the adjustment screw all the way in, and it works the way it should. The throttle cable bracket is not correct, but it seems to operate just fine. Rebuild kit for the carb and proper timing…and she runs like a champ. Just hope that this might help some one else out some day.
Cheers to everyone who has helped me when I needed it
Dennis

Thanks for posting, always good to see posts with experiences shared :smoke:

looks good and is probably a lot more fun now. can we get a picture of your engine bay? looks like you have some nice valve covers and other goodies under there as well

The view from above…

Have you thought about painting the air cleaner to match the valve covers? I would probably be too afraid to, but if you did a good job I bet it would look really good. As is it looks good though

Nice to see. Underhood clearance is definitely at a premium w/ these cars so it’s good to see you actually did get it to fit with the taller spacer. Now I’m a little more confident about putting an rpm intake on my 289. Did you use a divided wall spacer?

Tried to find a black one first, but they seem to be available only out of the USA (I’m in Canada, remember…). Shipping costs and brokerage fees are often more than the price of the unit. Needed one quick for a show, so I bought the gray one at a local speed shop to get me through. Black is the plan though…

No, standard square 1" (open) aluminum spacer. Had to machine a full 3/8" off the rise and also had to mill another 3/16" or so off the width on the linkage side to get the full throttle assembly to fit. The carb was from a standard tranny car, so getting the kickdown linkage on the slightly shorter throttle shaft was a challenge.

Be very careful with your hood clearance. Even now, with just the regular Performer intake (non-RPM), my air cleaner (15" long x 3" high) JUST clears the bottom of the hood. 1/4" or less, I’m guessing.

Anthem75 I’m north of the border as well so I feel your pain

Indeed sir…where exactly are you at?

Where about…?

outside of Vancouver, you?

Dang! You just sucked the hope right out of my last statement (LOL). Really with where the car spends most of the time rpm wise, the regular Performer would be just fine anyhow.

Just north of Calgary…

Some clay molding and a few drops of hand cleaner here and there on tight spots will always tell the tale of the tape nicely…

guitar 74 just cut a big hole in the hood. I hear all the cool kids are doing it

Guess all you have to do is “Eliminate” your problems…

I love those 4100s. They even had annular discharge before aftermarket carburetors did! Long ago I woke up a low-deck engine (289 2V) with the same treatment, aluminum Shelby intake and new in box 4100. Gosh, the 4100s just like to run crisp…

Any fans of the 4100 may want to check out the Summit house brand 600cfm carby. It is meant to have some of the features that people liked about the 4100s (eg. annular boosters) in a modern architecture:

I bought one on the strength of those claims and the overwhelming number of positive reviews. Haven’t fitted it yet…