jas280z
Well-known member
- Joined
- Aug 7, 2015
- Messages
- 50
- Reaction score
- 0
- Location
- Buffalo
- My Car
- 1971 Mach 1 H code FMX Grabber Blue with 5W Deluxe White Interior
I just got back from Barrett-Jackson, and that has me itching to get ready for spring. Unfortunately, the Mach 1 is in storage, but I can start getting parts.
Currently the car has the original 1971 351 2V, with an Edelbrock 2750 4 barrel Performer intake and an old Performer 1406 carb. The car has 3.00 gears and an FMX, if that makes any difference. I may go to 3.25 down the road, still undecided.
This is my first go around with a carburetor. I was having a little issue getting it to run right last fall as the weather got colder. The carb that is on the car at the moment originally came on my Dad's 67 Cougar and sat in the garage for a few years before being re-purposed. I do not know what tuning was done to the carb before we got it, as far as jets or metering rods goes.
I want to get a new carb, so I know what I am starting with as a base-line. I plan to stick with Edelbrock, as everything is currently set up for it (throttle, Lokar kickdown, etc...). I realize that I can probably get the current carb to run right with enough time and patience, but being my first real experience I am more comfortable working with something fresh out of the box. I will probably attempt a rebuild and cleaning on the old carb eventually, but being in Western New York, I want to maximize my fun time with the car while the weather is nice.
I am trying to decide between two carbs.
An Edelbrock Performer 1405. Essentially a manual chock and performance tuned 1406 (current carb) which I would install an electric choke on. It would still be 600 CFM.
http://www.summitracing.com/oh/parts/edl-1405
Or an Edelbrock Thunder 1806, which I understand is pretty much a 650 CFM Performer with tunable vacuum secondaries. It comes pre-installed with an electric choke and I believe is also more performance oriented on the out of the box tune.
http://www.summitracing.com/oh/parts/edl-1806/overview/
If this was the end of my plans, I would stick with the 600 CFM, as that seems to be the sweet spot for a stock engine, from what I have read. But that is not my plan, over the next 2 years I would like to pull the engine and install a set of Edelbrock aluminum heads (61629) and likely an appropriate cam and headers. I also want to install a Ram Air setup, another reason for sticking with the Edelbrock, as I have read that it fits well with the Ram Air setup. With these upgrades, I am worried that I will have to up the carb game, to take advantage. If I am going to speed $350+ right now on a carb, I would like it to handle all future upgrades as well.
I guess my question is this… would a 650 CFM carb be too much overkill on an otherwise stock engine? Would it be right for my planned modifications? If the 650 CFM will be better long term, and not cause problems when stock, I would like to go with that. On the flip side, would 650 CFM be overkill even with my planned mods? I don’t want to over carb the engine. I see people going up to 750 CFM with 4V heads. The Edelbrock heads are a good mix between the 2V and 4V, with higher compression like the 4V, but valves closer in size to the 2V; that is why I am thinking the 650 CFM should be a good fit. I am not overly concerned with gas mileage, as this is a summer car. I am focusing on smiles per gallon.
Currently the car has the original 1971 351 2V, with an Edelbrock 2750 4 barrel Performer intake and an old Performer 1406 carb. The car has 3.00 gears and an FMX, if that makes any difference. I may go to 3.25 down the road, still undecided.
This is my first go around with a carburetor. I was having a little issue getting it to run right last fall as the weather got colder. The carb that is on the car at the moment originally came on my Dad's 67 Cougar and sat in the garage for a few years before being re-purposed. I do not know what tuning was done to the carb before we got it, as far as jets or metering rods goes.
I want to get a new carb, so I know what I am starting with as a base-line. I plan to stick with Edelbrock, as everything is currently set up for it (throttle, Lokar kickdown, etc...). I realize that I can probably get the current carb to run right with enough time and patience, but being my first real experience I am more comfortable working with something fresh out of the box. I will probably attempt a rebuild and cleaning on the old carb eventually, but being in Western New York, I want to maximize my fun time with the car while the weather is nice.
I am trying to decide between two carbs.
An Edelbrock Performer 1405. Essentially a manual chock and performance tuned 1406 (current carb) which I would install an electric choke on. It would still be 600 CFM.
http://www.summitracing.com/oh/parts/edl-1405
Or an Edelbrock Thunder 1806, which I understand is pretty much a 650 CFM Performer with tunable vacuum secondaries. It comes pre-installed with an electric choke and I believe is also more performance oriented on the out of the box tune.
http://www.summitracing.com/oh/parts/edl-1806/overview/
If this was the end of my plans, I would stick with the 600 CFM, as that seems to be the sweet spot for a stock engine, from what I have read. But that is not my plan, over the next 2 years I would like to pull the engine and install a set of Edelbrock aluminum heads (61629) and likely an appropriate cam and headers. I also want to install a Ram Air setup, another reason for sticking with the Edelbrock, as I have read that it fits well with the Ram Air setup. With these upgrades, I am worried that I will have to up the carb game, to take advantage. If I am going to speed $350+ right now on a carb, I would like it to handle all future upgrades as well.
I guess my question is this… would a 650 CFM carb be too much overkill on an otherwise stock engine? Would it be right for my planned modifications? If the 650 CFM will be better long term, and not cause problems when stock, I would like to go with that. On the flip side, would 650 CFM be overkill even with my planned mods? I don’t want to over carb the engine. I see people going up to 750 CFM with 4V heads. The Edelbrock heads are a good mix between the 2V and 4V, with higher compression like the 4V, but valves closer in size to the 2V; that is why I am thinking the 650 CFM should be a good fit. I am not overly concerned with gas mileage, as this is a summer car. I am focusing on smiles per gallon.
