The conversion was not as easy as I originally believed. The following items will assist those who follow with some explicit details.
The old rigid fuel line must be removed from the Quadrajet and the Carter fuel pump as it is now too short. This fuel line uses 5/8 inch x 20 compression fittings. The sight tube will also have to be removed and replaced with a longer section of hose. This is because both the fuel inlet and the sight gage inlet port are in different positions between the Quadrajet and the Edelbrock.
The Edelbrock 1409 fuel inlet also uses a 5/8 x 20 thread. If you are going to replace the rigid fuel line with A1 hose, you will need to obtain new fittings. These are not available at most boating or hardware stores. They are available from Autozone and the like. For the fuel pump, you can use their 5/8 by 20 brass fitting with a bulb on the end. However, for the Edelbrock fitting, you will need to use their four inch 5/8 x 20 flared fitting. This is the assembly that has the 5/8 x 20 fitting around the pipe. It is necessary to use this type of assembly because of the depth of the inlet port.
The Edlebrock also does not have a small internal filter like the Quadrajet. This means that you will need to fit a 3/8 inch in line filter between the Edelbrock and the fuel pump. I positioned mine near the carb so that it was easier to get to. I also obtained this from Autozone.
In order to fit the Edelbrock to the engine, you must use the adapter plate. In addition, there should already be fitted a "wedge" that changes the fore aft angle of the carb. The extra thickness of the wedge prevents the bolts supplied with the adapter plate from reaching the threads on the engine. These four screws are different than normal screws in that their heads are of a smaller than normal diameter. In order to mount the adapter plate to the engine, you will need to purchase 2 one inch long allen head socket bolts that are 5/16 inch coarse thread for the front two mounting holes and 2 one and a half inch long allen head socket bolts also of 5/16 inch coarse thread for the two aft most mounting holes.
In addition, you will also need to drill a 5/16 inch hole in the throttle cable mount as you will no longer be using the original studs, but the new studs on the Edelbrock to fix the carb to the adapter plate. I drilled the new hole on the inboard side of the mount so that the angle of the throttle cable was as straight as possible.
Luckily, I did not have to grind out the inside diameter of the spark arrestor to fit on the new carb. I had been led to believe this by many others who may not have been as fortunate.
In summary, in order to do this installation, you will need.
1 each 1409 Edelbrock carb, Summit Racing
1 each adapter plate, Summit Racing
5 feet of A1 3/8 inch fuel hose
5 feet of 1/4 inch braided vinyl hose
1 each 5/8 x 20 threaded 3/8 inch barbed or bulbed brass fitting, Autozone
1 each 5/8 x 20 threaded 3/8 inch flanged fitting, Autozone
2 each 5/16 coarse thread 1 inch long allen head socket bolts
2 each 5/16 coarse thread 1.5 inch long allen head socket bolts
1 each 3/8 inch barbed in line fuel filter, Autozone
At least 4 hose clamps
Teflon tape or the like.
The old rigid fuel line must be removed from the Quadrajet and the Carter fuel pump as it is now too short. This fuel line uses 5/8 inch x 20 compression fittings. The sight tube will also have to be removed and replaced with a longer section of hose. This is because both the fuel inlet and the sight gage inlet port are in different positions between the Quadrajet and the Edelbrock.
The Edelbrock 1409 fuel inlet also uses a 5/8 x 20 thread. If you are going to replace the rigid fuel line with A1 hose, you will need to obtain new fittings. These are not available at most boating or hardware stores. They are available from Autozone and the like. For the fuel pump, you can use their 5/8 by 20 brass fitting with a bulb on the end. However, for the Edelbrock fitting, you will need to use their four inch 5/8 x 20 flared fitting. This is the assembly that has the 5/8 x 20 fitting around the pipe. It is necessary to use this type of assembly because of the depth of the inlet port.
The Edlebrock also does not have a small internal filter like the Quadrajet. This means that you will need to fit a 3/8 inch in line filter between the Edelbrock and the fuel pump. I positioned mine near the carb so that it was easier to get to. I also obtained this from Autozone.
In order to fit the Edelbrock to the engine, you must use the adapter plate. In addition, there should already be fitted a "wedge" that changes the fore aft angle of the carb. The extra thickness of the wedge prevents the bolts supplied with the adapter plate from reaching the threads on the engine. These four screws are different than normal screws in that their heads are of a smaller than normal diameter. In order to mount the adapter plate to the engine, you will need to purchase 2 one inch long allen head socket bolts that are 5/16 inch coarse thread for the front two mounting holes and 2 one and a half inch long allen head socket bolts also of 5/16 inch coarse thread for the two aft most mounting holes.
In addition, you will also need to drill a 5/16 inch hole in the throttle cable mount as you will no longer be using the original studs, but the new studs on the Edelbrock to fix the carb to the adapter plate. I drilled the new hole on the inboard side of the mount so that the angle of the throttle cable was as straight as possible.
Luckily, I did not have to grind out the inside diameter of the spark arrestor to fit on the new carb. I had been led to believe this by many others who may not have been as fortunate.
In summary, in order to do this installation, you will need.
1 each 1409 Edelbrock carb, Summit Racing
1 each adapter plate, Summit Racing
5 feet of A1 3/8 inch fuel hose
5 feet of 1/4 inch braided vinyl hose
1 each 5/8 x 20 threaded 3/8 inch barbed or bulbed brass fitting, Autozone
1 each 5/8 x 20 threaded 3/8 inch flanged fitting, Autozone
2 each 5/16 coarse thread 1 inch long allen head socket bolts
2 each 5/16 coarse thread 1.5 inch long allen head socket bolts
1 each 3/8 inch barbed in line fuel filter, Autozone
At least 4 hose clamps
Teflon tape or the like.
