larrys2006
No. Your gonna have to think a bit on the following.
You do need to consider what gain you'll get. Fords earlier carb options on I6's from 1971 to 1980 show that the Holley 1946 was actually a really restrictive carb, and that the power gains weren't there. Ford did get an Executive Order option for a 2-bbl Holley Weber on the RS 3.3 in 1981. It flows 227 cfm at 1.85"Hg, way better than the 180 cfm at 3"Hg the Holley 1946 is reputed to make
According to Linc 200, the venturi size is 1.125". It's not been stated anywhere, but I think the throttle size could be anwhere from 1.4375" to 1.6875".
Biggest stock Ford 1-bbl was the 240 cube Big Six 1101 Autolite, 210 cfm with a 1.29" venturi and 1.6875" throttle. Then the Carter RBS in the 250, and the bigger one in the 300, about 220 cfm.
So to get that flow, you need to hack into the case with some gusto and do some enlarging.
It is fairly easy to increase the diameter of the venturi by getting a broom handle chucked up to a drill and 3m sandpaper, you can ream the venturi out 62.5 thou easily, 125 thou at a pinch. 200 thou is possible if you use JB weld to rebuild any casting porosity area. Reprofile the venturi, and reinstall the booster venturi
The throttle could be enlarged 62.5 thou, maybee more, but there may be some issues with transfer slots and getting an appropriate replacement throttle.
The gains in cfm would be about 20 cfm with the 125 thou venturi expansion, by my calculations. 30 cfm in total with that and with the throttle enlargement.
Considering a stock 1946 is hard pressed to give 180 cfm at 3"Hg, then there is a significant power boost from these mods, and if the smog guys don't detect any problems, then you've got much better performance without any hassles.
No. Your gonna have to think a bit on the following.
You do need to consider what gain you'll get. Fords earlier carb options on I6's from 1971 to 1980 show that the Holley 1946 was actually a really restrictive carb, and that the power gains weren't there. Ford did get an Executive Order option for a 2-bbl Holley Weber on the RS 3.3 in 1981. It flows 227 cfm at 1.85"Hg, way better than the 180 cfm at 3"Hg the Holley 1946 is reputed to make
According to Linc 200, the venturi size is 1.125". It's not been stated anywhere, but I think the throttle size could be anwhere from 1.4375" to 1.6875".
Biggest stock Ford 1-bbl was the 240 cube Big Six 1101 Autolite, 210 cfm with a 1.29" venturi and 1.6875" throttle. Then the Carter RBS in the 250, and the bigger one in the 300, about 220 cfm.
So to get that flow, you need to hack into the case with some gusto and do some enlarging.
It is fairly easy to increase the diameter of the venturi by getting a broom handle chucked up to a drill and 3m sandpaper, you can ream the venturi out 62.5 thou easily, 125 thou at a pinch. 200 thou is possible if you use JB weld to rebuild any casting porosity area. Reprofile the venturi, and reinstall the booster venturi
The throttle could be enlarged 62.5 thou, maybee more, but there may be some issues with transfer slots and getting an appropriate replacement throttle.
The gains in cfm would be about 20 cfm with the 125 thou venturi expansion, by my calculations. 30 cfm in total with that and with the throttle enlargement.
Considering a stock 1946 is hard pressed to give 180 cfm at 3"Hg, then there is a significant power boost from these mods, and if the smog guys don't detect any problems, then you've got much better performance without any hassles.
