Resurrected Junk
Struck out on finding a plate for changing the secondary metering. Holley no longer stocks them. (Wonder how they support the 4160s being sold by speed shops of all sorts?) I went over to slantsix.org for help, too. On their recommendations, I went with a jet conversion plate. It allows regular jets to be used on a Holley 4160.
Since the conversion plate sticks farther out than the metering plate, the float has to be modified to clear the jets. It also needs to keep the same mass and density so it properly regulates fuel flow into the bowl. The kit I got on Ebay was a NIB AED conversion. It includes everything needed but the jets. The Mopar Six Cylinder book recommends 49s on the primary and 52s on the secondary for a Holley 390 on the Offenhauser 4bbl manifold for street use. This is where I'm starting with the obvious exception of the intake.
The metering plate is held on by six "clutch" screws. These have an hourglass shape cut in the head. There is an Apex driver bit for these. If you're careful, a small flat tip screwdriver can be used. Other than that, no special tools are required for the conversion.
Everyone seems to like pictures, so I'm attaching a photo of the significant parts changed and one of the installed conversion plate. The black color of the float makes it hard to see the difference. Now I need to fabricate a throttle/kickdown cable mount for the combination.
Struck out on finding a plate for changing the secondary metering. Holley no longer stocks them. (Wonder how they support the 4160s being sold by speed shops of all sorts?) I went over to slantsix.org for help, too. On their recommendations, I went with a jet conversion plate. It allows regular jets to be used on a Holley 4160.
Since the conversion plate sticks farther out than the metering plate, the float has to be modified to clear the jets. It also needs to keep the same mass and density so it properly regulates fuel flow into the bowl. The kit I got on Ebay was a NIB AED conversion. It includes everything needed but the jets. The Mopar Six Cylinder book recommends 49s on the primary and 52s on the secondary for a Holley 390 on the Offenhauser 4bbl manifold for street use. This is where I'm starting with the obvious exception of the intake.
The metering plate is held on by six "clutch" screws. These have an hourglass shape cut in the head. There is an Apex driver bit for these. If you're careful, a small flat tip screwdriver can be used. Other than that, no special tools are required for the conversion.
Everyone seems to like pictures, so I'm attaching a photo of the significant parts changed and one of the installed conversion plate. The black color of the float makes it hard to see the difference. Now I need to fabricate a throttle/kickdown cable mount for the combination.