I mentioned the Vacuum Diaphragms used on the 6-Pack (and 435 HP Corvette) engines as having 6 screws to hole the cover on the Housing that bolts to the carb main body.
The 6-Pack Diaphragms are still out there in service but the old 3 BBL carbs 4 screw diaphragms have not been available in many years.
BUT you can mod a 6-pack diaphragm to be used in a 3-barrel by cutting the diaphragm (using a hole punch to match the 3 BBL mounting holes.
That is the easy part.
You also have different length stem peaned on the diaphragm and its washers. But if you remove the old 3-BBL stem, cut the 3 BBL stem down so that you have a new length to pean over the washers, it then will go right into the 6-Pack diaphragm and be close enough it length to work fine.
You put the 6-Pack stem hardware in a carb parts tray.
So to summarize,
1) Trim the ears off the 6-Pack diaphragm but keep the sealing surface so it can be glued to the 3-BBL housing.
2) Remove the original 6 pack diaphragm's stem and put it away in parts.
3) Modify the original stem from the 3 BBL to go on the new trimmed 6 Pack diaphragm.
Assemble the parts in the 4-Bolt 3-BBL housing and you are good to go with your now working again 3 BBL carb.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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