Canadian1968
Well-Known Member
I purchased a the proform 67101c main body to install on my holley 3310 750 Vac secondary carburetor. This main body gives you down leg booster , adjustable air bleeds, and no choke horn. It is basically a holley HP series main body at fraction of the cost. Best of all I keep the efficiency and driving manners of the vacuum activated secondaries.
When I opened the box I was surprised to see all brand new non stick re usable gaskets. A new metering plate , new fuel bowl screw gaskets and a pair of 72 and 84 fuel jets . The body itself us also aluminum and considerably lighter than the original main body
In my case I have already modified my carb by removing the rear metering plate and installing a meter block so that I can easy change the jetting . The proform comes with gaskets for front and rear meter blocks and fuel bowls which is a total bonus!
I got started on disassembling my carb, pretty straight forward process . With the bowls and blocks removed you can see some slight differences in the two main bodies. Mainly the well where the power valve sits. The holley main body has a considerably larger area, as well the hole in center is actually a threaded mounting hole for one of the 6 screws thar hold the throttle plate to the main body. On the proform this hole is completely blocked off from PV well. I see this having 0 affect on anything performance wise.
From the top the difference is obvious. Most notable is the different boosters and adjustable air bleeds .
The proform main body comes with 31 pump nozzle. I had installed a 35 in my original body. I swapped this over. In the process found another surprise. The proform comes with the hollowed out screw that holds the pump nozzle in place. This allows for maximum fuel flow for an unrestricted pump shot !
I am going to install the same jetting I was running before ( 72 front , 72 rear) . Will see how this performs .
Over all very happy with this product. The added surprises in the kit really make this a great " bang for buck " purchase as far as I am concerned.
Unfortunately I'm in Ontario Canada, aside from a start up and idel setup in won't be able to do much else until spring time!
When I opened the box I was surprised to see all brand new non stick re usable gaskets. A new metering plate , new fuel bowl screw gaskets and a pair of 72 and 84 fuel jets . The body itself us also aluminum and considerably lighter than the original main body
In my case I have already modified my carb by removing the rear metering plate and installing a meter block so that I can easy change the jetting . The proform comes with gaskets for front and rear meter blocks and fuel bowls which is a total bonus!
I got started on disassembling my carb, pretty straight forward process . With the bowls and blocks removed you can see some slight differences in the two main bodies. Mainly the well where the power valve sits. The holley main body has a considerably larger area, as well the hole in center is actually a threaded mounting hole for one of the 6 screws thar hold the throttle plate to the main body. On the proform this hole is completely blocked off from PV well. I see this having 0 affect on anything performance wise.
From the top the difference is obvious. Most notable is the different boosters and adjustable air bleeds .
The proform main body comes with 31 pump nozzle. I had installed a 35 in my original body. I swapped this over. In the process found another surprise. The proform comes with the hollowed out screw that holds the pump nozzle in place. This allows for maximum fuel flow for an unrestricted pump shot !
I am going to install the same jetting I was running before ( 72 front , 72 rear) . Will see how this performs .
Over all very happy with this product. The added surprises in the kit really make this a great " bang for buck " purchase as far as I am concerned.
Unfortunately I'm in Ontario Canada, aside from a start up and idel setup in won't be able to do much else until spring time!
