Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

jmanhoff said

Supposedly the set screws will arrive Tuesday. I also get paid tomorrow so I’ll order the numbered drill bit set once the check clears. My pin gauge comes tomorrow as well so once everything comes in I’ll measure all the holes and add them to a spreadsheet.

On some other forums it seems like a lot of people use 6-32 set screws for PVCRs, does that sound accurate? If so that makes my life easier because I could just use the 50 pack I already bought for those as well in the future.

Then that leaves the T-slot restrictors which goes into the main body right? And to start I should do .078”? I think that’s what was said. I think those are also 10-32 or 10-24 I wouldn’t think the thread pitch matters, only the size but I think my tap kit has both anyway.

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You can use 6-32 screws for the power valve channel restrictors but I use 8-32 because you never know how much power these carbs may need to make. If you use 6-32 set screws, you are limited on how big you can make the hole in the brass because eventually you drill out the hex and then you can’t install or remove them if you drill them in place.

I use 10-32 for the T slot restricters. You can use 8-32 screws here too but I’m pretty sure that the biggest you can make the hole in an 8-32 screw is about .078ish before you get into the hex.

As long as you think you’ll never need to drill a hole bigger than what the hex will allow you’ll be ok.

It’s easier just to use the biggest set screw that will fit. I use:

6-32 for idle feed restricters and emulsion.

8-32 for PVCR.

10-32 for T slots and air bleeds.