So the accelerator pump discharge nozzle screws on a Holley mech Secondary carb are 12-28 thread..... which is great & all except for fact Holley selected a size that apparently Helicoil & all other thread repair insert companies DON'T MAKE A FREAKING REPAIR KIT FOR.....

So do I now have a junk otherwise perfectly fine 750 main body?

My frustration level can't even begin to be described.

Ryan.....just use the 12-24 heli coil thread kit.....its such a small amount and is so close you will be fine....break off the cross bar when you get it screwed in...switch over to a hollow screw to hold the shooter down....and use a small steel ball instead of the rocket now.....Jesse...

Well I'll give it a shot.... have to pick up a 12-24 kit @ machine shop in State College & try it tomorrow. It's not an area I really want to "half A**" something, as if that screw comes out, bye bye motor......

It's just assinine to me someone would mass produce a part that does'nt have a readily available thread repair kit for it.... Why would'nt Holley use a 12-24 screw instead of the oddball 12-28? It's just another example of engineers out-thinking themselves & not using common sense.

But thanks for the reply Jesse, I'll give it a shot as it sounds like you've repaired them like this before.

DON'T JUNK IT! i found a tool supply house in florida that carries the correct heli-coil. i'll get the name when i get home. i ordered a set for my carb, and it worked out slicker than snot!

IIRC (and I'm old enough now that I may NOT ), BLP offers a repair kit for that.

$28 for the BLP kit, he said they sell a ton of them & were almost out. So it's on it's way, I'll post my results on this thread when it gets fixed.

i have the heli-coil kit u need,i had to fix my accelerator pump threads also on my holley 650 db.if u want i can ship it to u tommorrow if u would like. im only shipping from elmira ny shouldnt take that long to get.let me know,thanks mike

here you go. i have one of these. I also have a 12-24 setup that AED put in one of my carbs. the 12/24 does work.

[url=http://www.allfasteners.com/Recoil-Thread-Repair-Kit-34620-12-28-4010pcs41-403462041_p_2308.htm]


do a parts search for 34620

heck by the time you buy some of those kits you just about could buy a proform main body.

I think napa carries that kit.

Ryan, I just installed one of the BLP repair kits in a Ford 3x2 center carb. It's definately a measure twice - cut once deal. After you ream the hole to the right depth, sneaking up on it so you don't ruin the taper at the bottom, make sure you measure the depth and trim the bottom of the insert to length before you Loctite it in. The insert we had was long, and the stackup with the tapered pin and the squirter screw is tight . You'll see what I mean when you get the kit.