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 Post subject: 1250 carb issue
 Post Posted: Thu Jul 22, 2010 5:15 am 
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All done with the 1250 but I can see quiet a ridge around the manifold when looking down inside the carb. Can I just take a some material out and blend
that into the plenum?? Also I have a spacer with the same problem.. #-o
I'll post some pictures later so you can see what I'm talking about.. =;

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 Post subject: Re: 1250 carb issue
 Post Posted: Thu Jul 22, 2010 8:53 am 
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YES, you will have to make that manifold clear the throttle bores of that carb and it wouldn't hurt to make it a little larger to help keep fuel suspended in that area. I had to do this on my Brodix SBC intake with my 1150 though there was only about a 1/16" that I had to remove.

A little big is good, a little small is not.

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 Post subject: Re: 1250 carb issue
 Post Posted: Thu Jul 22, 2010 3:23 pm 
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Yep, you went from a 2" to a 2 1/8" butterfly. We did try my 1250 on top of a 2" throttle stop on the 447 now in my brothers Vette, still picked up .05 in the 1/8 over a 1050...


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 Post subject: Re: 1250 carb issue
 Post Posted: Fri Jul 23, 2010 7:52 am 
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thanks Mark,Ken,,,,,,,It looks like it needs adjustment on the outer edges where the fin is in the manifold. I will just blend it and get rid of that flat edge..

I also have a couple of spacers and a reversion plate that I got from the "Crazy" guy on here but they have the same issues..I guess I should do the same with them also....The open spacer I can get Tony to open that up for me as he has a bridge port but the 4 hole one really needs bigger holes and don't have a 2 1/8 drill bit O:) ...Any suggestions? #-o

Oh and the 4 hole and open spacers are wood and the reversion plate is aluminum. =;

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 Post subject: Re: 1250 carb issue
 Post Posted: Fri Jul 23, 2010 9:04 am 
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Those large holes need to be bored out and if Tony has a boring head for his mill, he can do those too. You have a PM.

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 Post subject: Re: 1250 carb issue
 Post Posted: Fri Jul 23, 2010 10:43 am 
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He can open them up with a small cheap flycutter also.

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 Post subject: Re: 1250 carb issue
 Post Posted: Fri Jul 23, 2010 12:24 pm 
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Just talked to him and he has a fly cutter..We will try it maybe over the weekend.. =;

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 Post subject: Re: 1250 carb issue
 Post Posted: Fri Jul 23, 2010 2:48 pm 
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Beretta wrote:
Just talked to him and he has a fly cutter..We will try it maybe over the weekend.. =;


Sweep the hole with an indicator mounted in the machine spindle before you bore it. That way you keep the hole in the correct location. Another thing, DO NOT deburr the bottom of those holes! You can take a flat file and draw file the bottom to knock the burr off but DO NOT make any radius or bevel at the exit of those holes! Top side doesn't matter.

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