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Old 07-30-2008, 07:38 AM   #1
LedHed430
 
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Default Compressor Brace/Performer 350 Intake

So I finally cleaned up and painted the last A/C compressor brace that I need to help straighen-up my crooked R4 compressor. However, there's a little bump in the plans... literally. The Edelbrock Performer 350 intake I'm using has the mounting boss for the brace but there's a small bump right in front of the threaded hole. This bump won't allow the brace to sit flat against the intake.

Is this normal? Anyone else encountered this problem?

Rich
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Old 07-30-2008, 08:47 AM   #2
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if the sbo performer is anything like the bbo performer, you're going to need to modify the a/c mounting bracket ear. you need to cut away some of the hole. i "u" shaped the hole, but others have actually fabbed it up to retain the whole ear, in a modified shape.


bill
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Old 07-30-2008, 08:50 AM   #3
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Or just leave the brace off.
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Old 07-30-2008, 09:04 AM   #4
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Or just leave the brace off.
The compressor is tilted toward the Water pump and it's slowly chewing up the belt. Right now I'm not using the A/C so it's just a free spinning pulley. I want to fix the compressor alignment before I charge the system and add some drag to the pulley. I'll get some pics a little later on today. I'm getting ready to head of to the junk yard for a power window pigtail. I pulled a wire out and my door panel's been on and off so much the current connector is pretty much toast.

Rich
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Old 07-30-2008, 09:45 AM   #5
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Originally Posted by BILL DEMMER View Post
if the sbo performer is anything like the bbo performer, you're going to need to modify the a/c mounting bracket ear.
My Performer 350 did not need any modifications to that area - it fit perfectly.

LedHed430,
I don't remember any bump on my Performer 350. I would say use a file or Dremel and grind the bump flat.
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Old 07-30-2008, 01:32 PM   #6
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Have a bump and the hole is off on the RPM from the factory 307 brackets anyway. I am not running the AC support on 7A heads and have no issues. Belts are all true. Does it still tilt forward with the belt off? If it's way out of whck for some reason, the brace might not help.
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Old 07-30-2008, 04:28 PM   #7
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Dremel tool was my first instinct. I decided it'd probably be best to post a thread before I lopped-off a piece that might be necessary for some strange reason.

The brackets are suspect. The front bracket is tweaked towards the outer end of the adjustment. I've have the compressor adjusted down nearly all the way to accomodate the smallest belt possible. I haven't taken anything loose yet to find out the source(s) of the alignment problem. I swiped a set of brackets and braces off an '81 diesel 350 that are on the list of things-to-do. I'm thinking the front adjustment bolt is not aligned between the two brackets. The kinda thing where the evolution a third hand would help... One to angle the compressor, one to apply tension, and a third to tighten the bolt.

Anyway, so the solution for mounting the brace is to trim the mounting area... I know it may or may not resolve the compressor alignment problem but it will facilitate using the "new" diesel brackets in the future.

Rich




PS. Oh yeah, I know I got an oil leak. New intake/valley pan gaskets are also on the ever growing things-to-do list.
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Old 07-30-2008, 05:45 PM   #8
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OK, now I see what you are talking about - pictures are a wonderful thing. I think my Performer 350 had that bump, and I know the Performer RPM has a similar one, but it definitely did not interfere with the AC bracket. I should mention that I have the early huge cast iron brackets, though. Totally different beast than what you are wrestling with.
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Old 07-30-2008, 05:59 PM   #9
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OK, I lifted some pictures of an early iron intake manifold and a Perforemr 350 from another thread. It appears that the Performer 350 has that "nub" in the middle of the intake runner, right in front of the AC bracket mounting hole. Note that there is one in the middle of each of the corner runners on the Performer 350, and the iron manifold has a similar "nub" but in a slightly different location. Not sure what those are for.

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Old 07-31-2008, 04:08 PM   #10
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Originally Posted by 71CutlassConvertible View Post
OK, I lifted some pictures of an early iron intake manifold and a Perforemr 350 from another thread. It appears that the Performer 350 has that "nub" in the middle of the intake runner, right in front of the AC bracket mounting hole. Note that there is one in the middle of each of the corner runners on the Performer 350, and the iron manifold has a similar "nub" but in a slightly different location. Not sure what those are for.

That's gotta be something used during the assembly process. Kinda like the "transfer lugs" on the old non-389/400 Pontiac blocks. Maybe something that a cradle could grab onto to lift the heavier cast iron intakes into position to be bolted on, for assembly line workers. But that dosn't explain why Edelbrock left them on their casting... Probably more economical to leave them on the aluminum version than creating a new mold without 'em.

Rich
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Old 08-01-2008, 07:52 AM   #11
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"new and improved" now with pix.

i see no reason you couldn't grind that nub off. just grind it even or slightly below the level of the mounting boss.
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Old 08-01-2008, 09:00 AM   #12
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It could be where they poured the molten metal into the castings.
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Old 08-01-2008, 10:17 AM   #13
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^My first thought too.
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Old 08-01-2008, 11:23 AM   #14
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No, they are not machined off as they would be if that was the pour location They are "as cast" on OEM and Aftermarket manifolds. If you look at a new Edelbrock intake, you will see a shiny spot where they were clamped on the outside of the boses. This is almost certainly for the vice/fixture the intake was held in where they machined the intake flanges.
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Old 08-01-2008, 11:37 AM   #15
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No, they are not machined off as they would be if that was the pour location They are "as cast" on OEM and Aftermarket manifolds. If you look at a new Edelbrock intake, you will see a shiny spot where they were clamped on the outside of the boses. This is almost certainly for the vice/fixture the intake was held in where they machined the intake flanges.
So it is ok to grind it down? Because it certainly looks like I will have this same problem.
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Old 08-01-2008, 11:41 AM   #16
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It's nothing but a boss regardless of who is right or what it's for. Whack it off like it was Sarah Jessica Parker's mole.
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