Hey guys, haven't posted about a carb in a while on my 79'.

The 460 runs well enough, and I don't drive her much anymore since I picked up the crew cab 96'.

But I was moving stuff around on the workbench, and came across the old 600 cfm Holley that was on the truck before I upgraded to the 750cfm unit.

THe 750 works well, I never finished trying to sort out my rich condition, (jets I think LX told me to change), but I was thinking of dropping in the 600 to try and save a bit of gas when I do run it.

The 600 is rebuilt, and has new power valve.

Am I being goofy? Would it be prudent to just finish tinkering on the 750 and leave it be?

The 460 to my knowledge is stock, running through a single cat-less 2.5" exhaust.

This is just a fun truck, so nothing is a "have too". Just thinking out loud.

 

Go for it. It may run better than you think.

 

Running the swapped 600 or the tinkering around on the 750 is what you mean?

 

I'd try the 600. It should give better throttle response and mileage.

 

I thought that's what you meant.

I think my original post is confusing. Seems kinda open ended. Then the 600 we shall try.

Thanks LX.

 

Before you install the 600 CFM be sure you install a POWER VAVLE BLOW OUT PROTECTION. I like Centrex myself.

 

I never got the carb on between the crap weather Saturday, and Sunday was spent on the Galaxie.

I have a new power valve from the rebuild kit, I thought all Holley rebuild kits came with blow out protection?

 

The newer ones do, the older ones didn't. It's a little piece that screws into the bottom of the carb in the center of the 4 throttle blades I believe.

 

With the Centrex you can just remove the front center screw from the base and screw in the new Centrex screw. Centrex is the cheapest and easist to install. You can buy the Centrex online I believe it is Centrex.com.

 

Thanks, I'll look into it.

 

http://holley.com/data/TechService/T...wer_valves.pdf

From Holley's tech pages.

After reading that, I have too small a power valve in mine.

I have a 6.5" valve, going by vaccum readings I should have a 9" or so.

Interesting, I'm going to play with it this weekend.

 

That would just make it open later having a 6.5 This will actually make it run a bit leaner until the vacuum drops to 6.5in.

 

Ok. Anyway to date the carb I have? It was on the truck when I bought it, just trying to figure out wether it has blow protection or not.

Article says anything post 92'......

Blair

 

What is the list number on the 600?

 

I'll have to check it when I get home.

Edit: I found it in a thread from 2002. Number on the choke tower: 80457

Thanks
Blair