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Holley 670 TB

steve_kibbe

steve_kibbe

1/2 ton status
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Feb 4, 2004
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Location
Spartanburg, SC
I hope to have it on soon, but I want to make a pass on the 1/8th mile before and after:wink1:

Any body have one...what to expect...other mods necessary?

holley 670.JPG
 
Thats not going to fit on the oil burner you are supposely finishing...:D











Looks real good!
 
I got one. It works.
The injectors are bigger than your factory, so you'll have to re-tune the computer to match.
Possible adjustments on the throttle and tv cables.
To me, the injectors are noisy. I can hear them buzzing. It was pretty annoying when I first started it up, but I've gotten used to it. Especially now that I have a radio.
Good luck!
 
You need to take that cap out as indicted by the arrow.

You now have and adjustable FPR.

And add a stud where the center bolt is so you can mount your air cleaner.

holley 670.JPG
 
bluehen said:
I got one. It works.
The injectors are bigger than your factory, so you'll have to re-tune the computer to match.
Possible adjustments on the throttle and tv cables.
To me, the injectors are noisy. I can hear them buzzing. It was pretty annoying when I first started it up, but I've gotten used to it. Especially now that I have a radio.
Good luck!
Click to expand...
How do I retune the computer? Have a custom chip burnt? Who does it, who would you recomend...:ears:
 
Its not gonna work with your truck. I've got 3 rebuildable qjets that I'll send to you in trade.
 
If I remember correctly the bore on the 670 Holey is larger than the factory bore in the intake manifold (makes sense), which means you need have the ports in the intake manifold bored out. If you don't, the throttle will open only until the plates hit the intake manifold. Holey sells an adaptor plate to go between the TB and intake, but that kind of defeats the purpose of the larger throttle bores.
 
clarkjw24 said:
Its not gonna work with your truck. I've got 3 rebuildable qjets that I'll send to you in trade.
Click to expand...

I wish I had known that when I was at your house saturday :doah: :D
 
loafer said:
If I remember correctly the bore on the 670 Holey is larger than the factory bore in the intake manifold (makes sense), which means you need have the ports in the intake manifold bored out. If you don't, the throttle will open only until the plates hit the intake manifold. Holey sells an adaptor plate to go between the TB and intake, but that kind of defeats the purpose of the larger throttle bores.
Click to expand...

Actually, the throttle body was the restriction on airflow, and not so much the manifold. I would bore out the manifold though, you will prolly pick up a bit more CFM.
 
Congrats on the purchase. I have been looking at TBI's lately and I have a new opinion of them. I thought they were junk for a while but I have come to realize that TBI engines were just weak and not necessarily b/c of the TBI. In fact someone made a post here lately where a carb, TBI, and MPFI all with equal CFM flow were compared and they were basically equal with the MPFI having a slight edge, and the TBI having a slight edge over the carb. http://coloradok5.com/forums/showthread.php?t=180152&highlight=carb%2C+TBI%2C+MPFI

I have a stock TBI off my old 350 and a stock TBI off of a 454. I definitely plan on holding on to them for future builds. I'd love to find another BBC or 406 SBC and put the 454 TBI on it. I think for cost and simplicity TBI is the way to go. Yea MPFI is better but day to day driving I doubt you'd notice the difference and MPFI costs alot more. Again, congrats on the purchase.
 
Without seeing the article, I'd like to know what the results are other than peak power?

"Under the curve" has a lot of meaning, (especially in heavy trucks) and since most dynos start out at 2000RPM, even below that would be useful in knowing.
 
loafer said:
which means you need have the ports in the intake manifold bored out. If you don't, the throttle will open only until the plates hit the intake manifold.
Click to expand...

Thats a good excuse to buy a throttle body spacer big wide open one then it will probably help to have your chip redone
 
Yeah, Brian at tbichips did my computer. Be sure to tell him what mods you've done.
 
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