Slalom4me

Holley lists different throttle bodies for the early LT1 (92-93)
and subsequent years (94-96). They also differentiate between
the models by stating the early version includes Corvette (along
w/ F-bodies) but omit Corvette for the late version.

Can anyone tell me about the difference between these versions.
Pictures would get you bonus points.

** --- Corvette & F-Body Versions (92-93) --- **
112-504 Holley Twin 52mm throttle body
112-505 Holley Twin 58mm throttle body

** --- F-Body Versions (94-97) --- **
112-508 Holley Twin 52mm throttle body
112-509 Holley Twin 58mm throttle body

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KENS80V

Sent you an email. The main difference is in the linkage style. Match the throttle body to the year ECM you have. I have a picture of all the different styles I can send you.

Ken

KENS80V

If your having trouble with your original one or you want to enlarge it to 52mm. ......I would just send it to David Koldos for a rebuild/enlargement. Do a search on here with his name...he comes highly regarded. He installs roller bearings as well (instead of bushing) for longevity. He did my 89/91 style throttle body.

Slalom4me

Thanks for the email, reply sent.

Is the linkage difference due to the change from the 4L60
(w/ TV cable) to the 4L60-E (w/o TV cable) transmission?

Am I right in assuming that the matter of the TPS voltage
differences could be addressed by switching TPS sensors,
or are the castings different - making TPS units
non-interchangeable.

The reason for the question is to determine which LT1 TB's
are appropriate for a Holley Stealth Ram on a pre-LT1
C4. Unless David K. offers LT1 TB's without requiring a core,
people going this route need to pick up used ones or go to the
aftermarket choices.

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KENS80V

Why do you have to use a LT1 throttle body on the HSR. If this setup is going on your 89 Corvette why can't you use this 89/91 style TB. Hope you're using a high rise hood cause it won't fit under the stock one.

KENS80V

Go to www.stealthram.com (they say you do not have to use the LT1 throttlebody). Check out the message board as others comment on using the early style throttle body without any difficulties. The only interference seems to be at the fuel rail corner/TB linkage. This can easily be resolved according to the guys post. Also in the FAQ section it states you can use the early style. Hope this helps!

Ken

FD2BLK

Yes that is exactly why


What exactly is your problem? If it is that the min VDC for the idle position is not high enough this can e fixed one of two ways 1. purchase an adjustable TPS sensor with the oblonged holes or 2. oblong the holes in the sensor you have now. This is a common problem with after market TB's and I had to do this mod to get my TPS to .43 VDC when I installed my Holley 58mm. Have you checked to see if you are getting 100% throttle yet with the pedal to the floor? I purchased a 92/93 TB by acident and had to mod the linkage to get full pull.

Slalom4me

I had responded in the post to an item that came up in a PM, so my
remark may look out of context here.

I was looking for clairification about dependencies between the TPS
and the different ECMs I'd heard about. Your remarks and tips
answer the issue for me - if there are any, they can be overcome.

Thanks,
Ken R.

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mannywish

Does anyone have any advice on connecting the throttle body cable to the holly. The linkage to the cable does not fit the throttle body. The linkage is to small and it just falls off.