Throttle body

Bryan Worner · 08-07-2015, 11:20 AM

If you were building a 1990-1992 Chevy 350 (245/275) for Stock or Super Stock, utilizing the NHRA Engine Blueprint Specification Guideline and Stock Car Classification guidelines, what throttle body would you "legally" use?

magnumv8 · 08-07-2015, 07:13 PM

In the blueprint specs all the way to the right of the engine choice depending on year you will see either a number 1 or 2....go to the bottom and it says that the 2 x 1.889" (48 mm ) throttle body is the legal one..........D L Rambo...STK 1300

Jeff Teuton · 08-07-2015, 08:58 PM

I was told quite recently that OEM throttle bodies only in stock and super stock. I was asking if specs say 80 mm, can I use any. Answer was no. Just sayin.

Paul Hellenberg · 08-07-2015, 09:55 PM

Quote:

Originally Posted by Bryan Worner

If you were building a 1990-1992 Chevy 350 (245/275) for Stock or Super Stock, utilizing the NHRA Engine Blueprint Specification Guideline and Stock Car Classification guidelines, what throttle body would you "legally" use?

As far as I know all the GM 2 port throttle bodies are more of less the same spec. The publish size is in the blue print specs. Some of the TB have slightly different throttle attachments.

Dwight Southerland · 08-08-2015, 10:35 AM

There are generally only two TBI sizes. One is a 1 11/16" bore that is used on 4.2, 5.0 and 5.7 engines and the other is a 2" bore used on 454 engines.

Sorry! I pulled the trigger to quickly. I thought you were talking about TBI engines.

Herbie Null · 08-09-2015, 08:23 AM

The spec sheet does not list a part number, all it has is N/A. In the notes it says 2 @ 1.889 48MM, so I guess you can build your own throttle body just make sure its 48MM

08-07-2015, 11:20 AM	#1
Bryan Worner Senior Member Join Date: Oct 2002 Location: Duncannon, PA Posts: 817 Likes: 130 Liked 477 Times in 79 Posts	Throttle body If you were building a 1990-1992 Chevy 350 (245/275) for Stock or Super Stock, utilizing the NHRA Engine Blueprint Specification Guideline and Stock Car Classification guidelines, what throttle body would you "legally" use?

08-07-2015, 07:13 PM	#2
magnumv8 Member Join Date: Feb 2009 Location: Coraopolis, Pa. Posts: 172 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle body In the blueprint specs all the way to the right of the engine choice depending on year you will see either a number 1 or 2....go to the bottom and it says that the 2 x 1.889" (48 mm ) throttle body is the legal one..........D L Rambo...STK 1300

08-07-2015, 08:58 PM	#3
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 325 Times in 50 Posts	Re: Throttle body I was told quite recently that OEM throttle bodies only in stock and super stock. I was asking if specs say 80 mm, can I use any. Answer was no. Just sayin. __________________ Jeff Teuton 4022 STK

08-08-2015, 10:35 AM	#5
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,996 Likes: 63 Liked 756 Times in 189 Posts	Re: Throttle body There are generally only two TBI sizes. One is a 1 11/16" bore that is used on 4.2, 5.0 and 5.7 engines and the other is a 2" bore used on 454 engines. Sorry! I pulled the trigger to quickly. I thought you were talking about TBI engines. __________________ Last edited by Dwight Southerland; 08-08-2015 at 12:14 PM. Reason: Mistake

08-09-2015, 08:23 AM	#6
Herbie Null Member Join Date: Aug 2008 Location: greencastle pa Posts: 215 Likes: 86 Liked 439 Times in 69 Posts	Re: Throttle body The spec sheet does not list a part number, all it has is N/A. In the notes it says 2 @ 1.889 48MM, so I guess you can build your own throttle body just make sure its 48MM __________________ Herbie Null 201 SS