Stock Carb Substitutes

mike coates · 11-17-2010, 10:02 PM

I am looking for input on legal carbs for stock.

The engine specs list the carb numbers and sizes for each engine. If you run a specific combo, can you use the same type carb from another engine, as long as the size matches?

For example, I run a 70 340 with the AVS. There are a number of AVS carbs for the 383 or earlier 340s that have different carb numbers, but have the same measurements. Is it legal to run one of these in place of the correct 70 carb?

Also, anyone in IHRA, I run mine in Pure Stock, do you know if it would be legal to due this, if it is legal in regular stock.

Thanks for the input.
Mike Coates

Jeff Lee · 11-17-2010, 11:55 PM

Yes for NHRA. The numbers are meaningless but the specs are.

Todd Boyer · 11-19-2010, 10:26 PM

I have been told the same specifically for a 340 AVS. I think the blueprint sheet shows only a couple of different carb numbers, but Jeff is right that NHRA only really cares about specs.

GTX JOHN · 11-20-2010, 04:48 AM

Don't the different Mopar AVS have flow correction tabs ( I forgot the tech name) placed on boosters in different places to compensate for flow difference in manifolds on 340 and 383? I always run 340 carbs on 340 and 383 carbs on 383. Does anyone else think it make a difference?

11-17-2010, 10:02 PM	#1
mike coates Junior Member Join Date: Jul 2007 Location: Marshall, MI Posts: 33 Likes: 0 Liked 0 Times in 0 Posts	Stock Carb Substitutes I am looking for input on legal carbs for stock. The engine specs list the carb numbers and sizes for each engine. If you run a specific combo, can you use the same type carb from another engine, as long as the size matches? For example, I run a 70 340 with the AVS. There are a number of AVS carbs for the 383 or earlier 340s that have different carb numbers, but have the same measurements. Is it legal to run one of these in place of the correct 70 carb? Also, anyone in IHRA, I run mine in Pure Stock, do you know if it would be legal to due this, if it is legal in regular stock. Thanks for the input. Mike Coates __________________ Mike Coates TBD

11-17-2010, 11:55 PM	#2
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Stock Carb Substitutes Yes for NHRA. The numbers are meaningless but the specs are. __________________ Jeff Lee 7494 D/S '70 AMX

11-19-2010, 10:26 PM	#3
Todd Boyer Senior Member Join Date: Feb 2004 Location: Saint John NB Canada Posts: 560 Likes: 27 Liked 6 Times in 5 Posts	Re: Stock Carb Substitutes I have been told the same specifically for a 340 AVS. I think the blueprint sheet shows only a couple of different carb numbers, but Jeff is right that NHRA only really cares about specs.

11-20-2010, 04:48 AM	#4
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,725 Likes: 2,775 Liked 2,446 Times in 691 Posts	Re: Stock Carb Substitutes Don't the different Mopar AVS have flow correction tabs ( I forgot the tech name) placed on boosters in different places to compensate for flow difference in manifolds on 340 and 383? I always run 340 carbs on 340 and 383 carbs on 383. Does anyone else think it make a difference?