Factory 340 Intake Differences?

[E-B Mel]

I need to find out the differences between three(3) '68-'70(late) 340 factory cast iron intake manifolds #s 2531915-2, 3462848, and 3462848 1. Thanks for the help.

 

[Chryco Psycho]

The last 2 848 & 848-1 are the same , just a reference for how many times the mold was used .
All 3 will be the square bore for the AVS carb . 71 ws the first year for the spread bore intake & Thermoquad carbs .
These were great intakes & even the performance intakes like the LD340 only had a slight edge in performance although being much lighter being alum .

 

[E-B Mel]

The last 2 848 & 848-1 are the same , just a reference for how many times the mold was used .
All 3 will be the square bore for the AVS carb . 71 ws the first year for the spread bore intake & Thermoquad carbs .
These were great intakes & even the performance intakes like the LD340 only had a slight edge in performance although being much lighter being alum .

Good info.

Do you know what year(s) the ....915-2 intake was used? Before, after the ....848? Or, were they used on different models? Or, maybe Plymouth vs. Dodge? I just want to be factory correct in my use of all these manifolds.

Is the after-market Air Gap intake better than the LD340?

 

[Chryco Psycho]

From the part # the 915 intake has to be the earlier one possibly even a 273 intake are the bolt angles through to the cylinder heads the same on both manifolds ? The 273 used a different angle in 64 /65 .
#3462848 is about the correct part # for 70 use but I cant confirm it without a parts manual here .

The Air gap is superior , it will flow a bit more but the big gain is in the air temp getting to the heads

 

[E-B Mel]

Would you happen to know the height difference between the ...848 and the Air Gap?
(Asking for hood clearance reason.)

Will the Carter AVS fit on the Air Gap intake?

 

[Chryco Psycho]

I can find a spec & don't have either here to measure , you could put a straight edge across the carb mount & measure down to a bolt hole & maybe find an Air gap & do the smae measurement but I bet it is 1.5 " taller