SS/HA 71' Duster am I figuring right ?

RJ · 11-24-2008, 12:57 PM

The intake port volume for the 2.020" valved 68-71 340 needs to be corrected. The same ~port volume is listed in the NHRA port volume specs for the 2.020" valved 68-71 340 as the 1.880" valved 72-73 340's and 74-up 360's?, it's not right and never has been. The port throat is bigger on the 68-71 high compression 340's, yet they need to adhere to the smaller 72-73 340 and 74-up 360 port volume? It's worth trying if NHRA corrects the 68-71 340 intake port volume. Probably why there are several competitive high compression 340's in stock where no volumes are checked, but super stock is lacking.

11-24-2008, 12:57 PM	#3
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Re: SS/HA 71' Duster am I figuring right ? The intake port volume for the 2.020" valved 68-71 340 needs to be corrected. The same ~port volume is listed in the NHRA port volume specs for the 2.020" valved 68-71 340 as the 1.880" valved 72-73 340's and 74-up 360's?, it's not right and never has been. The port throat is bigger on the 68-71 high compression 340's, yet they need to adhere to the smaller 72-73 340 and 74-up 360 port volume? It's worth trying if NHRA corrects the 68-71 340 intake port volume. Probably why there are several competitive high compression 340's in stock where no volumes are checked, but super stock is lacking.

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