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Re: Which intake is better flowing?
[Re: 71yelladustr]
#1274462
07/28/12 07:51 PM
07/28/12 07:51 PM
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Joined: Jan 2003
Posts: 5,898
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,898
Florida
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Quote:
FWIW, I had both intake manifolds on my 73 340 Dart sport and the LD340 ran the best. This was on a 10 to 1 engine with a .484 purple shaft otherwise bone stock. It picked up .25 sec in the 1/4 and a couple MPH. The M-1 is basically a aluminum version of an early 340 manifold. Now the M-1 single plane is a different story, When I bumped the compression and added more cam along with some head work it trumped the ole LD340 
 with what he said.
The M-1 dual plane would work best on a mild, street only small block. I compared a Weiand Stealth, which appears very similar to an LD-340, to a Holley Strip Dominator (very similar to the single plane M-1) on my race-only combo and the Weiand dual plane was only about a tenth slower than the single plane Holley. But I have a lot of gear, converter and cam duration, which stays over 5,000 rpm once the converter flashes, and the single plane liked it better. I figure for anything less, the LD-340 should be better overall. Of course, carb tuning will be different and will be a factor in the final results.
See if the LD-340 will like 2 jet #'s leaner on the shallow plenum side or 2 #'s richer on the deeper plenum side. Jet for MPH and squirters and pump cams for 60'-330' times.
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