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The basic difference in the LD4B and LD40 is that the runners are reversed and the runners taper down at the head ports.
For the reason above.......is why I never even mentioned the LD340. The LD4B, LD340 and Weiand 8007 are all so close it's neglible for a street car. It's the Performer that is sooooooo dramatically different once you study them.
But, I could see a 318 with a mild cam, 500 cfm Edelbrock/Carter and headers getting 22+ mpg if properly built tuned, built and driven.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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