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The LD 340 was basically the factory early 340 intake only in aluminum I have one on my fresh rebuilt 340 running factory exhaust manifolds. Ive been told that the new elelbrock air gap is the one you want especially with headers. Not sure about the LD4B. Correct me if Im wrong.

I just had my 340 rebuilt for my 69 swinger, .30 over, forged 10.5/1 slugs eagle rods arp studs finely balanced,X heads with old LD340 comp cam xtreme energy cam kit with 460/470 lift comp cam adjustable rockers with anti pump up lifters running through 727 beefed up with 323 gears I ran the...

I just put on a 4150 600 cfm double pumper with mechanical secondaries on my 69 340 swinger.Quite a difference especially in bottom end as compared to the original avs.