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  1. Rapid340

    360 intake manifolds

    I like the performer RPM. A small single plane like the M1 may be a good choice as well with those gears.
  3. Rapid340

    1.25 or so HP/C.I. from a 390

    In my opinion it would not be very difficult as long as the heads are ported.
  4. Rapid340

    LD4B intake on a 1969 340CID

    I never tested an LD4B but I did test an LD340 on a mildly built 340 in a street/strip duster with a 2600 stall converter. What I found was a very small increase in peak power but a significant loss in low speed torque. Cold idle quality was terrible compared to the stock intake. My quarter mile...
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