Fast340cuda said

I recently took my car to a local chassis dyno and ran it with the LD340 intake. Combo is 4.06” bore, 3.58” stroke, 11.1-1 compression ratio, solid flat tappet cam (252/257 @ .050, .550 ish lift, 108 LSA). Intake was gasket matched and the plenum divider was cut down 1” and 2.5” length wise. This was topped off with a 750 double pumper. Here is the dyno graph for reference.

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Fast340cuda said

Edelbrock RPM’s that were touched up by Ray Barton.

I use the numbers as a reference. Was more interested in the power curve. I have tried the performer RPM, Weiand action plus, Victor 340 as well as the M1 single plane. I have been the happiest with the LD340 so far on my combo.

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Fast340cuda said

The heads have only had a valve job and the bowls cleaned up. I believe the camshaft is a little small, it was ground for a 3.31” stroke but I ended up finding a great deal on a 3.58” stroke crank and some .060” 360 pistons so it is now 371 CID.

I feel the car runs pretty good, pump gas, all steel, full interior and runs mid 11’s with a 4 speed at 118 MPH. I also feel the dyno numbers are pretty good for a motor that was designed in the 1960’s as there were several late model 392 challengers and 5.0 mustangs that were putting out low 400’s on the dyno which seems to line up with what others are reporting.

I have only had the LD340 on the dyno. I have run both the Victor 340 and M1 on the track with the M1 being a little over a tenth faster. On the street, the performer RPM was great off of idle but the LD340 pulls harder up top and the power doesn’t nose over like it did with the RPM.

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