I have just returned from two hours on the Dyno:
My results are a little disappointing. I am running a 428 CJ bored .060 over with TRW 10.1 forged alum pistons, Lunati 512/292 hyd cam, Edelbrock Alum Medium Riser heads, Edelbrock Performer RPM intake, MSD FE Distributor, MSD 6AL ignition box and coil, 8mm Ford Motorsport plug wires. Champion 71 plugs , Holley 750 carb (I also tested the Edelbrock 750 and lost 28 hp)w/ Holley red elect fuel pump and regulator set at 6 pounds.
My first pull on the dyno was a solid 362 hp and 391 ft pounds of torque at 5800 RPM at the wheels. Torque was flat from 2000-5200 RPM and then fell off to 387 at 5800.
We changed the timing to 10 deg initial and all in by 34 deg 3300 rpm. We put in the two smallest blue springs on the dist and lost about 9 hp on the second pull. Next we switched to the two med silver springs and still lost 13 hp on the third pull. Put the med silver spring and blue spring back in the dist and made a forth pull and my hp came back to 363 hp at 5800 rpm.
Carb: Was perfect on the primary's but the secondaries were loading up and was not able to open the secondaries up completely. Went to the smallest spring avail for a Holley vaccuum secondaries carb and down sized my secondary jets to 74. Made several other pulls on the dyno and the best I could do was 371 hp and 393 ft pounds of torque. Chad told me that it is normal to loose up to 150 hp from the fly wheel to the rear wheels.
His suggestions were to go with a mechanical Holley or Demon carb (up to 850), Autolite plugs and change my air filter to a KN and don't
oil it. I tried one of his KN air filters but my hood wouldn't close and I only gained about 4 hp on my last pull. I am going to think about another carb for awhile.
Any way those are my results which were better than the SS 396 before me (his best pull was only 323 HP and 335 pounds of torque. Still think there is another few horses for me to gather up some day.
428 CJ Dyno Results....Inquiring Minds...
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