422 dyno fail

harrisonm said

Something is fishy. About 15 years ago, Mopar Muscle took a bone stock 340 and added a Comp 268 Xtreme energy cam/springs and lifter kit, 850 CFM carb, Edelbrock Air Gap, 1 5/8" headers and it made 392 HP (a little over 1.1 HP per CI). I followed that same recipe on my motor. There was no fancy head work, no manifold port matching, etc. With the specs listed, the Op's motor (at 422 CID) should have made around 460 HP. A bigger carb should have put it up to over 475. With that combo I see no reason why one HP per CI was not achieved. Like I said, something is fishy.

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And that MM deal is total BS... They can print it, doesn't make it so. That is the one dyno test I'll call BS on every time.

That's a 1hp/CI build roughly. It might make a true 350-355 hp. Been around too many of them and that thing never saw a strip to prove it out. Like many of the dyno engines from MM. MPH always a disappointment.

Definitely something wrong with the numbers from the OP's mill. They changed the distributor and a spacer and it picked up bunch... HMMM One thing I'd guess at is not at WOT, but, that is one of the things you definitely verify prior to making pulls.

I had a 360 with ede's 270 @.500 and a smaller HR cam, victor, 950hp, hooker 1.75 headers and it made 130 more HP than the OP's all the way to 6300.