Built AMC 401 Value??

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   yeah, there is ~15% HP loss at 5k feet.  3% per 1000 ft above sea level is a good estimate.  And turbo engines are not immune to this either.  And don't argue, look it up; the available octane drops at higher  elevations so unless you truck in a tanker of 93 octane and have a custom tuned ECU you are going to lose power.  Been there and done that with a turbo engine at 10k feet; it ain't the same as sea level :).
But I'd rather buy a standard bore core engine that's apart for inspection than something that's running that I don't know if it's .060" over with other possible internal issues.  So I think $5k is optimistic.

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Steve_P Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3806	Post Options Post Reply Quote Steve_P Report Post Thanks(0) Quote Reply Posted: Nov/22/2020 at 6:48pm
	yeah, there is ~15% HP loss at 5k feet. 3% per 1000 ft above sea level is a good estimate. And turbo engines are not immune to this either. And don't argue, look it up; the available octane drops at higher elevations so unless you truck in a tanker of 93 octane and have a custom tuned ECU you are going to lose power. Been there and done that with a turbo engine at 10k feet; it ain't the same as sea level :). But I'd rather buy a standard bore core engine that's apart for inspection than something that's running that I don't know if it's .060" over with other possible internal issues. So I think $5k is optimistic.

RandyB Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Nut Joined: Aug/04/2020 Location: Florida Status: Offline Points: 462	Post Options Post Reply Quote RandyB Report Post Thanks(0) Quote Reply Posted: Nov/22/2020 at 10:37pm
	Do you have a build sheet from an engine builder and ported heads could mean anything. Not trying to detract from your engine, but details are very important and when was the engine built. I am not up on AMC engine prices, but if I needed an engine I would want to know specifics.
	Randy B 68 Javelin SST 343 73 Charger Rallye 340 triple Blk

i6cj7 Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Apprentice Joined: Feb/20/2018 Location: virginia Status: Offline Points: 138	Post Options Post Reply Quote i6cj7 Report Post Thanks(0) Quote Reply Posted: Nov/23/2020 at 4:44pm
	Yeah the new 4 door wrangler with the 392 hemi does the 1/4 mile in 13 seconds. 0 to 60 in 4.5 So again, that 401 that does 12s is not a "Race motor" as mentioned. Because that new Hemi isn't a race motor either. Considering that 4 door wrangler weighs 4500lbs vs CJs 3300lbs It's a jeep, they weigh nothing and with big tires can put that power to the ground.

Boris Badanov Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209	Post Options Post Reply Quote Boris Badanov Report Post Thanks(0) Quote Reply Posted: Nov/26/2020 at 7:27am
	I assure you that the hemi wrangler is not being run at 5,000 feet... Jeep is claiming 470 net HP as installed? I bet it is one fun ride. I err'd earlier in stating that the pressure ratio suffers at that altitude. It remains the same no matter the altitude. Air density is lower as a result cylinder pressure does suffer.
	Gremlin Dreams