amc 401

kabbass0621 · 08-26-2007, 05:28 PM

first is an amc 401 a big or a small block, and what is the stock horsepower and torque? My buddys dad just bought a jeep with an amc 401 uin it and it turns about 500 horses, what do u think he did to it to make it that high?
THANX

mrjohnwayne · 08-28-2007, 07:23 AM

Sorry man but I couldnt tell ya on that one.

75K30 · 08-28-2007, 08:14 AM

Neither.
The AMC engine was never a small block, nor a big block. Like Pontiac, it was all one block. The 290 parts will fit the 401 as will 360 and 390 parts.
Now, 500 hp???? This is more than likely wishfull thinking. Perhaps an early 10.25 engine made 300 hp and could make a little more, but to expect 1.24 hp per cubic inch from a 400 inch motor with cast iron heads is, well a stretch. Not saying it can't be done, but a ton of money has to be spent to obtain those figures.
This injected 401 with aluminum heads, roller cam, yada, yada barely makes 488 net Hp @ 5700 rpm. I say barely, that is a bunch of power. 500 is a big number.

08-26-2007, 05:28 PM	#1 (permalink)
kabbass0621 Full Member Join Date: Aug 2007 Posts: 10	amc 401 first is an amc 401 a big or a small block, and what is the stock horsepower and torque? My buddys dad just bought a jeep with an amc 401 uin it and it turns about 500 horses, what do u think he did to it to make it that high? THANX

08-28-2007, 07:23 AM	#2 (permalink)
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,003	Sorry man but I couldnt tell ya on that one. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

08-28-2007, 08:14 AM	#3 (permalink)
75K30 Senior Member Join Date: Jul 2006 Posts: 2,389	Neither. The AMC engine was never a small block, nor a big block. Like Pontiac, it was all one block. The 290 parts will fit the 401 as will 360 and 390 parts. Now, 500 hp???? This is more than likely wishfull thinking. Perhaps an early 10.25 engine made 300 hp and could make a little more, but to expect 1.24 hp per cubic inch from a 400 inch motor with cast iron heads is, well a stretch. Not saying it can't be done, but a ton of money has to be spent to obtain those figures. This injected 401 with aluminum heads, roller cam, yada, yada barely makes 488 net Hp @ 5700 rpm. I say barely, that is a bunch of power. 500 is a big number. Attached Thumbnails

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