AMC 401 build

[Saltwater Cowboy]

I have a 360 with a broken rod that I was going to build but a 401 came my way (cheap enough that I can't say no). The motor ran like a top when it was pulled so I am not going to do a lot to it before I drop it in. Here is my question, the 360 came with R4B intake with a stock Q-jet turned backwards, RV cam (don't know the specs but I will get them), fenderwell headers, and Ford Mallory Ign. Can I use these parts on the 401? Is the Q-Jet enough carb, should I use the stock Motorcraft 4 barrell, or Truck Avenger? Is the stock cam in a 401 the same as a stock 360? Are the heads the same? Both are late '70's motors and they came out of Cherokees. Thanks for the info

[tufcj]

Everything will swap. Definitely keep the R4B, dump the q-jet. I have no experience with the truck avenger, but I hear it's a good carb. Heads are the same, the 401 has a slightly bigger cam from the factory.

Bob
tufcj

[ironman_gq]

the q-jets were good carbs but hard to work on compared to the other carbs. They came in either a 750 or 800cfm version depending on if they were on a car or truck originally. If the q-jet works good now I see no reason to spend the extra money on a new carb.

[Saltwater Cowboy]

Well it looks like I am going to swap the intake, ign., headers, and try the Q-jet out. I don't really want to mess with it much if I don't have too. What kind of HP and Tq numbers do these motors put out anyway?

[MoPedal]

Well it looks like I am going to swap the intake, ign., headers, and try the Q-jet out. I don't really want to mess with it much if I don't have too. What kind of HP and Tq numbers do these motors put out anyway?this would be a good link to go to for some of your answers. http://en.wikipedia.org/wiki/AMC_V8_engine#401

[AMX69PHATTY]

401 cam is a little ""bigger" as mentioned.
It has more lift & "dual pattern" duration, different exh & int,
where the 304/360 cam is a single pattern.

AMC Cams from 1973 TSM

304 / 360

14.75° .... BTDC Intake Opens
68.75° .... ABDC Intake Closes
263.50° ... Intake Duration
0.266" ..... Intake Lift - Cam
0.426" ..... Inatke Lift - Valve

56.75° .... BBDC Exhaust Opens
26.75° .... ATDC Exhaust Closes
263.50° ... Exhaust Duration
0.266" ..... Exhaust Lift - Cam
0.426" ..... Exhaust Lift - Valve

41.50° .... Valve Opening Overlap


401

25.57° .... BTDC Intake Opens
90.75° .... ABDC Intake Closes
296.32° ... Intake Duration
0.286" ..... Intake Lift - Cam
0.458" ..... Intake Lift - Valve

80.80° .... BBDC Exhaust Opens
42.75° .... ATDC Exhaust Closes
303.55° ... Exhaust Duration
0.286" ..... Exhaust Lift - Cam
0.458" ..... Exhaust Lift - Valve

68.32° .... Valve Opening Overlap

[Saltwater Cowboy]

Alright, I got the cam out of the 360 and it is a speed pro 1026R. 204/214 duration @ 0.050, 448/472 lift, and 110 lobe sep. I don't see a reason to put this in the 401. The reason being there is not enough to gain over the stocker. Besides I think a stock 401 with a R4B intake, headers, and Mallory ign. should be more than enough power for a CJ 7 with 40" boggers. I am now thinking that the HD rear output for my Dana 300 would be a good idea. With these upgrades what kind of power should this thing put out anyway?