Casting # C.I. Year Stroke
8120510 401 72 3.680"
4488664 401 71 3.680"
4487238 390 70 3.574"
3208795 390 68-69 3.574"
Engine:
Code: Comments:
290-2V H
Na
290-4V N
Na
304-2V H
Na
343-2V S
Na
343-4V Z
Na
360-2V N
Na
360-4V P
Na
390-4V W
1968-69
390-4V X
1970
390-4V Y
SS,AMX & Machine
401-4V Z
Na
* The seventh digit of the vehicle identification number indicates
the type of engine used in that model. The number is located on the
left front door panel or the upper left corner of the instrument panel.
Engine Specifications
CI Bore Stroke Firing Order Distributor Rotation
304 3.750 3.438 1-8-4-3-6-5-7-2 CW
360 4.078 3.348 1-8-4-3-6-5-7-2 CW
390 4.172 3.570 1-8-4-3-6-5-7-2 CW
401 4.170 3.680 1-8-4-3-6-5-7-2 CW
AMC Block Casting Numbers
Year: C.I. Casting #
69
290 4486278
70-72 304 4487211
69
343 4486279
70-72 360 4487212
70
360 4487212
68-69 390 4486280
70
390 4487213
71-72 401 4488874
Click Here For More Block Casting Numbers
Engine Size & Maximum Recommended Over-Bore
290 & 304 343 & 360 360 SPL 390 & 401
0.1250"
0.0450"
0.1075"
0.0225"
* All AMC Blocks Are Basically The Same In Design. The Major
Difference Among The AMC Blocks Are The Bore Diameters And
The Deck Heights. 1970-72 Blocks Have A Deck Height Of 9.208".
1966-69 Blocks Have A Deck Height Of 9.175". Push Rod Lengths
Also Differ Between The 71-72 And 69-70 Models, So Make Sure
You Choose The Corresponding Parts.
AMC Torque Command is for the most part a "904" and 727 Torqueflite with an American Motors bellhousing. This unit is a good performance transmssion as well as the GM T-400 version with the AMC bellhousing. both are one-peice aluminum transmissions. The bellhousings are not removable.
Four Speed
The Super T-10 was produced with many different gear ratios and more improvements for strenth and reliability. The first design had case flexing problems, so the second design case was made of nodular iron with a side cover made of cast iron. The tailshaft extention was made of aluminum and the mainshaft and input shaft diameter was increased for greater torque capacity. The input shaft and the mainshaft have more splines, which help fight shaft twisting. These boxes also have wide cut, course pitch gears for greater strength. The second design Super T-10 became standard equipment in AMC, Ford, and GM. The AMC box has a 28 spline input shaft. Super T10 AMC Series weighs about 93lbs.
AMC Design Series T
1st Gear 2.64
2nd Gear 2.10
3rd Gear 1.46
4th Gear 1.00
