AAR Engine specs

[B5blueGC]

Is there a place where I can see the specs for the AAR 340 engine? Compression, cam specs, etc. I don't have a TA block (original engine was destroyed before I got the car) so will need to get as close as possible with a standard block.

Thanks.

 

[Challenger RTA]

For the 1970 Dodge Challenger T/A, the 340 Six Pack engine was the standard engine. No other engine options were available. The engine was factory rated at 290 horsepower at 5,000 RPM and 345 ft. lbs. of torque at 3,400 RPM. The compression ratio was 10.5:1 and it had three 2 barrel carburetors.
The engine code was E55. The specifications.

Specifications	340 Six Pack
Displacement	340
Bore and Stroke	4.04″ x 3.31″
Horsepower	290 @ 5,000 RPM
Torque	345 @ 3,400 RPM
Compression Ratio	10.5:1
Camshaft	High lift, high performance
Cam Duration/Overlap	268°/276°/44°
Cam Lift	.429″/.444″
Lifter Type	Hydraulic
Valve Diameter, Intake	2.02″
Valve Diameter, Exhaust	1.60″
Carburetion	Three Holley 2-bbl
Air Cleaner	Unsilenced
Exhaust System	Dual, low restriction
Fuel Recommended	Premium

1970 Dodge Challenger T/A With a 340 Six Pack​

The 340 Six Pack was the only engine for the 1970 Challenger T/A. This was the first and only year for the Challenger T/A and the 340 Six Pack engine.


There were some differences between the 340 Six Pack and the 340 4 barrel. The Six Pack had the following:

• Three 2 barrel Holley carburetors.
• Edelbrok aluminum intake manifold.
• The block was reinforced with additional material in the main bearing webs so racers could modify it to 4 bolt mains.
• Cylinder head castings were modified (pushrods holes) so racers could expand the ports.
• The valve train used different rockers (adjustable and offset) and pushrods (longer) to accommodate the heads.
• That’s the complete list of engines available for the 1970 Dodge Challenger T/A.
• Article Resources
  
  • Plymouth Technical Service Bulletin No. 70-25-8
  • Dodge Technical Service Bulletin No. D70-25-2
  • Dodge Product Information Bulletin #11A
  • Dodge Challenger T/A Price & Order Information Bulletin
  • Dodge Challenger T/A Information Booklet
  • 1970 Dodge Service Manual
  • Google Books: Chrysler Engines 1922-1998

 

[MoparCarGuy]

Is there a place where I can see the specs for the AAR 340 engine? Compression, cam specs, etc. I don't have a TA block (original engine was destroyed before I got the car) so will need to get as close as possible with a standard block.

Thanks.

Stick with a 1968-1970 engine. Consider a 1970 engine (painted Street Hemi Orange) for your AAR if you can source one. The early-340 engines have the forged crankshaft and are internally-balanced.
The automatic cars have neutral-balanced torque convertors as well.

The later 340 engines (painted Chrysler Blue) have cast-crankshafts and are externally-balanced (harmonic balancer must match). Automatics get special torque convertors with weights.

Someone else can chime in about the 1971 340 engines which were painted Chrysler Blue as well. 1971 340s are also forged crankshaft and internally-balanced but you could make a mistake with those and end up with a 1972 or 1973 340. Check the Engine Identification numbers and casting dates. REFERENCE

Any of the 340-360 engines could be made into a similar looking 1970 340 when painted orange with the 2.02/1.60 valve X or J heads installed.
Finding T/A heads and a T/A block would be a very, costly endeavor as you probably already know.
2nd photo below is a 1970 340 engine ID stamping for FW340P31060544. Note there is no small "s" in the non-T/A 340 block ID stamping.

 

[B5blueGC]

Thanks to all. Been looking for the early year block. I have a 72 block that I have done to replace my bad 318 in my Gran Coupe. Thanks for the stamp information on the front. I usually looked at the production date but this is good to know.

 

[Challenger RTA]

Sometimes +++time x -$ = loss of smiles per mile. Other times ---time x +++$= more smiles per mile. In other words the equation works out to. Buy any 340 block and stoke it and be done. It might take longer to find a forged crank then just getting it done. Ask someone here that as done it.

 

[MoparCarGuy]

I agree with Challenger RTA on the stroker kit. A 340 to 416 CID engine kit will make great power.
Disguise it, if you wish, with a stock look and get the car back on the road.