Mopar 340 Engine Serial Numbers
![Mopar 340 Engine Serial Numbers](https://kumkoniak.com/57.jpg)
![Mopar 340 Engine Serial Numbers Mopar 340 Engine Serial Numbers](https://phirecrystal.weebly.com/uploads/1/2/3/9/123983698/895884329.jpg)
Some of the 1970 340 Six-Pack engines had heads with a U or O casting letter in addition to the J, but they were still the same part number (the T/A head had the intake valve pushrod holes drilled in a offset location). I own three 340s one engine has genuine X heads and the other two have AAWJ 360 with the 1.88 intakes removed and the 2.02 stainless valves and the intake runners worked to match the larger foot print X head gasket outline.ģ40 V-8 engine parts identification (Steve Silver) Micomlar wrote: "The windage trays supposedly resulted in an approximately 650 to 800 fouth gear top end finish improvement, but were suspected to cause some damage as they starved some critical bottom end components, unless the engine was in peak mechanical shape. Did a 3-1 kickdown, hit a bump, and ended up looking him right in the eyes! He refused to move until I was almost out of sight.Īs for design, all I can tell you is big valves, a big cam, and a high compression ratio. I pulled out to pass a slow guy going about 40 on my way to work. My 1971 Duster 340 was a bear in a straight line but try a little throttle in a turn and wheelhop off the road.
![Mopar 340 Engine Serial Numbers Mopar 340 Engine Serial Numbers](http://findclassicars.com/uploads/carphotos/1971-plymouth-duster-340auto-8.jpg)
My commute was made a joyful dash in that car. The car was as light on its feet as most sports cars. For just driving pleasure that was my favorite muscle car. The 360 shot up from 175 hp to 245, in the four-barrel high performance version, which got the old 340 cam - even if the intake valves were still 1.88 inches.Ĭhrysler's Pete Hagenbuch wrote: I drove a 1972 Road Runner with the 340 for a year. The lighter side is that some of the 340's components were used in a high-output version of the closely-related 360 cubic inch V8 in the 1974 cars. The engine gained 5 pound-feet of torque in the 1973 model year that would be its last performance. The 340 was still the LA power king, with 240 gross horsepower and 290 lb-ft of toruqe - when the 360 was rated at 175 hp and 285 lb-ft. To meet 1972 model-year emissions rules, the 340 was detuned the compression was dropped to 8.5:1, and the intake valves were smaller. ** According to preliminary 1971 materials * 1971 press release stated 305 lb-ft net at 2800 rpm, 1971 brochure listed 310 3200. 360 heads were used in the 1970 340 Six-Pack AAR/TA, which had the same size valves. This one used an unsilenced air cleaner, rather than the dual-snorkel one used in the four-barrel it was only sold in the Plymouth AAR 'Cuda and Dodge Challenger T/A.įor the 1971 cars, the 340 (and the 360) came with the "J" type heads, using a single casting, with different machining for the different sized valves. The 10.3:1 compression ratio (according to 1971 brochures) was far above the 318's 8.8 and the 360's 8.7.Ī six-barrel version (with three two-barrel carburetors) brought higher-performance heads, new valve covers, and material added to the bulkheads to allow for four-bolt main bearing caps. Valve lift was 0.430" intake, and 0.445" exhaust. Ed Poplawski wrote, though,įrom Plymouth dealer book - gross horsepower, torque listed.ġ970-71 engines were painted orange they changed to blue very late in the 1971 model year the camshaft on automatics had a 268° intake and 276° exhaust opening duration, with 44° overlap (manuals had 276° intake, 284° exhaust, 52° overlap). The 340's initial power rating was 275 horsepower, gross. a revised oil pump with a 90 degree adaptor.thicker bulkheads and higher main bearing caps to strengthen the bottom end.a forged steel crank (through 1972's engine #39118000, when a cast iron crank was used).a viscous fan drive to cut power loss at high speeds.Big 2.02 inch intake valves and 1.60 inch exhaust valves, vs the 318's 1.78 intake and 1.50 exhaust.
![Mopar 340 Engine Serial Numbers Mopar 340 Engine Serial Numbers](http://smclassiccars.com/uploads/postfotos/1970-plymouth-039cuda-340-rotisserie-resto-numbers-matching-engine-trans-13.jpg)
a dual timing chain with a windage tray to improve top end engine RPM by keeping the crank counter weights from churning the oil in the pan.Separating the 340 from the standard-performance 318 were not just 22 cubic inches, but also: When the 340 came out in late 1967, it was a street fighter from the start. The valves were as large as possible, which meant moving the spark plugs ever so slightly (0.08") further out. The design was guided by Tom Hoover, later known as "father of the Hemi " based on engine analyses, he set the bore size at 4.04", though the cylinders were just 4.46" apart.
![Mopar 340 Engine Serial Numbers](https://kumkoniak.com/57.jpg)