340 heads So it's been a while OMG great changes.

[rumrunner70]

So I've had this motor for quite some time came out of a 68 Barracuda Fastback four-speed car apparently was original motor to the car . Years later I finally tore it apart and just noticed the cast stampings one was a Z and the other one looks to be a O has anyone ever come across something like this also the Z also has a TA stamped in it.

 

[Challenger RTA]

The two locations in which you can find the casting numbers on Mopar cylinder heads. top and bottom of intake runner. Numbers matter more than letters.

LA Small-Block Mopar Cylinder Head Casting Numbers

2268341 – 1962-1967, 318 LA-series small-block, 1.84/1.56 valves

2465315 – 1964-1965, 273 LA-series small-block, 1.78/1.50 valves

2532080 – 1964-1965, 273 LA-series small-block, 1.78/1.50 valves

2536178 – 1966, 273 LA-series small-block,1.78/1.50 valves, early

2658234 – 1966, 273 LA-series small-block,1.78/1.50 valves, late

2658920 – 1967, 273 LA-series small-block, 1.88/1.50 valves

2658920 – 1967, 318 LA-series small-block, 1.78/1.50 valves

2658234 – 1967, 318 LA-series small-block, 1.78/1.50 valves

2843675 – 1967, 318 LA-series small-block, 1.78/1.50 valves

2843675 – 1968-1969, 273 LA-series small-block, 1.78/1.50 valves

2531894 – 1968-1970, 340 LA-series small-block, 2.02/1.60 valves

3418915 – 1970, 340 LA-series small-block, 2.02/1.60 valves, 63cc-73.5cc, T/A

3418915 – 1970-1972, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

3418915 – 1971-1972, 340 LA-series small-block, 1.88/1.60 valves

3462598 – 340 LA-series small-block, Trans-Am, 63cc-73.5cc

3671587 – 1973, 340 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

3671587 – 1973-1974, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

3769950 – 1975-1978, 318 LA-series small-block, 1.78/1.50 valves, w/ air pump

3769974 – 1975-1976, 360 LA-series small-block, 1.88/1.60 valves

3769973 – 1975-1983, 318 LA-series small-block, 1.78/1.50 valves

4006335 – 1975-1978, 318 LA-series small-block, w/o air pump

4027591 – 1975-1978, 318 LA-series small-block, 1.78/1.50, w/ air pump

4006337 – 1976-1976, 360 LA-series small-block, 1.88/1.60 valves, 2bbl w/o air pump

3671587 – 1976, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

4027569 – 1977-1986, 360 LA-series small-block, 1.88/1.60 valves

4027163 – 1977-1986, 318 LA-series small-block, 1.78/1.50 valves

4027593 – 1977-1984, 318 LA-series small-block, 1.78/1.50 valves

4027594 – 1977-1978 360 LA-series small-block, 1.88/1.60 valves, 4bbl w/ air pump

4027163 – 1980, 318 LA-series small-block, 1.78/1.50 valves

4027596 – 360 LA-series small-block, 1.88/160 valves, 66cc-72.5cc

4027596 – 318 LA-series small-block, 1.88/160 valves, 66cc-72.5cc, High Performance

4041001 – 318 LA-series small-block, 1.78/1.50 valves, w/o air-pump

4041003 – 1976-1981, 360 LA-series small-block, 1.88/1.60 valves, 2bbl van and truck, w/o air pump

4071047 – 1977-1978, 360 LA-series small-block, 1.88/1.60 valves, 4bbl w/ air pump

4071051 – 1977-1980, 360 LA small-block, 1.88/1.60 valves

4071051 – 1981-1983, 318 LA-series small-block, High Performance

4100405 – 1979-1981, 318 LA-series small-block 1.78/1.50 valves, w/ air pump

4100408 – 1979-1980, 360 LA-series small-block 1.88/1.60 valves, 4bbl w/ air pump

4100409 – 1979 360, LA-series small-block 1.88/1.60 valves, 4bbl w/o air pump

4100409 – 1979-1980, 360 LA-series small-block 1.88/1.60 valves, 4bbl w/ air pump

4323302 – 1985-1986, 318 LA-series small-block, 1.78/1.50 valves, Fast Burn, 56cc -65cc

4323345 – 1983-1986, 318 LA-series small-block, 1.78/1.50 valves, Police, roller, 69cc – 77cc
4323475 – 1985-1987 318 LA-series small-block, 1.88/1.60 valves, 69cc -77cc, 4bbl

 

[rumrunner70]

 

[rumrunner70]