340 heads Info

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Darthemi75

Darthemi75

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i found this heads:
3418915-h, 3418915-g in a challenger 340 pistol grip, Why one have a H and the other a G?.... which valves size come on it...
Thanks
 
I've torn apart original engines before and noticed they had different letters on the end of the casting # like that. Maybe cast on a different shift??? Only thing I could ever think of.
 
70-72 340 heads. Standard fare known as J heads to most.

Could have 2.02 or 1.88 intakes.

Look on the runners for a casting date.
 
Maybe this will help. Sorry it doesn't line up perfectly.

Mopar Cylinder Head Casting Numbers casting# year engine(s) detail valves chamber
1406740 1958-1959 361 383 truck 1.94" 1.60"
1737622 1958-1960 350 361 383 1.94" 1.60" 73.5cc
1737635 1958 350 361 D-500 1.94" 1.60" 73.5cc
1844705 1958-1959 350 361 383 2bbl 1.94" 1.60" 73.5cc
1851509 1959 361 383 413 HP 4bbl 2.08" 1.60" 73.5cc
1851524 1958-1971 350 361 383 413 commerical
1944705 1958 350 361 383 413 commerical
2128521 1960 361 383 413 300F 2.08" 1.60" 73.5cc
2128522 1960-1961 361 383 non-HP 1.94" 1.60" 73.5cc
2202594 1958-1971 361 383 413 commerical
2206035 1964-1966 170 225
2206324 1960-1962 361 383 413 possible thru 1967?
2206924 1961-1962 361 383 413 300G 2.08" 1.60" 73.5cc
2264547 2960-1971 361 413 commerical
2268341 1965 426 passenger car
2402286 1962 413 Max Wedge 2.08" 1.88" 81.0cc
2402557 1963 413 300J 300K 2.08" 1.74" 73.5cc
2406158 1966-1967 440 non-HP 2.08" 1.60" 73.5cc
2406516 1964-1967 361 383 413 426 300L 2.08" 1.60" 73.5cc
2406518 1964 426 Max Wedge 2.08" 1.88" 86.0cc
2406740 1963-1968 361 413 marine and trunk (413)
2406780 1965-1967 383 truck
2408520 413 300K cross ram 2.08" 1.60" 73.5cc
2463200 1963 361 383 413 2.08" 1.74" 73.5cc
2463209 1963 426 Max Wedge
2465315 1964-1965 273
2466676 1971-1977 361 413 truck
2466676 1971-1977 361 413 marine
2531894 1968-1971 340 X-heads 2.02" 1.60"
2532080 1964-1965 273 1.78" 1.50"
2536178 1966 273 early 1966 1.78" 1.50"
2658234 1966 273 late 1966 1.78" 1.50"
2658920 1967 273 318 1.78" 1.50"
2780915 1967 383 440 closed chamber 2.08" 1.74" 73.5cc
2806887 426 marine and industrial
2843169 1967-1973 170 198 225 improved chamber design
2843675 1968-1974 273 318 1.78" 1.50"
2843906 1968-1970 383 440 "906" 2.08" 1.74" 79.5cc
2899913 1960-1971 361 413 truck
2899943 1971-1977 361 413 truck
3418915 1970 340 T/A 6bbl 2.02" 1.60"
3418915 1971-1972 340 J-heads 2.02" 1.60" 65cc - 73cc
3418915 1971-1972 360 J-heads 1.88" 1.60" 65cc - 73cc
3462346 1971-1973 383 400 440 "346" 2.08" 1.74" 79.5cc - 81.95cc
3614476 1979-1990 B/RB Stage IV
3614850 1971 198 225 hardened ex. seats, emissions
3671587 1973-1976 340 360 1.88" 1.60" 65cc-73cc
3698444 1975-1978 198 225
3698447 1975-1978 198 225
3698995 1972-1974 198 225 hardened exhaust valve seats
3751213 1973 400 440 motor home 2.08" 1.74" 81.95cc
3769902 1974 440 400 2.08" 1.74" 81.5cc
3769950 1975-1978 318 w/ air pump 1.78" 1.50"
3769973 1975-1976 318 1.78" 1.50"
3769974 1976 360 1.88" 1.60"
3769975 1975 400 440 2.08" 1.74" 83.1cc
4006335 1975-1978 318 w/o air pump
4006337 1976-1976 360 2bbl w/o air pump 1.88" 1.60"
4006452 1976-1978 400 440 "452" 2.08" 1.74" 81.5cc
4027598 1975-1978 225
4027600 1975-1976 225
4104362 1975-1976 225
4095778 1980-1982 225 hydraulic lifters
4027163 1977-1983 318 1.78" 1.50"
4027591 1975-1978 318 w/ air pump 1.78" 1.50"
4027593 1977-1983 318 1.78" 1.50"
4027594 1977-1978 360 4bbl w/ air pump 1.88" 1.60"
4027596 1981-1983 318 HP (cast-in 360) 1.88" 1.60" 66cc - 72.5cc
4041001 1975-1978 318 w/o air pump 1.78" 1.50"
4041003 1976-1981 360 2bbl van, truck, w/o air pump 1.88" 1.60"
4071047 1977-1978 360 4bbl w/ air pump 1.88" 1.60"
4071049 1977-1978 360 4bbl w/o air pump 1.88" 1.60"
4071051 1981-1983 318 HP
4095778 1981-1983 198 225
4100405 1979-1981 318 w/ air pump 1.78" 1.50"
4100408 1979-1980 360 4bbl w/ air pump 1.88" 1.60"
4100409 1979 360 4bbl w/o air pump 1.88" 1.60"
4100409 1979-1980 360 4bbl w/ air pump 1.88" 1.60"
4104362 1979-1980 198 225
4323302 1985-1987 318 2bbl swirlport 1.78" 1.50" 56cc - 65cc
4323345 1985-1987 318 4bbl roller lifter 1.88" 1.60" 69cc - 77cc
4323475 1985-1987 318 4bbl 1.88" 1.60" 69cc - 77cc
 
Darthemi75 said:
i found this heads:
3418915-h, 3418915-g in a challenger 340 pistol grip, Why one have a H and the other a G?.... which valves size come on it...
Thanks
Click to expand...

Those would be 340 6 pack heads, they use 2.02 and 1.60 valves. Also, they use offset rockers...
 
72bluNblu said:
Those would be 340 6 pack heads, they use 2.02 and 1.60 valves. Also, they use offset rockers...
Click to expand...

Not necessarily. The 6 pack heads were also 915 casting, but had different machining done for the offset rocker and the required altered pushrod holes.
 
Look at the above chart. They can only be one of the three listed.
 
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