feeler thread for 340 engine

72Swinger360 said

This info was taken from AllPar.com.1972 - The 340 four-barrel dropped to 240 horsepower:Compression dropped to 8.5:1; the compression height of the piston via wrist pin location changed by 0.10”The crankshaft was switched from forged to cast somewhere in the production cycle, believed to be in early April 1972, with engine 39118000 (thanks, Karl Thomas); a milder camshaft was used340/360 were moved to “J” casting heads with 1.92” intake valves; exhaust valves remained the samePaint went from orange to corporate blue

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That is wrong information. All 340 camshafts were the same except for the 1968 manual transmission. The 1972 340 "J" heads used 1.88 Premium intake valves, not 1.92. All 360's had "J" heads from 1971 till about 1973 with standard 1.88 intake valves. I have personally blueprinted two untouched original 1972 340's and know that what I say is correct. Both had forged cranks, but I do not know what the production dates were. In my mind, it makes all other information suspect.