Re: L78 cam specifications
Hope this helps:
1966 = 396/375 HP-M lifter/.520 intake lift/.520 exhaust lift//336 intake duration//336 exhaust duration//1.70 rocker ratio//3863143 part number//3863144 casting number//OMO casting symbol
1967 = M-lifter//.520 IL//.520 EL//316 ID//302 ED//1.70 RR//3904362 PN//3904366 CN//OMO CS
1968 same as 1967
1969 = M lifters///.520 IL//.520 EL//316 ID//302 ED//1.70 RR//3863143 PN//3863144 CN//OMO CS
From Chevy by the Numbers 65-69
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