Corvette started with 6cylinders. 55-56 ----265 , 57-61 -----283, 62-64----327 , 65----327&396, 66-68----327&427, 69----350&427,70-75----350&454 76-on 350 until the Z06.Doing this from memory so might have left something out like in 57 you could have gotten a 265,not many did