Re: [Chevelle-List] question: power steering pumps & 327/275 horse motors?

[Z16CHEVELLEGUY]

Paul:
the #3890462 late 1966 combustion chamber had 62.076 cc for all.the #3917291 has two versions / 1.94/1.50 / 63.305 cc and 2.02/1.60 / 63.995 cc.the combustion chamber was enlarged slightly on the 2.02 version. the valve guide boss diameter was increased to . 410 to accept the 2.02 / 1.60 valves.the book shows the #3892657 for most 1967 327/350 motors. the #3903352 was used mid to late 1967.the #3914660 was used prior to Feb 29,1968.the #3914678 was used for all small blocks except for the 307.this motor was used more prominently during the 1968 model year.
                                                                  Larry