The main difference between the HC and LC engines is in the pistons. The LC
pistons have quite a dip or depression. There are other differences that
come into play in the 18V engine series but that was the initial change in
1971.
When I did my overhaul, I replaced the pistons with the standard HC (9:1)
pistons. The depression was not as pronounced.
David
71 BGT
>
>Hi all,
>
>Just been talking to Rick about this but thought I'd also bounce it off the
>list.
>
>Is the only difference between LC and HC motors the size of the Combustion
>Chamber volume? Bently says it's between 42.5cc and 43.5cc but doesn't
>actually say why - I'm guessing it's HC vs LC. I guess the head itself
>would be the same dimensions because if it was skimmed surely the pushrods
>would be different between a HC and LC motor, throwing the valve geometry
>
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