-9 High Compression '63 XKE 3.8
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-9 High Compression '63 XKE 3.8
I have been led to believe that most 3.8 XKEs were -8 models. -8 referring to an 8 to 1 compression ratio. I also have learned there were -7 models, but none were sent to the US. My '63 XKE Series 1, 3.8 is a -9 (9 to 1 Compression). All the numbers match my chassis. Does anyone have any idea how special this might be if special at all?
Last edited by GusRiley; 08-24-2018 at 10:38 PM.
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GusRiley (09-11-2018)
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Actually the only difference between the 9:1 and the 7 or 8:1 compression head is the number stamped into the head, i.e. there the same head RXXXX-7,8 or 9. The compression ratio is mainly controlled by the size of the dome/crown of the pistons. You could have a head that claims to be 9:1 compression ratio but if it was rebuilt with 8:1 compression pistons then the engine is really 8:1. Except when the head is shaves then it would be somewhat higher than 8:1. Some people rebuild their engines with 8:1 CR pistons because of the lower octane that is around today.
Last edited by Bob_S; 09-12-2018 at 06:47 PM.
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GusRiley (09-12-2018)
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