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Spitfires List Archive

Spitfire Head

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Mail From: Roger Elliott <(email redacted)>

Hi,
I have an 80 Spitfire that I am thinking about taking the head off so I
can bump the compression to somewhere around 9.0 - 9.5 from the stock 7.5.

I rebuilt the lower end several years ago, but did not touch the head as
it was judged to be in fine shape and I did not have spare money at the
time. I am pretty sure the head is stock, but is there a way to verify
that before taking the head off?

I know that the only way to tell for sure is to measure the volume with
the head off, but I would hate to take the head off, then find out it
was already at 9.0 compression. So I would like to sort of confident
that there was a good reason for me to take the head off.

Thanks,
Roger Elliott
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Mail From: "Nolan" <(email redacted)>

Remove a spark plug and you can look down inside the combustion chamber with
a flashlight. Look to see if the piston is dished or flat. I'd suggest
removing all the plugs to make it easier to hand crank the engine for ease
of viewing.

Check the stanpart number on the head. Paul G did a bit of study on the
various high compression heads and has some information on them,
particularly on the height of the head and the numbers.
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