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n.g.l.

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Member #: 181
Senior Member

Chard, Somerset

11th Mar, 2010 at 01:13:59pm

21253 will give a CR of 10.5:1 and was used in the MG Metro.
21250 will give a CR of 10.0:1 and was used in Unleaded versions of the MG Metro
21251 will give a CR of 8.8:1 don't use these they're shit.
All have 9cc dishes but different pin to crown heights to achieve the different ratios.
Are you planning on using the 21253's in a boosted engine?
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