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Browsing this Thread:   1 Anonymous Users





Tidy_1200
Re: A14 question
#4
Home away from home
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2012/1/13 10:23
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not sure what was on there before as I just bought the bottom end and have an A15 H89 head in the garage, cheers guys

Posted on: 2014/1/3 15:36
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Daily: 2000 Holden VX Calais 5.7L GenIII
Datto: 1972 Datsun 1600 L20B twin 40 DCOE Webers
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ddgonzal
Re: A14 question
#3
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H89 were also fitted to A14 from the factory. H89

Quote:
H75: 31cc
H89: 29-31cc
Chamber Size

Posted on: 2013/12/30 20:57
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clyons8
Re: A14 question
#2
No life (a.k.a. DattoMaster)
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From East New Britain, Papua New Guinea
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What cylinder head did you have on there before?

If you previously had the H75 then yes, it will raise the CR slightly. If you had the round port thrift head no, a H89 will not change the ratio, it will remain the same.

To raise the compression ratio you can machine the head, fit flat top or domed pistons, install flat faced valves or purchase a performance head gasket which is slightly thinner than the standard.

Posted on: 2013/12/30 20:03
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Tidy_1200
A14 question
#1
Home away from home
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will a H89 head off an A15 raise the compression on an A14?

Posted on: 2013/12/30 16:58
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Daily: 2000 Holden VX Calais 5.7L GenIII
Datto: 1972 Datsun 1600 L20B twin 40 DCOE Webers
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