Is lowering Compression bad?
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Joined: Feb 2001
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From: Freehold,NJ
Is lowering Compression bad?
There are some L98 heads for sale with a compression of 64cc, will this be lowering my compression or raising it, and is either bad, cause I have bad valve guides and need new heads. Thanks
Senior Member
Joined: Mar 2001
Posts: 841
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From: Silverhill,Al
Car: 92 Camaro RS
Engine: 305 TBI
Transmission: T-5
Take them to a good automotive machine shop and have them milled (about .04 to .045) to 58cc chambers, and have the intake surface of the head milled too so the intake will match up ok.
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92 Camaro RS 5.0 5-Speed (Quasar Blue)
T-Tops
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust
74 Dodge Dart Sport 360 (11.2 1/4 mile)
2000 Dodge 1500 Ram Sport
[This message has been edited by DartByU (edited July 08, 2001).]
------------------
92 Camaro RS 5.0 5-Speed (Quasar Blue)
T-Tops
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust
74 Dodge Dart Sport 360 (11.2 1/4 mile)
2000 Dodge 1500 Ram Sport
[This message has been edited by DartByU (edited July 08, 2001).]
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From: USA
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Going from 58cc to 64cc will lower the compression about .5 points. It's better for cheap gas. 
Bad for performance. 
Although not REAL bad. The better flow of the heads (depending on what you have now) might make up for the difference, plus some (maybe). But then it would be a waste of time and money.
About the only thing where "the ends would justify the means", would be if your upgrading to a better cam and intake also.
Bad for performance. Although not REAL bad. The better flow of the heads (depending on what you have now) might make up for the difference, plus some (maybe). But then it would be a waste of time and money.About the only thing where "the ends would justify the means", would be if your upgrading to a better cam and intake also.
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