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#1
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6x heads
what are better heads for 69 400 6x-4 or 6x-8
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#2
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6x-4 91cc 8.69:1 compression ratio on a standard 400
6x-8 98cc 8.21:1 compression ratio on a standard 400 The 6x-8's are great heads for street performance.. especially after you have them milled to increase the CR. .050 inch off will lower the combustion chamber size by about 10cc's... 81cc chambers would give you 9.5:1 CR... perfect for the street and they will still live on high octane pump gas
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"Keep your foot hard on that pedal Son, never mind them brakes Let it all hang out 'cause we got a run to make!" |
#3
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I think he meant to say 6x-4, not 8.
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69 firebird |
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