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6X Heads?
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Posted: 10/29/09
01:31 PM
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Going to rebuild a 455. I have a set of 6X-4 Heads. Also have another set of 6X but one is marked 6X-4 and the other is 6X-8.
Is there a difference in 8 and 4?
Thanks!
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Posted: 10/29/09
01:39 PM
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The 6X-4 has 91cc chambers and the 6X-8 has 101cc chambers.
professional hi-performance engine builder
Horsepower sells engines and torque wins races
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Posted: 10/29/09
01:42 PM
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OK Thanks! I can't wait to drop this baby in my 79 TA!
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Posted: 10/29/09
01:46 PM
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No problem.
professional hi-performance engine builder
Horsepower sells engines and torque wins races
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Posted: 10/29/09
04:57 PM
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Best to use the -8 heads on a 455 for streetable compression ratio.
Steve
Trying to help... 'cause we don't all have to learn the hard way!
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Posted: 10/29/09
06:09 PM
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Question...What would be the comp ratio if I go with the -4's? My understanding is that this would put me at about 9.5/1 ratio.
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Posted: 10/29/09
06:41 PM
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Thought I should add...I plan on running with 92 octane gas.
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Posted: 10/30/09
03:03 AM
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Depending on bore,head gaskets being use,piston head volume and deck height you will yield around 9.5-10.3:1cr.
Can't say exactly until you list some part numbers and specs on the above info.
professional hi-performance engine builder
Horsepower sells engines and torque wins races
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Posted: 10/30/09
07:50 AM
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OK, Thanks! Pretty sure it will be .040 over. TRW forged pistons but I don't know the exact model number yet. I'm still a newby when it comes to selecting heads, pistons cams, etc. This forum has been great. Doing alot of reading lately.
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