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i have a 1995 Thundercat with a Black Magic Big Block mono head, i was just wondering what the compression ratio for them were. The inserts say 34cc if that helps. Should they be ran on 93 or 110 race fuel or what and about how much more power do they give. thanks for any replies.
 

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hi was reading an old post where you had 34cc inserts. i have a 98 T-Cat with 36.7cc inserts,BM pipes. my question is what gas did you have to run in sled and any idea what i should run? asked some guys that had the last BM catalog and they list them at 38.4 trail,36.2 lake,and 29.2 race.thanks
 
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