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6-71 vs 8-71 blowers

7K views 5 replies 6 participants last post by  alittle1 
#1 ·
i need to no if i should use an 8-71 or 6-71 blower on my 68 gto's 400 cui engine
 
#3 ·
A roots type 6-71 over 400 cid will be fine for a street deal with a driver frendly blower cam and stock flowing heads.If you build the engine with a big stick and honking cyl heads..the additional cfm the 8/71 delivers will allow you to underdrive the unit vs the 6/71 and reduce intake charge temp and ward off detonation issues.
 
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