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Search: Posts Made By: Paxtonspeed
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Forum: General Q & A
04-25-2018, 07:27 AM
Replies: 5
Views: 2,169
Posted By Paxtonspeed

My stock Merc 5.7 EFI runs on 87 and has 9.3:1. A...

My stock Merc 5.7 EFI runs on 87 and has 9.3:1. A lot depends on how much timing you are running and what the heads are made out of. With cast iron heads and 9.5:1, start giving it some timing and...
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