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Message: <blockquote data-quote="tooslow" data-source="post: 246763" data-attributes="member: 9239">yeah, our engines just can't handle high compression and boost.it is detonation that needs to be feared, not heat from the blower.how much compression and how much boost an engine can handle varies. for most modulars you don't want much more than 9.5:1. how much boost will depend on compression and also blower size(cfm) before knowing how much psi of boost you can safely run.now, not all boosted engines are limited to such low compression. again, it is detonation that kills, so engines with extremely well designed heads and combustion chambers can run higher levels of boost and compression without fear or detonation. one example is newer Audie engines (forgot their name) that are factory turboed with as much as 12:1 on at least one DGI version.the modular engine doesn't have that luxury. keep it around 9:1</blockquote>