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Increasing horsepower

whalerboy

New member
For years I've followed performance modifications performed on Cummins 6BT diesels. Some simple, cheap, effective without hurting reliability or longevity.
A friend has recently purchased a 20' cc with a Perkins M90. Not a rocketship by any means. I know the marine application is harsher on these motors. Just wondering if anyone has tips or experience in tweaking a bit more hp out of this motor........Thanks
 
The early series of the m90 the 4.236 was turboed for some applications, they where not know for there reliability or longevity unlike the natural breather.
 
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