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221 liberator 454 king cobra speed issue

porsche87

New member
i have a 221 liberator with 45

i have a 221 liberator with 454 king cobra with 90 hrs on it my prop pitch is 14x21 and the top speed with 4800 rpm is 43 mph gps people have told me i should be getting 55-60mph what should i do ?
 
hey i found that the knock sen

hey i found that the knock sensor was keeping the engine at 52 degreese advanced cause when someone installed the engine they epoxy the sensor to the block so maybe that is the speed issue i haven't put it in the water yet
 
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