Ok here is the scoop... Timing is as 8 degrees btd center 32 degress at 3000 rpm.<br />We have checked double checked the timing. Carb changed props. <br />Boat runs starts idles runs low rpm great. <br />Tested again with 600CFm top rpm. Had the carb cleaned checked etc to make sure its good. <br />Put a Edelbrock 5000 intake manifold on. <br /> <br />3600RPM with 21 Mirage<br />4000 RPM with 19 pitch <br />Clean Bottom, bottom painted. <br />Exhaust seems fine with no restrictoons. <br />The old motor ran a 21 Mirage at 4700 RPM approx 50mph<br /><br />Fuel pressure 5.5 6lbs<br />All fuel lines are good and clean <br />Fuel filters are all good<br />The anti siphon seems to be working fine. <br />checked the linkage it is fully extending. <br /> <br />We put a 750 Holly on just to test the possibility of the the cab being to small. <br />Zero change <br /><br />Can anybody think of anything else we can check. <br />It just never gets going. I really think we should be able to get the rpms higher? With more power behind it. <br />The guy we got the motor from says its at least 310 horse. We are simply baffeled at any other things that could be hosing it up. <br />Thanks very much in advance.
), or from improper break in.