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My 25 runs approx that with a single 383 mercruser.

I have a 383 mercruiser single inboard , tons of low end torque for a 25. Gets on top quick.

I get 1.9 mpg , running around 2800 rpm at 22 mph. Single 383 ,1.52 velvet drive, 4 blade ,total inboard. Doesn't change much between 14mph and 24 mph.

Dan Cole is a good surveyor , know him personally.

I live 1 hour north of Panama city fl. ,also own a home on beach there. Is boat in question by chance a 45 hatteras?

He finally got it to move , soaked in rust penaTrent . Must have got a dab of salt water blown in exhaust.

My brother has a 1973 45 Hatteras with huge detroits. Boat survived hurricane Michael but now one engine won't turn over. Pulled injectors seems to be dry, boat did not take on water. Boat was beat up in marina pretty good. Any ideas appreciated? Boat ran day before storm.

I have a custom 25 single Chevy 383 inboard. A new100 gallon aluminum fuel tank was installed against transom and a custom cabinet type cover around it . Only sticks in from top cap about 12 inches.

Just can't understand why double 4.3s aren't plenty? Checked my 25 Saturday runs 21 mph at 2500rpm and 31 mph at 3600. With a single screw 383. Are 26s that much heavier?

Scot, I really wish I knew how to post pictures of my 25 inboard conversion, or take u for a ride. Think u could get some ideas on yours. Been a mechanic all my life , but still new to this boat thing . Not very good at explaining it. My boat had a 454 prior to the 383 mercruiser . I feel prop , tra...

I have a dumb question I keep seeing 1.5 to 1 , 2.0 to 1 , and 1 to 1.5 . Which number is crankshaft speed, and which is output shaft?

We run cummins 5.9 and 8.3s in large farm tractors under heavy tillage probly similar to boat usage . Change injectors every 5000 hrs . Engines good to about 12000 hrs. Then re ring and bottom end , good for 5 to 6000 more. Running 2200 rpms all day .

Possibly, pickup coil, electronic module, coil ,vapor lock.

Been looking for hull numbers.suppose to be under cover with four screws behind where toilet was? Or am I mixed up?

No mine doesn't have pocket , requires a full 34 to 36 inches draft. New mercruiser 383,1.52 velvet drive, 4 blade prop . Engine sits where fuel tank was , fuel tank moved to rear. New stringers, all custom driveline. Boat unrestored cosmetically , but tons of money spent on repower, wiring , autopi...

Hi all this is Lee from Florida. Been lurking here for a year or so. Finally bought a custom 25 sport convert. Total inboard 383 single velvet drive. Never had a Bertram and love it.