Thread: Planning to build a Marine 383 Stroker

Tweet

Originally Posted by inspectorlance

The 15" pitch prop is way too small. I am running a very simular boat 25 bayliner about 7k pounds with a tired 307 with only 200 hp, and a 17" pitch prop. top speed with the bottom clean is 32 mph. I am building a 383 for the boat and plan on running a 23 pitch. By my calculation I should be running 48 mph with the new motor and prop. Im sure your wondering where I will get a 23 pitch prop?? ya can buy a 21 and have it modded at any good prop shop.
There is definatly something limiting your rpm, but that really doesnt matter since you shoudnt be running in that range anyways. I've got half your hp with my 307, and a bigger prop, and am running a simular speed, that should convince you to get a bigger prop.
Lance

yes you are right .the 383 should get it up on plane so a bigger prop will not hurt we reprop a 22 sea-ray454 and did get so much more top end that the speed-o pickup stop working and started to chime walk bad .we pass a 39 stinger and not much of anything was in the water but the prop. when we went by them. that is what they told me