building a 460BBF

[andrewszalontai]

Your expertise welcome here for my boat engine 460 BBF build...

I have a 429/460 BBF and want to rebuild it in the coming year. It sits in a 20' Spectra jet boat, with a few SCJ parts: intake, and rods. DOVE-C heads, a light marine cam and roller rockers with a 730 vac Holly, stock aluminum exhaust logs.

I do 58mph on my boat with 4500rpm on a AA cast impeller. I would like to make the 70+mph mark.

I was hoping to stoke this motor to 512-521 in hopes of more HP and Torque. My boat is quite heavy 3000+lbs.

Should I just get great flowing heads and headers? What about the Cam size/duration? I would use a hydrolic roller assembly rather than a mechanical one for less maintenance.

Should I just order a crate motor from Ford for $9k? Or are there some other benefits of piecing everything together myself? Less headaches with the crate motor, but there is the potential to have a better engine for the same price...

[Yellowboat]

you need to get in contact with lakes only.

[Gelcoater]

Your expertise welcome here for my boat engine 460 BBF build...

I have a 429/460 BBF and want to rebuild it in the coming year. It sits in a 20' Spectra jet boat, with a few SCJ parts: intake, and rods. DOVE-C heads, a light marine cam and roller rockers with a 730 vac Holly, stock aluminum exhaust logs.

I do 58mph on my boat with 4500rpm on a AA cast impeller. I would like to make the 70+mph mark.

I was hoping to stoke this motor to 512-521 in hopes of more HP and Torque. My boat is quite heavy 3000+lbs.

Should I just get great flowing heads and headers? What about the Cam size/duration? I would use a hydrolic roller assembly rather than a mechanical one for less maintenance.

Should I just order a crate motor from Ford for $9k? Or are there some other benefits of piecing everything together myself? Less headaches with the crate motor, but there is the potential to have a better engine for the same price...Im thinking a Ford crate engine{read car engine} is not the answer here.Im no engine guru but i believe piston to wall clearance,rod and main bearing clearances are different in a boat engine. As you know the jet boat runs a much higher rpm for a long duration compaired to a car. as far as a cam selection be carefull here as well,the wrong duration #s in an engine running wet exaust can lead to reversion issues where the engine sucks water back in through the exaust.And on the subject of exaust,i think those logs may be a cork in your build.
If i were you i would contact one of the engine guys here and get some advice from a pro.

[alelogman]

That was very modest of you but you already seem to be an used engines (http://www.mwdauto.com/) expert because that's what I head from someone who knows well about motors.

[randyjet]

Have a brand new never run 521 stroker fully assembled and ready to go it has all the goodies eagle crank, eagle rods, JSE pistons SCJ heads ported roller rockers all the oiling system cleaned up balanced and blueprinted with 10 quart pan never ever started sitting on the stand. $5500.00
Randy 8323922110

[rivermobster]

Have a brand new never run 521 stroker fully assembled and ready to go it has all the goodies eagle crank, eagle rods, JSE pistons SCJ heads ported roller rockers all the oiling system cleaned up balanced and blueprinted with 10 quart pan never ever started sitting on the stand. $5500.00
Randy 8323922110

this should easily do what you want!