New Drivetrain: need help deciding on engine 950hp BBC vs 700sci
08-12-2016, 03:07 PM
#11
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As mentioned we have one brand new, never fired HP700sci in stock with exhaust. I am asking $39950, Merc retail is 60k plus. Will entertain offers. Its blue in color. Full Warranties.
[email protected]
[email protected]
08-12-2016, 04:33 PM
#13
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I'm eager to see how this setup works with the arneson. Are you going to run a cleaver or bravo style prop?
Contrary to my usual opinion, I'd say go with the 700sci. Easy to make into 900+ down the road. I'm usually all for aftermarket custom built motors (more so against merc racings prices) but a big NA motor with a solid roller cam presents its own issues. You'll be setting valve lash often which requires taking the headers off (unless you get 2 piece valve covers) so that's quite a job. Also, to make a big inch NA motor you can have water reversion issues from the cam, the pistons are weaker from the wrist pin being so high etc etc. those motors work well in cars where the load on them is significantly less, but a 30' heavy single engine boat is about the harshest environment you can put a motor in.
Contrary to my usual opinion, I'd say go with the 700sci. Easy to make into 900+ down the road. I'm usually all for aftermarket custom built motors (more so against merc racings prices) but a big NA motor with a solid roller cam presents its own issues. You'll be setting valve lash often which requires taking the headers off (unless you get 2 piece valve covers) so that's quite a job. Also, to make a big inch NA motor you can have water reversion issues from the cam, the pistons are weaker from the wrist pin being so high etc etc. those motors work well in cars where the load on them is significantly less, but a 30' heavy single engine boat is about the harshest environment you can put a motor in.
08-12-2016, 04:58 PM
#14
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iTrader: (1)
Any feedback in I/O boats ? A Chevelle or etc is a whole 'nother boat...pun intended.
08-12-2016, 06:25 PM
#15
Registered
Car guys rarely get marine stuff right the first time. Especially I/O's.
We're on pins and needles wondering what Bups new guy is going to deliver on that project.
I got unlucky a few times having car guys build boat engines for me. They were all smart good builders - with little to no marine experience.
VERY cool project Im eager to see it unfold - congratulations Turbo Raven!
UD
Last edited by Uncle Dave; 08-12-2016 at 06:28 PM.
08-12-2016, 06:37 PM
#16
VIP Member
VIP Member
Some random thoughts, worth exactly what you pay for them, and your mileage may vary.
I think the IDEA of dry (loud) exhaust is probably better than actually having dry exhaust, especially in a boat doing double duty as a family boat. Forget communication in the cockpit if the engine is running and I hope the area where you boat is a lot more lenient on noise than where we boat.
The Merc is undoubtedly going to be better for resale but I don't necessarily believe it's a given that it will be more reliable than some of the custom builders. I've lived on a lake all my life and have had my share of service headaches with stock power. Even wimpy stock power.
If you're going to do custom power, I'd stick with a "name" IE Boostpower, Teague, Pfaff, Carson, etc. Someone who specializes in marine applications, not the local drag race or toilet bowl racer hot rod shop.
We have a 600 CID / 900 HP BoostPower package and it's never so much a coughed wrong. It starts every time, idles, and pulls like a freight train. When I've had questions I can make a phone call and get Alexi on the phone. Try that with your Merc. It's also a much "cooler" package and if we're being honest, the cool factor is a huge part of performance boating. Nobody "needs" a performance boat. We want one. The custom engines are finished off so much nicer it isn't even funny.
Remember if you're dealing with a custom builder, it probably has to go back to them for service, and you can make a dyno show some really impressive numbers without it being realistic useable HP. See my comments about a reputable shop who specializes in marine power.
At the end of the day it's about what you want & can afford, and makes you and the family feel good at the lake. Or the show & shine. Or wherever.
Between the choices you've floated out there, I'd probably go with the Merc for all the convenience reasons.
Throw (for me) BoostPower into the mix and that would be my choice because I've dealt with them.
Good luck & whichever way you go post lots of pics and have fun.
Cheers
I think the IDEA of dry (loud) exhaust is probably better than actually having dry exhaust, especially in a boat doing double duty as a family boat. Forget communication in the cockpit if the engine is running and I hope the area where you boat is a lot more lenient on noise than where we boat.
The Merc is undoubtedly going to be better for resale but I don't necessarily believe it's a given that it will be more reliable than some of the custom builders. I've lived on a lake all my life and have had my share of service headaches with stock power. Even wimpy stock power.
If you're going to do custom power, I'd stick with a "name" IE Boostpower, Teague, Pfaff, Carson, etc. Someone who specializes in marine applications, not the local drag race or toilet bowl racer hot rod shop.
We have a 600 CID / 900 HP BoostPower package and it's never so much a coughed wrong. It starts every time, idles, and pulls like a freight train. When I've had questions I can make a phone call and get Alexi on the phone. Try that with your Merc. It's also a much "cooler" package and if we're being honest, the cool factor is a huge part of performance boating. Nobody "needs" a performance boat. We want one. The custom engines are finished off so much nicer it isn't even funny.
Remember if you're dealing with a custom builder, it probably has to go back to them for service, and you can make a dyno show some really impressive numbers without it being realistic useable HP. See my comments about a reputable shop who specializes in marine power.
At the end of the day it's about what you want & can afford, and makes you and the family feel good at the lake. Or the show & shine. Or wherever.
Between the choices you've floated out there, I'd probably go with the Merc for all the convenience reasons.
Throw (for me) BoostPower into the mix and that would be my choice because I've dealt with them.
Good luck & whichever way you go post lots of pics and have fun.
Cheers
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There are 2 types of people in this world:
1. Those who can extrapolate from incomplete data.
There are 2 types of people in this world:
1. Those who can extrapolate from incomplete data.
08-12-2016, 11:14 PM
#18
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As mentioned we have one brand new, never fired HP700sci in stock with exhaust. I am asking $39950, Merc retail is 60k plus. Will entertain offers. Its blue in color. Full Warranties.
[email protected]
[email protected]
I'm eager to see how this setup works with the arneson. Are you going to run a cleaver or bravo style prop?
Contrary to my usual opinion, I'd say go with the 700sci. Easy to make into 900+ down the road. I'm usually all for aftermarket custom built motors (more so against merc racings prices) but a big NA motor with a solid roller cam presents its own issues. You'll be setting valve lash often which requires taking the headers off (unless you get 2 piece valve covers) so that's quite a job. Also, to make a big inch NA motor you can have water reversion issues from the cam, the pistons are weaker from the wrist pin being so high etc etc. those motors work well in cars where the load on them is significantly less, but a 30' heavy single engine boat is about the harshest environment you can put a motor in.
Contrary to my usual opinion, I'd say go with the 700sci. Easy to make into 900+ down the road. I'm usually all for aftermarket custom built motors (more so against merc racings prices) but a big NA motor with a solid roller cam presents its own issues. You'll be setting valve lash often which requires taking the headers off (unless you get 2 piece valve covers) so that's quite a job. Also, to make a big inch NA motor you can have water reversion issues from the cam, the pistons are weaker from the wrist pin being so high etc etc. those motors work well in cars where the load on them is significantly less, but a 30' heavy single engine boat is about the harshest environment you can put a motor in.
YUP.
Car guys rarely get marine stuff right the first time. Especially I/O's.
We're on pins and needles wondering what Bups new guy is going to deliver on that project.
I got unlucky a few times having car guys build boat engines for me. They were all smart good builders - with little to no marine experience.
VERY cool project Im eager to see it unfold - congratulations Turbo Raven!
UD
Car guys rarely get marine stuff right the first time. Especially I/O's.
We're on pins and needles wondering what Bups new guy is going to deliver on that project.
I got unlucky a few times having car guys build boat engines for me. They were all smart good builders - with little to no marine experience.
VERY cool project Im eager to see it unfold - congratulations Turbo Raven!
UD
Some random thoughts, worth exactly what you pay for them, and your mileage may vary.
I think the IDEA of dry (loud) exhaust is probably better than actually having dry exhaust, especially in a boat doing double duty as a family boat. Forget communication in the cockpit if the engine is running and I hope the area where you boat is a lot more lenient on noise than where we boat.
The Merc is undoubtedly going to be better for resale but I don't necessarily believe it's a given that it will be more reliable than some of the custom builders. I've lived on a lake all my life and have had my share of service headaches with stock power. Even wimpy stock power.
If you're going to do custom power, I'd stick with a "name" IE Boostpower, Teague, Pfaff, Carson, etc. Someone who specializes in marine applications, not the local drag race or toilet bowl racer hot rod shop.
We have a 600 CID / 900 HP BoostPower package and it's never so much a coughed wrong. It starts every time, idles, and pulls like a freight train. When I've had questions I can make a phone call and get Alexi on the phone. Try that with your Merc. It's also a much "cooler" package and if we're being honest, the cool factor is a huge part of performance boating. Nobody "needs" a performance boat. We want one. The custom engines are finished off so much nicer it isn't even funny.
Remember if you're dealing with a custom builder, it probably has to go back to them for service, and you can make a dyno show some really impressive numbers without it being realistic useable HP. See my comments about a reputable shop who specializes in marine power.
At the end of the day it's about what you want & can afford, and makes you and the family feel good at the lake. Or the show & shine. Or wherever.
Between the choices you've floated out there, I'd probably go with the Merc for all the convenience reasons.
Throw (for me) BoostPower into the mix and that would be my choice because I've dealt with them.
Good luck & whichever way you go post lots of pics and have fun.
Cheers
I think the IDEA of dry (loud) exhaust is probably better than actually having dry exhaust, especially in a boat doing double duty as a family boat. Forget communication in the cockpit if the engine is running and I hope the area where you boat is a lot more lenient on noise than where we boat.
The Merc is undoubtedly going to be better for resale but I don't necessarily believe it's a given that it will be more reliable than some of the custom builders. I've lived on a lake all my life and have had my share of service headaches with stock power. Even wimpy stock power.
If you're going to do custom power, I'd stick with a "name" IE Boostpower, Teague, Pfaff, Carson, etc. Someone who specializes in marine applications, not the local drag race or toilet bowl racer hot rod shop.
We have a 600 CID / 900 HP BoostPower package and it's never so much a coughed wrong. It starts every time, idles, and pulls like a freight train. When I've had questions I can make a phone call and get Alexi on the phone. Try that with your Merc. It's also a much "cooler" package and if we're being honest, the cool factor is a huge part of performance boating. Nobody "needs" a performance boat. We want one. The custom engines are finished off so much nicer it isn't even funny.
Remember if you're dealing with a custom builder, it probably has to go back to them for service, and you can make a dyno show some really impressive numbers without it being realistic useable HP. See my comments about a reputable shop who specializes in marine power.
At the end of the day it's about what you want & can afford, and makes you and the family feel good at the lake. Or the show & shine. Or wherever.
Between the choices you've floated out there, I'd probably go with the Merc for all the convenience reasons.
Throw (for me) BoostPower into the mix and that would be my choice because I've dealt with them.
Good luck & whichever way you go post lots of pics and have fun.
Cheers
08-13-2016, 08:53 AM
#19
Registered
If you're in Hawaii and using it in saltwater all the time is another plus for the 700 with closed cooling. still needs to be flushed good after each use but you won't have to worry about the heads rotting away.
