Twin aluminum Small Blocks good idea, or a bad idea?
#31
This guy looks like he's got a pretty nice setup:
http://texasboatforums.com/viewtopic...=200&hilit=ls3
http://texasboatforums.com/viewtopic...=200&hilit=ls3
#33
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Join Date: Jul 2015
Location: Mississauga, Ontario, Canada
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I was searching for some weight numbers,,
The 350 mag SB from mercury with iron block, heads, and Exhaust
on Mercury's website is i am guessing fully dressed at 885 lbs
From what i can find.. the LS3 SB
Aluminum block, Heads, composite intake, cast iron exhaust manifold..
set up for a car. weights in at 403 lbs..
to Dress this up for a marine engine.. and I would use a sport tube header... guessing to add 150 lbs
that's a 330 lbs saving on weight times 2 engines.. that is good.
However, on the Bam speed calculator ( given HP of the motor is not changed) it shows up as a 3 mph increase..
The 350 mag SB from mercury with iron block, heads, and Exhaust
on Mercury's website is i am guessing fully dressed at 885 lbs
From what i can find.. the LS3 SB
Aluminum block, Heads, composite intake, cast iron exhaust manifold..
set up for a car. weights in at 403 lbs..
to Dress this up for a marine engine.. and I would use a sport tube header... guessing to add 150 lbs
that's a 330 lbs saving on weight times 2 engines.. that is good.
However, on the Bam speed calculator ( given HP of the motor is not changed) it shows up as a 3 mph increase..
#36
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http://www.lsxtv.com/tech-stories/en...e-engine-dyno/. Just take a look at some LS3 testing.
Baseline and also a few cam
Options. These motors make plenty of torque down low. Just a factory LS3 461hp@5900 and 455@4800 tq. Down at 3000 rpm 378 tq already. This is stock.... First mild cam swap 500hp at 5900 488tq at 4800. And a very broad curve at that, no "dyno queen" spikes. Very useable broad power. Mix in a head swap with cam and a useable 600hp isn't a far stretch at all. All NA. I love these LS's..... Data don't lie
Baseline and also a few cam
Options. These motors make plenty of torque down low. Just a factory LS3 461hp@5900 and 455@4800 tq. Down at 3000 rpm 378 tq already. This is stock.... First mild cam swap 500hp at 5900 488tq at 4800. And a very broad curve at that, no "dyno queen" spikes. Very useable broad power. Mix in a head swap with cam and a useable 600hp isn't a far stretch at all. All NA. I love these LS's..... Data don't lie
#38
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iTrader: (3)
http://www.lsxtv.com/tech-stories/en...e-engine-dyno/. Just take a look at some LS3 testing.
Baseline and also a few cam
Options. These motors make plenty of torque down low. Just a factory LS3 461hp@5900 and 455@4800 tq. Down at 3000 rpm 378 tq already. This is stock.... First mild cam swap 500hp at 5900 488tq at 4800. And a very broad curve at that, no "dyno queen" spikes. Very useable broad power. Mix in a head swap with cam and a useable 600hp isn't a far stretch at all. All NA. I love these LS's..... Data don't lie
Baseline and also a few cam
Options. These motors make plenty of torque down low. Just a factory LS3 461hp@5900 and 455@4800 tq. Down at 3000 rpm 378 tq already. This is stock.... First mild cam swap 500hp at 5900 488tq at 4800. And a very broad curve at that, no "dyno queen" spikes. Very useable broad power. Mix in a head swap with cam and a useable 600hp isn't a far stretch at all. All NA. I love these LS's..... Data don't lie
http://www.airflowresearch.com/engin...-265cc-bbc.php
#39
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Right.... Strong little "under dog". Throw on a set of AFR's and a shelf cam on the LS.... Now we're well in built 496/502 territory no question for not much money... And lighter to boot.
#40
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iTrader: (2)
If it was me i would pull some weight off the back of the boat like a previous poster suggested and see how the boat responds. Free and conclusive. On a light layup 2500-3000 lb single stern drive its not nessesary.but for this guy it does make sense it could put more wetted surface into play. Have to see a na ls dyno 100 over say a scorpion vortec based sbc on same dyno same exhaust in person to believe it myself .great motor but put wet cast on a 6.0 vett witb a auto and it may run high 14's