Ls1 upgrade questions
09-07-2012, 08:11 PM
#31
I build a ls 2 into marine version ,got a new l 76 truck engine from the newer trucks which is a ls2 block whit ls 3 heads on it and a high truck intake ,making 360 hp
We stroked that whit a compstar kit to 408 and upgraded the valve train ,timing gear and put in a bigger cam and a ls2 intake to get it fit under the engine hatch and maked it dry sump whit ls 7 oil sytem ,cooling sytem I used from pcm .
The headers I dyno whit where cmi s but there high and didn t like the collector so switched to a set lightning .
It make s 560 hp @6100 rpm and max tq is 550 ft lbs @4700
and tq is real flat from 3000 -6300 rpm above 500 ft/lbs
know have 20 hrs of use and like it every time if I go out ,this engine push real good and screams for more !
here are some video s !
http://www.youtube.com/user/phantomlspower?feature=mhee
enjoy .so far 96 mph but still testing props and spacers .
We stroked that whit a compstar kit to 408 and upgraded the valve train ,timing gear and put in a bigger cam and a ls2 intake to get it fit under the engine hatch and maked it dry sump whit ls 7 oil sytem ,cooling sytem I used from pcm .
The headers I dyno whit where cmi s but there high and didn t like the collector so switched to a set lightning .
It make s 560 hp @6100 rpm and max tq is 550 ft lbs @4700
and tq is real flat from 3000 -6300 rpm above 500 ft/lbs
know have 20 hrs of use and like it every time if I go out ,this engine push real good and screams for more !
here are some video s !
http://www.youtube.com/user/phantomlspower?feature=mhee
enjoy .so far 96 mph but still testing props and spacers .
09-08-2012, 03:03 AM
#33
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Noobie first post 
Cool thread! Ive spent the past 6 years modding and beating on LSX based engines in my race car, they are amazing! Im surprised I havent seen more of these engines in high performance boats, they are light years ahead of the old gen I & II designs.
The ls3 "top end" is an upgrade to the cathedral port heads anytime your running a 4" or larger bore. The rectangular ports flow alot better and are cheap considering the price of a set of aftermarket cathedral port heads. The only drawback is the 2.165 inch intake valve and 15 degree valve angle can limit your cam choices due to clearence issues.
Cool thread! Ive spent the past 6 years modding and beating on LSX based engines in my race car, they are amazing! Im surprised I havent seen more of these engines in high performance boats, they are light years ahead of the old gen I & II designs. The ls3 "top end" is an upgrade to the cathedral port heads anytime your running a 4" or larger bore. The rectangular ports flow alot better and are cheap considering the price of a set of aftermarket cathedral port heads. The only drawback is the 2.165 inch intake valve and 15 degree valve angle can limit your cam choices due to clearence issues.
09-08-2012, 10:26 AM
#34
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Noobie first post Cool thread! Ive spent the past 6 years modding and beating on LSX based engines in my race car, they are amazing! Im surprised I havent seen more of these engines in high performance boats, they are light years ahead of the old gen I & II designs.
The ls3 "top end" is an upgrade to the cathedral port heads anytime your running a 4" or larger bore. The rectangular ports flow alot better and are cheap considering the price of a set of aftermarket cathedral port heads. The only drawback is the 2.165 inch intake valve and 15 degree valve angle can limit your cam choices due to clearence issues.
Cool thread! Ive spent the past 6 years modding and beating on LSX based engines in my race car, they are amazing! Im surprised I havent seen more of these engines in high performance boats, they are light years ahead of the old gen I & II designs. The ls3 "top end" is an upgrade to the cathedral port heads anytime your running a 4" or larger bore. The rectangular ports flow alot better and are cheap considering the price of a set of aftermarket cathedral port heads. The only drawback is the 2.165 inch intake valve and 15 degree valve angle can limit your cam choices due to clearence issues.
5.0mag becomes 4.8l ls, 350 mag becomes 5.3l ls, 377 mag becomes 6.0l ls, 8.2l becomes 6.6l ls (408) different cams get you your h.o. version. 525 efi 6.6l with ls3 heads and mild cam. add a tvs1900 blower for you 600+ motor and tvs2300 for you 700 motor. these could be iron or aluminum based all the blocks are available. the price for ls stuff goes way up if you plan on an engine larger than 418, you have to have a stroke deeper than 4in which I don't like on most production blocks. Aftermarket and ls7 push the price way up and in most cases are not needed.
09-08-2012, 10:47 AM
#35
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A thread I started last year to discuss this topic. Some interesting discussion.
http://www.offshoreonly.com/forums/g...rs-hiding.html
http://www.offshoreonly.com/forums/g...rs-hiding.html
09-08-2012, 12:05 PM
#37
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thx guys !
It s real fun to drive and very easy hardly any chine walk up to 96 mph and what there is you steer easily out it whit the dual ram steering .
that nasty engine even get the boat to 90 mph @5000 rpm whit my big 32 maximus on it !
my next project will be a 26-28 cat whit 2 ls in the back making 550-600 hp probaly a little bigger diplacement that way I can use normal bravo xr and everything keeps in one piece and still go fast !
and not to forget pretty light weight !
It s real fun to drive and very easy hardly any chine walk up to 96 mph and what there is you steer easily out it whit the dual ram steering .
that nasty engine even get the boat to 90 mph @5000 rpm whit my big 32 maximus on it !
my next project will be a 26-28 cat whit 2 ls in the back making 550-600 hp probaly a little bigger diplacement that way I can use normal bravo xr and everything keeps in one piece and still go fast !
and not to forget pretty light weight !
09-11-2012, 04:36 PM
#38
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This will solve your problem if you want to drop the $$$
http://www.mastmotorsports.com/2010/news-view.php?id=74
Talk to Scott. He used to work for Ilmor for quite some time. He left Ilmor and went to Mast Motorsports. He was a major part in the development of this engine. Nice guy.
http://www.mastmotorsports.com/2010/news-view.php?id=74
Talk to Scott. He used to work for Ilmor for quite some time. He left Ilmor and went to Mast Motorsports. He was a major part in the development of this engine. Nice guy.
09-11-2012, 08:30 PM
#39
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This will solve your problem if you want to drop the $$$
http://www.mastmotorsports.com/2010/news-view.php?id=74
Talk to Scott. He used to work for Ilmor for quite some time. He left Ilmor and went to Mast Motorsports. He was a major part in the development of this engine. Nice guy.
http://www.mastmotorsports.com/2010/news-view.php?id=74
Talk to Scott. He used to work for Ilmor for quite some time. He left Ilmor and went to Mast Motorsports. He was a major part in the development of this engine. Nice guy.
but for the most part the mast engine is not what this guy is looking for. Its not even where the ls will do best in the marine market especially with what people are going to spend these days. for the same money teague, croket,GT etc will eat mast's lunch. The ls stuff shines when you want to make up to about 600hp cause it can be done cheap.(production block and heads etc) add in a set of 3k+ mast heads and aftermarket block and that evaporates. I can't figure out why no one is making 450hp to 600hp ls engines using mostly gm parts. once you go past a 408cid the price goes way up for little gain.
trying to go toe to toe with a bbc is foolish imo. I would not pay the same price for a small block, when I could get a BBC make more power and torque for less money.
09-12-2012, 07:48 AM
#40
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thx guys !
It s real fun to drive and very easy hardly any chine walk up to 96 mph and what there is you steer easily out it whit the dual ram steering .
that nasty engine even get the boat to 90 mph @5000 rpm whit my big 32 maximus on it !
my next project will be a 26-28 cat whit 2 ls in the back making 550-600 hp probaly a little bigger diplacement that way I can use normal bravo xr and everything keeps in one piece and still go fast !
and not to forget pretty light weight !
It s real fun to drive and very easy hardly any chine walk up to 96 mph and what there is you steer easily out it whit the dual ram steering .
that nasty engine even get the boat to 90 mph @5000 rpm whit my big 32 maximus on it !
my next project will be a 26-28 cat whit 2 ls in the back making 550-600 hp probaly a little bigger diplacement that way I can use normal bravo xr and everything keeps in one piece and still go fast !
and not to forget pretty light weight !
