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 Post subject: SBC TO LS BASED
 Post Posted: Thu Aug 19, 2010 3:12 pm 
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Posts: 69
So,
i thought i would get some OF YOUR OPINONS on new build ;-)
this is my 1st ls build so im not sure what to expect

im looking to see what kind of potetial this thing has in terms of power and poss et?
last years combo
383 sb chevy gen 1 motor 4.030 bore 3.75 stroke-010 block
scat crank rods and kb forged flat top 11.4 compression
1/16 -1/16 in conventional standard tension ring pack
mildon race full kickout pan w tray
comp solid roller 259-264 at 050 630-615 lift after lash
afr 23 degree 227 eliminator
heads ootb 315-230cfm at 700
super vic w plenum work and matched to intake runner entry
1050 dominator 8896 all stock on top of 2 in hvh adaptor
1-7/8 headers into 3 in bullets
this motor went 10.50 on motor in denver and 9.30 on 175 shot

new combo is
4.030 bore 6.0 liter ls block studded mains ,heads
4.0 stroke callies crank callies h beam rods
wiseco dome piston 14.4 compression
043-043 low tension backut ring package
vacuum pump 12" or so for wet sump?
aftermarket pan with modified full lenght factory tray
55 mm cam core -255-263 at 050 650-660 lift hyd roller, but w solid roller comp enduro lifters -008" lash(i talked to chris at comp and he and i designed this cam that way to ahve better stabilty )
w 1.75 rocker ratio
13.5 degree ls based 245cc runner tfs heads - cnc ported by TEA -and gone over a little by hand
these flow 360-275CFM at 650" lift ,then commit suicide at over 700" lift or so lol
they flow 30 cfm or more better at every lift point from 300"inch up than my old heads
BOTH HEADS HAD 2.100 INT-1.600 EXH VALVES
heavily ported supervictor intake with alot of plenum and runner entry work
bigs billet `1000hp based carb on top of 1 in 4 hole super sucker, on top of 3/4" in nos plate
1-7/8 headers 3 in bullets
so what ya think its gonna make, and how much quicker does the car have the potentail to be?
thanks
ill try to get some pics of things up later tonight


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Thu Aug 19, 2010 9:24 pm 
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Location: k.c., mo.
im guessing 9.50@ 140


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Thu Aug 19, 2010 10:28 pm 
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I'll guess 9.90's. I'll bet the rpm range moves up about 1000 rpm from the other motor due to the much stronger low and mid lift flow in the heads. Should be interesting to see the results. I would think it should make over 700hp. I've thought about trying one of those LS engines for my next engine.

Why not use the Dominator from the 383? I'd want a Dominator on that engine.

Keep us posted.
Rick


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Fri Aug 20, 2010 11:30 am 
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Location: Colorado
rick360 wrote:
I'll guess 9.90's. I'll bet the rpm range moves up about 1000 rpm from the other motor due to the much stronger low and mid lift flow in the heads. Should be interesting to see the results. I would think it should make over 700hp. I've thought about trying one of those LS engines for my next engine.

Why not use the Dominator from the 383? I'd want a Dominator on that engine.

Keep us posted.
Rick


I would guess class rules on the carb, but that is a big assumption on my part..

Is your car ready Nick? I hope it is worth all the effort you were telling us it took to swap it over a couple months back..


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Fri Aug 20, 2010 2:54 pm 
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Thanks to those who replied
the reason the car now has a 4150 is because
a)the new intake setup sits so high ,there is no hood clearnace,so theres no way my old 2 in adaptor will work to go from 4150-4500 ,and the only dommi intake offered is not only higher than what i have but is 2000 bucks [-(
b)as was stated , i originally was moving to a new 4150 only class,but they have since added a 100 lb penalty on ls setups,which means id have to add close to 350pds to the car to be legal ,and thats not gonna happen
my 4150 i have now is being used on my buddys car and its been 9.60s on motor on a 565cui bb, so,im sure itll be close for me,although i agree it may like the 4500 better
maybe ill test that at a later date once its up and running to compare apples to apples sort to speak
well id anuyone else has any commenyt or constructive criticism let me know
thanks
nick
aka crossbreed


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Fri Aug 20, 2010 4:47 pm 
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Location: Colorado
Crossbreed wrote:
Thanks to those who replied
the reason the car now has a 4150 is because
a)the new intake setup sits so high ,there is no hood clearnace,so theres no way my old 2 in adaptor will work to go from 4150-4500 ,and the only dommi intake offered is not only higher than what i have but is 2000 bucks [-(
b)as was stated , i originally was moving to a new 4150 only class,but they have since added a 100 lb penalty on ls setups,which means id have to add close to 350pds to the car to be legal ,and thats not gonna happen
my 4150 i have now is being used on my buddys car and its been 9.60s on motor on a 565cui bb, so,im sure itll be close for me,although i agree it may like the 4500 better
maybe ill test that at a later date once its up and running to compare apples to apples sort to speak
well id anuyone else has any commenyt or constructive criticism let me know
thanks
nick
aka crossbreed

wilson makes a 1 inch tall adapter that is nice but 250 I think is how much I was told they cost..
That is crazy on the extra 100, have any LS based cars run that class yet?


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Sat Aug 21, 2010 10:00 am 
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Curtis has done some LS heads but other than him I don't know of anyone else on this board that has done anything with an LS engine. I guess you'll be the first then hey. If you keep this thread updated, etc, then we'll have some data for others that might want to give one a shot.

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 Post subject: Re: SBC TO LS BASED
 Post Posted: Sun Aug 22, 2010 5:43 pm 
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Crossbreed,

Who did your manifold work?

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 Post subject: Re: SBC TO LS BASED
 Post Posted: Mon Aug 23, 2010 9:59 pm 
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"Crossbreed,

Who did your manifold work?"

i did the work =; i basically had the shop who does my machining ,take and put in a brigdeport, and mill down into the plenum about an 1-1/2 deep, and opened up the plenum 9width all around )a little also ,then i radiused the dividers into the roof of the runners and blended all to a nice taper,mthen i matched the port opning to the head as deep as possible and worked on the corner radiui as well O:)
this helped add some plenum volume, but more importantly helped open up the center runners for what i hope to be better distribution as well [-(


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Tue Aug 24, 2010 11:44 am 
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Any pictures, curious to see what others are trying.

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Best 9.87@131 on the rev limitor 1 Feb 2013
1/8   6.15@110 NEW BEST 27 Nov 11
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 Post subject: Re: SBC TO LS BASED
 Post Posted: Fri Aug 19, 2011 2:15 pm 
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Well i little update on the new motor
Its been a long time coming but i finally got the car out again
I made 3 passes last weekend
Density alt was between 9300-9700 ft during the day so there were no records to be set at Bandimere that day =P~
Best pass with the new combo was 10.20 at 132
I think it wants more converter as well as to leave higher off the 2 step

I think with some work on the 60 ft and some better air towards fall itll go 9.90s as it sits
I cant really complain for only having 3 passes on the new combo
But of course as a racer i cant leave anything alone sooooooooooooo...............
Next time out the intake will have some more work (as the runners are Bone Stock -not even a port match -just light plrnum work) heads are 60 cfm up on best intake runner as it sits
As well as there will be the new larger exhaust i have for it -never installed
due to time constraints and fitment issues i was forced to run my smaller exhaust
Also i may try a dominator at some point as i think it will like it as well
I would hope itll go 9.80s when sorted out
This would put it at very low nines at a sea level track,which is where this motor should be
Once its sorted out on motor,itll be time to spray it and see where it goes from there
We'll see i suppose


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Fri Aug 19, 2011 2:37 pm 
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Man, you had to dig back a few pages to find this one. It's almost been a year since the last post here.

But hey, glad to see you're back to smelling smoke! And as far as the changes go, that's what this hobby is all about, ie, even if it's not broke, you can usually still fix it!

And I bitched last week because the air was at 1700 ft? O:)

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Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

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 Post subject: Re: SBC TO LS BASED
 Post Posted: Fri Aug 19, 2011 4:47 pm 
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HELL,Id kill for 1700 ft of air buddy =;
Im hoping the changes go according to plan
The intake is where im hopingh some gains are found as i was hoping to have more work done to the intake back when i built it but it never transpired so besides some plenum work it want touched anywhere else
Being a symmetrical port intake,it naturally has long outer and short inner runners
Well this intake has that but none of them are the same crosssection
It seems they were trying to tune this thing for the different lenght runners by changing the cross section ,and so they are all over the place in terms of size
Also there is no taper at all between the head intake ports and intake manifold runners
Man ,you gottas love this stuff ;-)


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Tue Sep 13, 2011 10:38 pm 
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Well i took it out last Sunday
Air was 8400 feet of Density Altitude
Car ran best of 10.08 at 133 w only a 1.42 60 ft
Gonna try a dominator and some minor chassis tuning along with air should be getting better in the next few weeks
9"s are soo close it driving me nuts


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 Post subject: Re: SBC TO LS BASED
 Post Posted: Wed Sep 14, 2011 2:19 am 
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Glad to see you're sneaking up on it. Some pictures of this stuff would be nice since most of us here have very little experience with this engine.

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Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

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