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Old June 8th, 2013, 07:11 PM   #1
turbosb2
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Default 427 ls build

alright guys im getting ready to pull the trigger on the 427 ls build with stage 3 ls3 cnc heads and 100 shot of spray. the motor will be around 10.75 to 1 all forged rotating assm. thinking around 620 lift ish on the cam shaft as i need to research the 4x4 offroad world scorpion 1.8 rockers maybe a F.A.S.T intake .have the trans gone through by jollys . do a twin electric fan set up .i guess i have a couple of questions has anybody on here built something simular and what converter did you use and what issues should i look out for ...rear diff and front.
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Old June 8th, 2013, 08:54 PM   #2
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You probably wont need the rockers if you put the right cam in it. They would be useful if you were to run a factory style/size cam.


LS1tech.com would be a good place to do some asking and reading.



Sounds like it could be a badass setup, just make sure you have a reputable builder look over your shopping list before you start buying parts.
They can save you alot of money and headache from their experience.
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Old June 9th, 2013, 07:53 AM   #3
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whats this going into?
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Old June 9th, 2013, 08:09 AM   #4
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I could sell one of my gold chains and pay for this motor
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Old June 9th, 2013, 01:50 PM   #5
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WWW.flowtechinduction.com

Ed Curtis would be the guy to get a valvetrain package from that works.
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Old June 9th, 2013, 07:51 PM   #6
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Not sure what it's going in, or what the plans are for it, but your best bet is to call a converter company and have one built for it.
Sounds like you're building something to have some power, so I wouldn't want to waste it with an off the shelf unit.
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Old June 9th, 2013, 08:40 PM   #7
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Quote:
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whats this going into?
2009 sierra hd
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Old June 10th, 2013, 12:16 PM   #8
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Quote:
Originally Posted by turbosb2 View Post
2009 sierra hd
Weight?
axle ratios?
Tire size?
goals for the truck?
Duration of cam?

Those are the things you design your converter around.

I don't see where you need the 1.8 rockers with the big cam.

I haven't seen ANY LSx engine builds on this site, but there are plenty of similar builds on LS1tech.com, which is the place you should probably start with your research.

You might also check to see how much time/work/cost its going to be, over buying an LSX454 bottom end.

If you are going with the LS3 style heads, I would look into AI for the head porting. I am considering them for porting my LS2 (799) heads, as they have a great reputation for the cathedral ports. I would be considering aftermarket heads for that motor, though.

What block/bore are you using?
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Old June 10th, 2013, 12:34 PM   #9
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Here's a link to what Coan likes to know when building a custom converter.
http://www.coanracing.com/CustomerCa...sp?Action=FORM
It will cost more than an off the shelf, but it's well worth it.
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Old June 10th, 2013, 12:42 PM   #10
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Quote:
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Here's a link to what Coan likes to know when building a custom converter.
http://www.coanracing.com/CustomerCa...sp?Action=FORM
It will cost more than an off the shelf, but it's well worth it.

X2 on Coan they make great converters over there. if u go with them talk to craig 765 456 3957. he always sets me up with what I need and works for Coan.
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Old June 10th, 2013, 12:48 PM   #11
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Lenny @ Ultimate Converter Concepts also is one of if not the best covnerter guy. Great srevice and support.

http://www.ultimateconverter.com/
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Old June 10th, 2013, 03:25 PM   #12
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COAN r poo in my opinion. .went thru 2 of them in 2 weeks, broke drive hub welds..
3200+stahl.
Had an acc converter for 3 years. .no issues yet :)
Just my experience though. .

sended frum dis stoopid fone.
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Old June 10th, 2013, 04:32 PM   #13
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Quote:
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COAN r poo in my opinion. .went thru 2 of them in 2 weeks, broke drive hub welds..
3200+stahl.
Had an acc converter for 3 years. .no issues yet :)
Just my experience though. .

sended frum dis stoopid fone.
Interesting. Did they help in any way? Dad and I combined have probably ran a dozen of their units over the years, ranging from 3,000-6,400 and never had an issues behind some decent power.
I'm curious how they handled that situation.
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Old June 10th, 2013, 07:21 PM   #14
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They gave me my $$$ back and also gave me a chromoly input drum assy...
Their customer service was great, it was actually an engineer from coan that recommended a ACC converter.

I see 100s of them hold up excellent, just figured id throw my experience in there.

Id try a COAN again, simply because their customer service was excellent, and I see tons of coans hold up every day.


sended frum dis stoopid fone.
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Old June 11th, 2013, 07:03 AM   #15
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Nice to see they at least tried to help, but too bad they couldn't get it right.
Good to see you've got something that's working for you too!
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Old June 11th, 2013, 10:43 AM   #16
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Quote:
Originally Posted by big86inthestixx View Post
COAN r poo in my opinion. .went thru 2 of them in 2 weeks, broke drive hub welds..
3200+stahl.
Had an acc converter for 3 years. .no issues yet :)
Just my experience though. .

sended frum dis stoopid fone.
I agree with this, Had bad luck with them on 2 different transmissions. Had a th400 take out 3 gear on the first pass, Bought a powerglide form them and cooked the band in 3 passes. Both times they did send parts to repair, But R&Ring the trans sucks. I had one of there convertors on my 86 chevy that I kept blowing through the convertor on launch. Sent it back 3 times in a 2 month period. I switched to transmission specatiles and have not had a problem since
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