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Old October 22nd, 2012, 05:05 AM   #1
knaffie
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Default mild LS1 build advice?

My rig (Ultra 4 buggy now used only for recreational use) has a 2002 LS1, currently stock except a LS6 intake and Jim's tune. I'd like to add a little power to it soon and need some advice. I have no specific goal for HP or budget, but I do want to make sure I buy the right stuff the first time.

I'm hoping heads and a cam should (hopefully) be all I need, but I have no idea which ones I need or (honestly) what all those numbers that define them mean. I have a friend that is going to do the mechanical work for me. I need some help picking out the right parts.

I want a combination that makes good low-end power, not high RPM power. I keep hearing Texas speed makes great budget heads and cam. Anybody else I should be talking to?

Other questions......
Will I need larger (than stock) injectors?
Will a single Bosch 044 fuel pump supply enough to keep up?
If I leave the stock manifolds on (I really would prefer to), are they going to seriously choke the engine off?
Would porting / polishing the manifolds be polishing a turd?
Is a build engine going to make more heat, requiring me to upgrade the cooling system?

Anything else I should be thinking about doing while everything is out / apart? Any parts I am missing? Any issues I'm going to run into that I won't expect?

Any advice is appreciated.
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Old October 22nd, 2012, 07:53 PM   #2
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If you upgrade the cam you're going to want one with a wide lobe separation angle such as 112 or higher for good idle quality and lower rpm power. More lift will help it breathe but you don't wanna go too much bigger on the duration. As for cylinder heads, i don't see much need for spending 2K on a pair of heads when you can have yours ported for less and they will do the same thing. Just make sure you upgrade the springs if you upgrade the cam. As for fuel delivery you have to find out the GPH your pump is capable of. i think your pump will be fine as long as you're not going over 450 HP.
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Old October 22nd, 2012, 08:00 PM   #3
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I talked to Kevin at Pacific Fabrication today about this. I heard they were making an "Ultra 4" cam that a lot of people like. He said with their custom cam, valve springs, pushrods, and whatever else (he will supply everything I need), I should be at around 400HP. If I add heads to that, its $2500 more for an additional 50HP. He also talked about usable horsepower versus big horsepower numbers on the dyno. I'm pretty sure he just talked me out of the heads. He also said although my stock fuel injectors will be maxed out, they should be fine.
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Old October 22nd, 2012, 08:04 PM   #4
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If injectors become your limiting factor you can always upgrade to LS2 injectors which flow 25% more. stock LS1 injectors are around 26lb-hr where LS2's are about a 33lb-hr
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Old October 22nd, 2012, 08:08 PM   #5
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if you could find some 02-04 LS6 heads for a decent price those would be worth putting on over the stock LS1 heads. they flow more cfm at the same lift then the LS1's
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Old October 22nd, 2012, 08:13 PM   #6
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Good to know - thanks.

I guess I just need to figure out how far I wan to take thing thing. I have a feeling if I do the heads to, its going to get ridiculously expensive really quick....

stage 1: $2500-ish
cam, valve springs, push rods, etc. - $1300
install labor - $500 (?)
custom tune - $500 (?)

stage2: +$4000 (?)
heads - $2500
fuel injectors - $350
cutom-build long tube headers and exhaust mods - $1000 (?)
2nd or different fuel pump - $300 (?)
else ?

That's a whole lotta extra cash for power I really don't need. At that point, it might be time to talk about a complete 6.0 swap instead of building the LS1. I think we won't go there.
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Old October 22nd, 2012, 08:13 PM   #7
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Quote:
Originally Posted by Kodiak450r View Post
if you could find some 02-04 LS6 heads for a decent price those would be worth putting on over the stock LS1 heads. they flow more cfm at the same lift then the LS1's
Any idea what casting number those are?
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Old October 22nd, 2012, 08:42 PM   #8
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12564243 for the LS6 heads
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Old October 22nd, 2012, 08:57 PM   #9
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I was just reading on LS1tech you can usually get 243 heads for $300-ish a set. That sounds like a pretty good plan.....
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Old October 22nd, 2012, 09:11 PM   #10
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Originally Posted by knaffie View Post
I was just reading on LS1tech you can usually get 243 heads for $300-ish a set. That sounds like a pretty good plan.....
Thats a pretty good deal. Like i said with a mild port job they could do very well on that engine.
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Old October 22nd, 2012, 09:25 PM   #11
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Thanks for the help! I'll have to see if I can find a set for a fair price.
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