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317s vs ls3 heads on 370 procharged

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Old Jun 30, 2014 | 08:41 PM
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Default 317s vs ls3 heads on 370 procharged
I've did some research but didn't see much comparing the 2 with boost. Im building a somewhat budget build 370 with a D1 procharger spinning at its max. I'm looking to maximize the bottom end as most cost effective as possible. I already have a set or 317 heads but they will need cleaned, checked and a valve job at minimum. ive also seen ported ls3 heads sold by vendors for roughly $1300ish. Either way i have to buy a cam to compliment either and the valve train to match the setup. I know the 317s are proven heads but would spending $1300 on ls3 heads really gain me much on a boosted setup over the 317s?
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Old Jul 1, 2014 | 12:59 AM
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If your gonna make the move to ls3 style port. Check out the lsa's.
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Old Jul 1, 2014 | 02:24 AM
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Originally Posted by Blown06
If your gonna make the move to ls3 style port. Check out the lsa's.
Agreed. That is what I am running
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Old Jul 1, 2014 | 07:13 AM
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The LS3 style ports flow much better than the 317 ports do, there is no comparison. Bob
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Old Jul 1, 2014 | 07:17 AM
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Originally Posted by Blown06
If your gonna make the move to ls3 style port. Check out the lsa's.
I agree! Bob
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Old Jul 1, 2014 | 07:31 AM
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I have never done a comparison but like they said the LSA should make more power. Take a look at how much more they flow and now think about how much more they will move at 15 pounds.
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Old Jul 1, 2014 | 04:33 PM
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can someone point me in the right direction of a vendor that sales lsa heads?
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Old Jul 1, 2014 | 04:53 PM
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Lsa heads for sure
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Old Jul 1, 2014 | 07:54 PM
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Not trying to high jack ur thread but as i am gonna be building a 370 also and already have a set of ls3 heads i didnt have to spend money on but my next question im trying to figure out is either finding a stock intake for it again or is it worth spending money on like a holley high ram?
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Old Jul 1, 2014 | 08:34 PM
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Originally Posted by burbalanche
Not trying to high jack ur thread but as i am gonna be building a 370 also and already have a set of ls3 heads i didnt have to spend money on but my next question im trying to figure out is either finding a stock intake for it again or is it worth spending money on like a holley high ram?
The LS3 intake does a good job, but more power can be found with an aftermarket intake. I guess it would depend on if you already have an LS3 intake and what your goals are. Bob
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Old Jul 1, 2014 | 09:07 PM
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OP. From a cost/performance stand point if you already have the 317s use them. If you have an extra $1300 to blow on heads then send the 317's to AI and have them ported.
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Old Jul 1, 2014 | 09:10 PM
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I only have stock 6.0 intake and running ls3 heads i have to get a new intake either way so trying to figure out wat would be a good one to get? The holley or any others? Will be running e85 th400 fi s480 probably and in a roughly 5000lb truck. Power wise idk say 7s ?? Thanks
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Old Jul 2, 2014 | 10:09 PM
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I found a set of brand new LS3 heads on here in the classifieds section for $675 shipped. LS3 heads in stock form should still outflow a set of ported 317's. And The LS3 intake manifold also moves a ton of air in stock form and they're cheap.
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Old Jul 3, 2014 | 07:13 PM
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Originally Posted by yonerhottlt1
I found a set of brand new LS3 heads on here in the classifieds section for $675 shipped. LS3 heads in stock form should still outflow a set of ported 317's. And The LS3 intake manifold also moves a ton of air in stock form and they're cheap.
I tried finding the thread with no luck.

From what I gather, lsa heads are the best and strongest but ls3 heads will do fine for my power level (under 900) and regardless will be a step up from my 317s. Sound about right?
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Old Jul 4, 2014 | 04:59 AM
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Originally Posted by speedfreak2685
I tried finding the thread with no luck.

From what I gather, lsa heads are the best and strongest but ls3 heads will do fine for my power level (under 900) and regardless will be a step up from my 317s. Sound about right?
Yes indeed, a huge step up from the 317 heads in cfm. Bob
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Old Jul 4, 2014 | 06:43 AM
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My buddy makes 1190whp on BONE STOCK ls3 heads & intake with a precision 8891 and standard size head studs. All I'm the tune and packing the right cam to make sure your cylinder pressure is where it needs to be. If you can find LSA heads for a good deal go that way, I would buy either one however
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Old Jul 4, 2014 | 04:00 PM
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Originally Posted by I8URLS1
My buddy makes 1190whp on BONE STOCK ls3 heads & intake with a precision 8891 and standard size head studs.........
Those are impressive numbers! At what boost pressure is that 1190 achieved? You are correct that the right can and tune is key!
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Old Jul 4, 2014 | 04:06 PM
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Originally Posted by Bob@BruteSpeed
The LS3 "STYLE" ports flow much better than the 317 ports do, there is no comparison. Bob
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Old Jul 4, 2014 | 05:39 PM
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Originally Posted by 2000RATA
Those are impressive numbers! At what boost pressure is that 1190 achieved? You are correct that the right can and tune is key!
19-20psi
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