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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 09-29-2010, 04:30 PM   #1
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Port LS3 heads or invest in LS7 heads?

Just trying to figure out which would be a better way to go? (cost effectiveness)

Is is worth it to invest in CNC ported LS7 heads to swap out with the LS3's? Or am I better off just porting my LS3 heads? Either set up I go with would have new valves/springs, etc...

My plan is to get a 418ci or 427ci stroker kit(maybe), blower cam and procharger.
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Old 09-29-2010, 06:53 PM   #2
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LS7 heads wont fit on an ls3.
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Old 09-29-2010, 07:28 PM   #3
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Quote:
Originally Posted by Ovenmitt View Post
LS7 heads wont fit on an ls3.
not doubting you but why won't they fit?
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Old 09-29-2010, 07:31 PM   #4
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not doubting you but why won't they fit?
Bore is too small on the LS3 and valves would hit. You have 2 choices to get LS7 heads. Either go with a different block or go with ET small bore LS7 heads. Both options will be very pricey.
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Old 09-29-2010, 07:39 PM   #5
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answers my question then doesnt it! Thanks
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Old 09-30-2010, 09:11 AM   #6
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There's some good options coming very soon though... We have a aftermarket casting LS3 head being finished that will move LS7 flow numbers & still retain all your LS3 hardware. We also are working on a LS7 heads with large & small bore options!
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Old 10-01-2010, 10:59 AM   #7
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Stock head flow numbers from Car Craft:

http://www.carcraft.com/techarticles...ocker_arm.html
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Old 10-01-2010, 12:03 PM   #8
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throw the 427 stroker idea out the door... a 4.1" stroke crank is excessive

stock ls3's will flow enough, but if you feel the need to waste money, get a set of ported ls3 heads
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Old 10-01-2010, 12:24 PM   #9
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I would wait to see what SEMA brings.. it's only a month away.

That's when new parts get announced... especially something like what you want.
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Old 10-01-2010, 12:52 PM   #10
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Quote:
Originally Posted by danhr View Post
throw the 427 stroker idea out the door... a 4.1" stroke crank is excessive

stock ls3's will flow enough, but if you feel the need to waste money, get a set of ported ls3 heads
What he said If you're going forced induction with cam, stock LS3 heads would be more than enough.
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Old 10-02-2010, 09:31 PM   #11
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you would be better off to ditch the ls3 style all together and get some trick flow 235's or afr 230 heads.
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Old 10-03-2010, 12:10 PM   #12
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Quote:
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you would be better off to ditch the ls3 style all together and get some trick flow 235's or afr 230 heads.
uuhhh so you want him to spend MORE money for a set of heads that flow LESS, and would require him getting a different style intake, and either new fuel rails or an adapter kit?

explantation please
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Old 10-04-2010, 02:31 AM   #13
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Quote:
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uuhhh so you want him to spend MORE money for a set of heads that flow LESS, and would require him getting a different style intake, and either new fuel rails or an adapter kit?

explantation please
Yeah unless AFR or Trick Flow come out with a LS3 style head the cathedral port head idea would be a bad costly idea.
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Old 10-04-2010, 03:24 AM   #14
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get L92 ported heads
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Old 10-04-2010, 05:20 AM   #15
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Get a set of MAST motorsports black label heads. Tremendous flow improvement over stock heas.
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Old 10-04-2010, 07:58 AM   #16
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Get a set of MAST motorsports black label heads. Tremendous flow improvement over stock heas.
again, imho a bad idea. The OP planned on going FI, where head flow is not as crucial as either a N/A or Nitrous build. So the OP would be dropping $3,000+ on a set of heads for not so minimal gains.

I would spend that money on a 6 bolt block instead. This will allow plenty of room to grow with boost, as you don't have to worry about lifting a head (the first problem you run into with running boost), as you would with a 4 bolt head.
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Old 10-04-2010, 11:11 PM   #17
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4.125 Bore or larger for the LS7 heads
JMHO
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Old 10-05-2010, 09:20 AM   #18
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Do not forget with LS7 cylinder heads you have different rocker arm stances, and ratios, as well as valve height with the stock heads.

A good CNC port on your factory LS3 heads is a cost effective method to gain a considerable amount of airflow, and if you would like to increase the valve size you can easily out flow a LS7 cylinder head, for marginal costs.

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Old 10-05-2010, 02:35 PM   #19
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Port & polish your stock heads with a 5 angle valve job is my vote
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