What heads for the LS7???

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Jul 30, 2007 | 11:36 AM

jkittleson

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Racer

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From: Houston Texas

What heads for the LS7???

So I'm building a new LS7 to replace my LS2. Rotating assy. should be complete in a few weeks. Now I need heads. Looking for something reasonably priced that perform extremly well.

New LS7 heads cost around 2600 + 500 for valve springs and retainers

New ETP heads cost approx. 3000 + 220 for LS7 rockers?

World Products also has new heads that are reasonably price, but flow numbers are unknown...

From what I see there is a modest increase in flow with the ETP's. Will a slightly cleaned up set of LS7 heads outperform them?

Any suggestions good bad or indifferent?

Last edited by jkittleson; Jul 30, 2007 at 11:40 AM. Reason: Added World heads to options

Jul 30, 2007 | 11:54 AM

RC45

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From: Houston TX

FWIW I received the flow numbers for my ported GM LS7 heads on Friday.

Intake
307 CFM @ .400 lift
351 CFM @ .500 lift
376 CFM @ .600 lift
382 CFM @ .650 lift
385 CFM @ .700 lift

Exhaust
203 CFM @ .400 lift
224 CFM @ .500 lift
233 CFM @ .600 lift
237 CFM @ .650 lift
240 CFM @ .700 lift

It would be interesting to see the results of the other heads mentioned.

Stock LS7 Heads Flow numbers

Intake
302 CFM @ .400 lift
343 CFM @ .500 lift
360 CFM @ .600 lift
379 CFM @ .650 lift
? CFM @ .700 lift

Exhaust
200 CFM @ .400 lift
211 CFM @ .500 lift
220 CFM @ .600 lift
224 CFM @ .650 lift
? CFM @ .700 lift

Last edited by RC45; Jul 30, 2007 at 12:53 PM.

Jul 30, 2007 | 12:01 PM

jkittleson

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Racer

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From: Houston Texas

Quote:

Originally Posted by RC45

FWIW I received the flow numbers for my ported GM LS7 heads on Friday.

Intake
307 CFM @ .400 lift
351 CFM @ .500 lift
376 CFM @ .600 lift
385 CFM @ .700 lift

Exhaust
203 CFM @ .400 lift
224 CFM @ .500 lift
233 CFM @ .600 lift
240 CFM @ .700 lift

It would be interesting to see the results of the other heads mentioned.

ETP LS7 41 Heads flow:

Intake
307 CFM - .400
340 CFM - .500
355 CFM - .550
365 CFM - .600
374 CFM - .650

Exhaust
199 CFM - .400
220 CFM - .500
224 CFM - .550
226 CFM - .600
229 CFM - .650

Jul 30, 2007 | 12:30 PM

NORTY

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I think the stock LS7 heads flow about 330CFM @ 591, if memory serves.

Jul 30, 2007 | 12:41 PM

jkittleson

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Racer

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From: Houston Texas

At what point does the LS7 intake manifold become the limiting factor? Does it make sense to try and get the intake port flowing 400 CFM if the intake can't keep up?

Jul 30, 2007 | 12:42 PM

RC45

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I just found a PDF of the LS7 article in Feb 2006 Hot Rod magazine.

They quote 360CF @ .600.

http:\\http://www.gmperformanceparts.com/_r...378_eprint.pdf

See my first reply - I found the stock LS7 numbers.

Last edited by RC45; Jul 30, 2007 at 12:54 PM.

Jul 30, 2007 | 01:30 PM

jkittleson

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Racer

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From: Houston Texas

Looks like the stock head flow pretty well. I wonder what the increase in power would be by uping the flow 40 CFM on the intake side?

Is it worth the cost of ported heads? Is it going to make the difference between making 550 RWHP to 575 RWHP?

My budget is shot to hell....

Jul 30, 2007 | 09:54 PM

RC45

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From: Houston TX

I guess all the man-years of resources, experience and skill represented here at CorvetteForum have nothing more to offer than what we figured out on our own

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Jul 30, 2007 | 09:56 PM

Vindication

Melting Slicks

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From: Los Angeles Ca

Call Richard at West Coast Cylinder Heads. Hes doing a set of All Pros with Jesel Rockers for my 427. Pm me if you need more info.

Jul 30, 2007 | 10:10 PM

#10

RC45

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From: Houston TX

Quote:

Originally Posted by Vindication

Call Richard at West Coast Cylinder Heads. Hes doing a set of All Pros with Jesel Rockers for my 427. Pm me if you need more info.

What flow numbers and advantage should they offer over the GM LS7 heads?

Jul 30, 2007 | 10:12 PM

#11

Vindication

Melting Slicks

Joined: Oct 2005

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From: Los Angeles Ca

Quote:

Originally Posted by RC45

What flow numbers and advantage should they offer over the GM LS7 heads?

I do not have the flow numbers in front of me.

Last edited by Vindication; Jul 30, 2007 at 10:59 PM.

Jul 30, 2007 | 10:15 PM

#12

RC45

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From: Houston TX

Hmmm.. but is your 427 based on LS7 intake and pistons?

Jul 30, 2007 | 10:20 PM

#13

Vindication

Melting Slicks

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From: Los Angeles Ca

Yes it is.

Jul 30, 2007 | 10:38 PM

#14

RC45

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From: Houston TX

Interesting - what was the reason you went with the All Pro heads? So these are 12 degree heads then? Were you quoted a specific advantage by going with these heads?

Jul 30, 2007 | 10:41 PM

#15

Vindication

Melting Slicks

Joined: Oct 2005

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From: Los Angeles Ca

the deck is thicker on the All Pros than the LS7 heads. I didn't want the heads to start lifting off when the motor was under heavy boost.

Jul 30, 2007 | 10:46 PM

#16

RC45

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From: Houston TX

OK - so you are going forced induction. I was after NA thrills

Jul 30, 2007 | 10:50 PM

#17

Vindication

Melting Slicks

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From: Los Angeles Ca

I could be wrong but I think they use All Pros on NA set ups as well. Were you considering ETP heads?

Jul 30, 2007 | 10:55 PM

#18

jkittleson

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Racer

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Posts: 306

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From: Houston Texas

I am looking at options.

Can you run stock rockers with the All Pro's?

Do you know if the exhaust ports are in the same location for header fit? Also accessory bolt holes?

What intake are you running with these?

Jul 30, 2007 | 10:57 PM

#19

Vindication

Melting Slicks

Joined: Oct 2005

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From: Los Angeles Ca

Quote:

Originally Posted by jkittleson

I sent you a pm. I'm using a LS7 intake with these heads.

Jul 30, 2007 | 11:13 PM

#20

RC45

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From: Houston TX

Quote:

Originally Posted by Vindication

I could be wrong but I think they use All Pros on NA set ups as well. Were you considering ETP heads?

When I was looking around to build my nast NA LS7, I didnt get many concrete answers from the many head vendors about specific flow, hp and performance advantages over ported GM LS7 heads, so I went with LS7 block, heads and intake.

The motor is complete, and going in at this time. SHold be done in a few days.

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