11-30-2015, 08:24 AM | #1 |
What Aftermarket Heads?
What after market heads do you guys recommend for the LS7. My heads have been ported by Hennessey with the package that was bought... However I might go in a different direction.
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11-30-2015, 10:53 AM | #2 |
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,809
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heads aren't a big hp maker on the LS7 over the stockers. The biggest benefit of aftermarket heads is upgraded guides and one piece valves that should help the issues LS7 factory heads have. I would leave the heads alone and swap out the upper intake, throttle body, and pick a different cam profile. I heard Katech is a great company to look at for LS7 cams or BTR...give them a shout.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
11-30-2015, 03:49 PM | #3 |
Drives: 2015 Z/28 Black, A/C, Stereo Join Date: Oct 2015
Location: Tucson, AZ
Posts: 147
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If you don't mind, what did the HPE 650 run you? Considering it.
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11-30-2015, 08:19 PM | #4 |
Drives: 2015 Z/28 Join Date: Oct 2015
Location: So Cal
Posts: 129
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Another Z/28 owner with the HPE package said he paid $13K but he also said he wasn't super happy with the end numbers for the price he paid. Seems like lots of other shops can do quality work at a much more reasonable price. You're gonna pay a lot for the Hennessey name.
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11-30-2015, 08:24 PM | #5 |
Ed
Drives: 2013 AGM Camaro 2SS/RS/1LE Join Date: Dec 2012
Location: Seattle, WA
Posts: 951
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I'd stay away from Hennessey, buyer beware:
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11-30-2015, 08:45 PM | #6 | |
Drives: 2015 Z/28 HPE650 Join Date: Jul 2015
Location: LA
Posts: 73
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Quote:
Yea. I paid 13K for the 650 package. But it was more like 580HP. I tried for a long time to discuss it with them, but they never replied. I added a MSD intake, 102mm TB and a good tune from www.cunningham-motorsports.com its 590 at the wheels now. I think thats close to 650 motor. So my advice. Find someone else- Not Hennessy. |
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11-30-2015, 08:47 PM | #7 |
Drives: 2015 Z/28 HPE650 Join Date: Jul 2015
Location: LA
Posts: 73
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11-30-2015, 08:56 PM | #8 |
Drives: 14 1le Join Date: May 2012
Location: Walton, In
Posts: 329
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I ran ls7 prc 285 heads on my sleeved 454. They flow 415 cfm on 4.125 bore where the factory ls7s flow 370. My 454 made over 700 motor hp and over 600 rwhp.
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06 gto Maggie 489 rwhp sold
05 gto ERL/HKE 454 609rwhp na sold 06 Z06 500 rwhp sold 10 2ss ERL 427 530 rwhp sold 14 1ss 1le Last edited by delphigto; 12-03-2015 at 08:24 AM. |
11-30-2015, 09:54 PM | #9 |
Drives: Z28/700HP, CTSV/850HP, Viper/725HP Join Date: May 2009
Location: Addison, TX
Posts: 128
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We typically see 540s rwhp w cam & headers only
570s if you add the stg 2 WCC heads and 585-590 rwhp w cam, heads, headers, 102 TB and MSD intake all w pump gas and catalytic converters. A nice set of heads will make a nice gain IF chosen with the right cam |
12-01-2015, 10:27 AM | #10 |
I wouldn't get the Hennessey Package... Since I have taken ownership of the car, they are piss poor with their customer service... I had the car on a Dyno last week, and it put out 510 HP to the wheels... this is a far cry from where it should be and what they claim. My dyno graph from them shows 548 HP to the wheels. They won't let me know what grind the cam is so I am probably going to pull it all out and have a local race shop here in Charlotte redo everything. They are getting between 580-590 to the wheels with their 600 HP package... With Hennessey, you are just paying for the name... and some stupid stickers. Way over priced in my opinion. I am just glad I didn't pay for the Hennessey package... I bought the car used from a guy in Texas.
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12-01-2015, 10:53 AM | #11 |
Drives: 96SS Join Date: May 2009
Location: New Castle Delaware
Posts: 1,948
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12-01-2015, 02:29 PM | #12 |
Drives: 1999 Trans Am Join Date: Jul 2009
Location: Bridgewater,Ma
Posts: 2,017
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Just dyno'd a 15 Z28 with 450 miles on it stock. Made 436hp/402tq. The normal z06 vette makes 460hp/425tq. So, these z28's are down on power compared to the vette's.
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12-02-2015, 12:25 PM | #13 |
Dazed &
Drives: matte blue 2014 z28(186) 2015 R1 Join Date: Jun 2013
Location: The Jungle
Posts: 708
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hmm when k&n dyno'd mine it was 465/440 IIRC i have the graph at home.. i know dyno's are not really comparable but just throwing it out there..
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12-03-2015, 07:06 PM | #14 | |
Drives: Jeep Join Date: Sep 2015
Location: Galveston TX
Posts: 4
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Quote:
I trust that you are speaking from experience with Hennessy. You should post some relevant information to support your claim. I'm sure interested. If you're just passing along something you "heard on the Internet", it makes you sound like a douche. |
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