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ProMaxx Performance Cast Iron Small Block Chevy Vortec Cylinder Heads Assembled

723-2151


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Cast Iron Small Block Chevy Vortec Cylinder Heads Assembled
$1,022.00
$996.47
SAVE $25.53
5 left in stock
Cast Iron Small Block Chevy Vortec Cylinder Heads
  • Assembled
  • Straight Plug
  • Intake Ports: 185cc
  • Combustion Chambers: 64cc
  • Valves: 2.02" Intake, 1.60" Exhaust
  • Hyd. Flat Tappet Springs
  • Pair
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    2151 - ProMaxx Performance Small Block Chevy Vortec Cylinder Heads is rated 2.8 out of 5 by 6.
    Rated 5 out of 5 by from Right out of the box I read every review I could find before I got them , not a lot out there. 268 flat tap cam 279/280 lift 750 quick fuel carb 1988 corvette stock bottom end So far heads work great, I did try a older intake but it failed to line up , vortec performer dropped right in place, car was TPI system and now it’s not , I have now put around 500 mi on the heads. I used the old center bolt valve covers at first they worked fine. I switched to the old style Crome they work as well. Getting a mid 4 second 0 to 60. The old stock TPI system was in the mid 5 second 0 to 60.
    Date published: 2018-07-24
    Rated 5 out of 5 by from Race Winning Heads - Great Affordable HP Bolted these on with a Jegs Vortec intake and immediately gained a tenth in the 1/4 in a 91 RS Camaro running a stock re-manufactured 350 with a Comp Cams HR cam and Magnum roller rockers and Magnum push rods. Over 125 runs in as of this posting and the heads performed like new. This is great HP for the money. And these can carry over to the next build.
    Date published: 2017-12-08
    Rated 3 out of 5 by from Stock center bolt valve covers would not work Got these heads couple of months ago very nice screw in studs guide plates stainless steel 5 cut valves 202 and160 the only problem the stock center bolt valve covers would not fit they hit on the guide plates which was a problem on the 99 suburban
    Date published: 2014-12-25
    Rated 2 out of 5 by from Promax heads vortec iron Both heads had valve seat problems 3 on one head 2 on the other all on exhaust side assembled heads . (But not bolt on) ( bad build quality)
    Date published: 2015-02-16
    Rated 1 out of 5 by from Look Elseware Out of the box as stated needs new seats installed!!!
    Date published: 2022-07-04
    Rated 1 out of 5 by from Don't buy! I purchased these heads for my 50 Chevy pickup engine build. I have to admit they looked great when I took them out of the box. My engine build went on hold for two years so the 3 month warranty was down the toilet before I installed them on my finished short block. I air checked them for valve seal and found that all 8 intake valves were leaking heavily thru the intake port. Disassembly revealed issues with seat height, all the valve guides so tight you had to tap the valves out especially on the exhaust side and after several attempts to seal one intake valve, we found that the leak was caused by a poorly installed intake seat. When the seat was tapped, it fell out. Same thing happened when the seat in the next cylinder was tapped. It fell out also. I'm having all the intake seats replaced now and will have to redo the valve job and hand ream the guides to get proper clearance. Why would it be necessary to install intake seats in a new set of cast iron heads? Poor castings? Oh yea, I forgot to mention that the valve seating area was not concentric. the seat width was thin on one side the thick on the other. If the engine had been fired up and been run thru the cam break in process, I'm sure the end result would have been catastrophic engine failure due to stuck valves and dropped intake seats. I'm lucky because I didn't have to troubleshoot these issues with the engine in the vehicle. Save yourself a lot of grief and purchase a different brand.
    Date published: 2018-03-16
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    What is the spring tension on these heads? Can you run hydraulic flat tappet liters in these? Do they have double springs and do you need to remove one to break in cam?

    Asked by: Mike
    The ProMaxx cylinder head 723-2151 is set up for hydraulic roller with single springs.
    Answered by: jshook
    Date published: 2023-10-26

    Hello do these heads fit a 95 z28 lt1...thanks

    Asked by: Galo
    The ProMaxx 723-2151 cylinder head will bolt to a '95 LT1 block.
    Answered by: jshook
    Date published: 2024-04-09

    What is the max lift on these heads

    Asked by: SCVFDBRANDON464
    The ProMaxx 723-2151 has cam specs of 575 in. max lift for hydraulic flat tappet camshafts or .500 in. max lift for hydraulic roller camshafts.
    Answered by: jshook
    Date published: 2023-05-02

    Is their an airgap intake you can recommend for these heads on a 400 sbc

    Asked by: Mike
    ProMaxx 723-2151 would work well with the Jegs 555-513036
    Answered by: langus
    Date published: 2022-08-01

    Since these heads come with guide plates do you need to use self aligning rocker arms? Or you could you use regular rockers and take the guide plates off? I have been told to run one or the other but never both

    Asked by: NateF
    You would use regular rocker arms with the guidplates or use self aligning rocker arms and take the guide plates off.
    Answered by: Rusty B
    Date published: 2020-02-28

    If running a vortec intake do you need to plug the center holes for oil seepage??

    Asked by: NateF
    You shouldn't need too, but some customer will just for extra security.
    Answered by: Rusty B
    Date published: 2022-11-14

    Will p/n 2151 work with Edelbrock Performer intake manifold for pre-'86 SBC? Or would it be better to buy a new Performer manifold for Vortec heads? What p/n springs can you recommend for hyd roller cams? Thank you.

    Asked by: VolvoTech
    The manifold will not line up and seal properly with these heads. Depending on the cam lift and machine work you do to the heads you can use Comp Cam #986-16
    Answered by: Dean R
    Date published: 2023-07-30

    I tried using a 1205 gasket and a team g intake the intake and gaskets don't cover the top of the intake runner there is a 1/6"gap at the top of the runner but a vortec intake covers the runner

    Asked by: Choper
    A vortec intake covers the runner because they're vortec heads. Please contact a technical representative so we can get more information on the engine and help from there. 1.800.345.4545
    Answered by: Dean R
    Date published: 2024-01-12
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