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  1. #11
    Xtreme Member


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    JeremY
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    1972 NovA
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    Quote Originally Posted by firebird_1995 View Post
    I'll be posting up in a few days the reasons for what I'm drawing up.
    ? ? ?
    '72 Nova "HadeSS"

  2. #12
    VIP Member


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    Nov 2010
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    CHRIS
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    94 CAMARO.
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    Biloxi, MS
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    To add some information. You can drill and tap the heads to use the std sbc pattern with the exception of the outer 4 bolt holes. At that point you can use unmodified fp1206 gaskets.
    http://ltxtech.com/forums/image.php?type=sigpic&userid=3572&dateline=1317253  626

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  4. #13
    8 Second Club


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    Camanche Iowa
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    Another good reason from drilling the heads to use sbc intake pattern is you can buy gaskets in many different port sizes and gasket thicknesses. Different thickness gaskets can help align ports if needed.
    So far 10.576 @ 128.64 on a 1.563 short time. N/A.
    8.957 @ 151.60 on a 1.349 60' time
    THE FIRST 8 SECOND NITROUS POWERED LT1

  5. #14
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    I know of another guy running washers like in post 2. If anybody makes a set, sign me up.

  6. #15
    10 Second N/A Club


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    Sep 2008
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    Josh
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    96 Z28
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    Holden, MO (KC)
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    Just got my heads back from being converted to SBC intake bolt pattern and I figured I's share some pics to help show difference for future searches. The difference is not only the spacing but also the bolt angle. The LT1 enters the head at an angle compared to the SBC that enters at 90* to the gasket surface.
    100_0604.JPG100_0606.JPG100_0605.JPG

    The bolt spacing is also different, the outside (4) line up (but are at the wrong angle). The center 4 need to be drilled/tapped. It's the ones just outside the runners that are tricky because the holes overlap. Here's and SBC gasket over an LT1 gasket:
    100_0608.JPG

    LT1 gasket laying over SBC, notice the holes overlapping outside the outer ports:
    100_0609.JPG


    There's a few ways to make it work, my local shop wanted to use epoxy and king serts to correct the angle and line up the outer (4) holes. This way I can use any SBC intake without any modification needed. As posted previously angled spacers can be made, and people have widened the holes outside the runners to retain use the LT1 hole and then omitted inner bolts. I'm sure all methods work, but here's the way I decided to go. King serts installed in outer four with epoxy sealing the LT1 holes and new holes drilled/tapped in the center.

    100_0607.JPG

    Hope this helps explain the difference for those looking into converting to SBC intake in the future!
    Last edited by 96LT1355Z28; 05-24-2016 at 10:12 PM.
    -Josh
    co-owner of BDBRacing.com
    NMCA OC 9004
    96, N/A 385, Holley EFI, Faceplated M6, AI TFS heads, LE SR cam, MWC Fab 9
    10.16 @ 136 1.50 60'........still workin on that 60' shootin for 1.4's!

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  8. #16
    InActive Member


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    Nov 2013
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    1997 K1500, SS/SB
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    I plugged the 4 middle bolt holes with brass all thread, filled smooth, then used a jig to get the correct 90 degree angle. drilled standard SBC bolt pattern and drove on. I'll try to get pictures.

    my first attempt I drilled the manifold used bushings washers bla bla bla , looked like Jethro had built it
    Last edited by Tinbender59; 06-09-2016 at 09:55 PM.

  9. #17
    The Nitrous Outlet Junkie


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    Troy
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    1994 Firebird Formula
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    took my heads to a wheel repair shop and had all center 8 holes welded up then with a jig i made i used a drill press and redrilled and tapped the holes for SBC bolt pattern.

    http://ltxtech.com/forums/showthread...TERBIRD/page46

    post #457


    cost me $40 at the rim shop and about 3 hours to drill and tap the heads going very slow
    Last edited by zooguy; 06-10-2016 at 04:47 PM.
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

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