Milled heads ?

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    Author Topic: Milled heads ?  (Read 1827 times)

    Offline brasil

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    Milled heads ?
    « on: May 16, 2016 - 05:49:56 AM »
    Hello folks.....

    last weekend I was thinking about changing my intake....  but I discoverd that only my OEM Cast Iron Intake matches with my engine...  if I want to use a 2176 EDE Intake for example... the intake sits higher..so the edges of the intake where the runners end ...sitting higher that the edges of the cyl. head...where the valvecovers will sit.   the result.. the covers will not fit properly...   also the intake will not seal against the heads..

    unfortunatly I don´t know how much the former owner milled the heads ( I think they where milled -  could be the block also....  ?  The 340 engine has the 68-69   X Heads...  so perhaps they milled the block also  to raise the CR..and end up with  "0" deck... ????

    So the 1 Million dollar question for me is....  how can I know..the amout my EDE Intake has to be milled...??  ( without pulling the heads )

    Thank you for your input /ideas

    Juergen
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    Offline cudabob496

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    Re: Milled heads ?
    « Reply #1 on: May 16, 2016 - 07:25:18 PM »
    seems you could mount up the intake, with bolts slightly tight, and take feeler gauge
    measurments around each head. Then take measurements and get an opinion from a
    machine shop how much to mill from intake.  I had a mismatch, so used two paper gaskets
    along with pan gasket, and opened intake bolt holes a little bit, and didn't have to machine anything.
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline 73_Cuda_4_Me

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    Re: Milled heads ?
    « Reply #2 on: May 16, 2016 - 07:51:54 PM »
    The rule of thumb is for every .010" milled off head, take .014" off intake... sounds like they did that for the OEM intake (it fits your current setup). New intake has original height machined in (sits higher on intake plane with heads milled).

    I'd talk to the machine shop you would use, have them set it up to take .014" off the new intake, then while they are still set up, check the first pass cut of .014" with a trial fit on your block. If it hasn't dropped enough, have them run a second .014" pass on the intake... I'd be really surprised if they milled more than .020" off the heads/block, but you might have to have a 3rd .014" cut...

    You are looking for 1/8" to 3/16" gap to the front and back block rails at centerline of engine. DO NOT USE CORK FRONT/REAR RAIL GASKETS WITH ALUMINUM INTAKE!!! The aluminum won't compress the cork like the cast iron intake will, and will never seal. Use RTV silicone sealer on front and rear rails (about 3/8" bead all along rails and overlapping the intake gasket at corners...

    My aluminum intake sits 1/8" above the rails as measured with feeler gauges..
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    Offline Chryco Psycho

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    Re: Milled heads ?
    « Reply #3 on: May 16, 2016 - 08:27:24 PM »
    What year 340 ?
     The 68 - 71 pistons were above the deck already & use the gasket for clearance so I doubt they milled it very far .
     The end rails will give you a good reference as to how much too high it sits
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    Offline rUNCHARGER

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    Re: Milled heads ?
    « Reply #4 on: May 16, 2016 - 08:34:23 PM »
    If you have an accurate way to measure the front and rear end rails and compare them on both intakes that will give you an idea.

    Sheldon
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    Offline Denison636

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    Re: Milled heads ?
    « Reply #5 on: May 16, 2016 - 09:51:07 PM »
    I know there was .010 taken off my block and another .010 off my heads and never had an issue with fitting my eddy intake. I also cc my heads to double check and came out to be 68 aprox and that was right for what I cut.
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    Its just a little 340 with a miss

    Offline cudabob496

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    Re: Milled heads ?
    « Reply #6 on: May 16, 2016 - 09:54:54 PM »
    Quote from: 73_Cuda_4_Me on May 16, 2016 - 07:51:54 PM
    The rule of thumb is for every .010" milled off head, take .014" off intake... sounds like they did that for the OEM intake (it fits your current setup). New intake has original height machined in (sits higher on intake plane with heads milled).

    I'd talk to the machine shop you would use, have them set it up to take .014" off the new intake, then while they are still set up, check the first pass cut of .014" with a trial fit on your block. If it hasn't dropped enough, have them run a second .014" pass on the intake... I'd be really surprised if they milled more than .020" off the heads/block, but you might have to have a 3rd .014" cut...

    You are looking for 1/8" to 3/16" gap to the front and back block rails at centerline of engine. DO NOT USE CORK FRONT/REAR RAIL GASKETS WITH ALUMINUM INTAKE!!! The aluminum won't compress the cork like the cast iron intake will, and will never seal. Use RTV silicone sealer on front and rear rails (about 3/8" bead all along rails and overlapping the intake gasket at corners...

    My aluminum intake sits 1/8" above the rails as measured with feeler gauges..

    I used felpros with the metal gasket, and has sealed fine for 10 years. But RTV is a good idea.
    « Last Edit: May 16, 2016 - 09:58:44 PM by cudabob496 »
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline Chryco Psycho

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    Re: Milled heads ?
    « Reply #7 on: May 16, 2016 - 10:13:26 PM »
    just re-tighten at the begining of each season
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    Offline YellowThumper

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    Re: Milled heads ?
    « Reply #8 on: May 17, 2016 - 11:37:28 AM »
    Any competent machine shop can do it. Doesn't have to be an automotive place.
    Have them use your existing one as a template to match. Have them show you it does match prior to accepting it.

    Mike
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    Offline brasil

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    Re: Milled heads ?
    « Reply #9 on: May 17, 2016 - 04:46:29 PM »
    thank you guys for all your answers !

    Today I took off the Iron intake...    and made some checks....   the Iron intake sits "flush " where the runners meat the head...  or in other words the edge of the head where the Valve cover gasket sits...is same level with the top of the runners.....  the ede intake sits a little higher than the iron intake
    so the Valve covers will not match ....    / seal...   

    Finally I "reused " my iron Intake ....   bought  FEL 1213 Gaskets....  and some  RTV  from Victor Reinz   then I closed the crossover in the iron intake... with 3mm Steel plates... ( welded them in..)....

    To get the Intake installed properly...I thrashed  the cork gaskets  ( front and rear )  and used a good bed of Silicone... aprox. 1/4 inch...or so..

    Then I torqued the screws in three steps... 15 / 25 / 35 lbs/ft....

    Tomorrow  I will go on with the work...  will give the silicone time to dry ..


    @ chryco   the engine is a 340 from 1973...   but I have the  X heads   and a 1971 Intake .....   


    Greetings Jurgen
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    Offline moper

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    Re: Milled heads ?
    « Reply #10 on: May 19, 2016 - 12:16:14 PM »
    I would take the one that fit and measure the clearance between the china rails (the ends of the valley areas of the block) and the lower surface of the intake. Then do the same with the Edelbrock intake. Take the difference between those two, double it, and have the Edelbrock one cut that amount on both intake flanges. Then trial fit it with the gaskets you want to use. Personally I use Ultraseal by Mr gasket. At that point you should be in the ball park. 
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    Offline brasil

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    Re: Milled heads ?
    « Reply #11 on: May 19, 2016 - 03:33:08 PM »
    @ moper

    thank you.... sounds like a good advise   I will check it out

    Greetings Juergen
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