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Thread: intake manifold for 70 heads on 1990 454
          
   
   

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  1. #1
    fullslp is offline CHR Member Visit my Photo Gallery
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    intake manifold for 70 heads on 1990 454

     



    is there an intake manifold out there to bolt up 1970 heads to my 1990 454 big block?

    the motor will be carbed.

    thanks for any and all help

  2. #2
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
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    any one will fit what port do you have ? do you have a one pice rear main seal block mark 5 -6 or is it a two pice rear main seal mark 4? if a mark 5 -6 them heads may leak in the lifter valley

  3. #3
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: BLOWN 540 57 CHEVY
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    Quote Originally Posted by fullslp
    is there an intake manifold out there to bolt up 1970 heads to my 1990 454 big block?

    the motor will be carbed.

    thanks for any and all help
    What?You have lost me.Can you ask the question in a different way?

  4. #4
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: BLOWN 540 57 CHEVY
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    Quote Originally Posted by pat mccarthy
    any one will fit what port do you have ? do you have a one pice rear main seal block mark 5 -6 or is it a two pice rear main seal mark 4? if a mark 5 -6 them heads may leak in the lifter valley
    You made it to easy for him.I wanted him to give us more info.
    No you are not 43 either.

  5. #5
    pat mccarthy's Avatar
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    old heads new block the intake bolts patterns are the same so a o port can be put on rec ports and rec port on o port heads . i would not do it but it has been done with a the right intake gasket and yes i will be 43 you young pup

  6. #6
    fullslp is offline CHR Member Visit my Photo Gallery
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    sorry i'm a small block guy.
    i just came across this 90 454 and these 70 heads and thought can i make it work? iv'e done small block ls1-lt1 carb conversions and that went well so why not a big block..
    the block is a mark 5 one piece r-main seal
    the heads are out getting cleaned up by a buddy and i'll post the casting # when they get back.the ports and valves are huge compared to other big block heads iv'e seen . this guy told me they were race heads. i would like to know where they came from. is there some place i can get that info with the casting #..thanks again guys . this site is sweet

  7. #7
    CHEVYBOY's Avatar
    CHEVYBOY is offline CHR Member Visit my Photo Gallery
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    sorry to change the subject but what did you do to put a carb on a lt1 mines a 94 and did it run about the same

  8. #8
    pat mccarthy's Avatar
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    them heads are not good for that block. they are not made for it .you can put new heads on a old block but it will not work good the way you want to do it it will leak in the valley like i said

  9. #9
    kitz's Avatar
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    Like Pat says ...........

    If it's a Mark IV block the heads should work. Gen V they will likely leak coolant into the valley ..............

    Kitz
    Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400

  10. #10
    fullslp is offline CHR Member Visit my Photo Gallery
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    thanks alot guys i really appreciate the help ..i'll just sell the heads, the last thing i want is more car headaches..
    the carbed lt1 was a conversion that i bought used from a guy. if you run a search on camaroz28.com you will find lots of info...however i tune fuel injection systems and if you set up the f.i. right it is much more street powerful than the carb..(can't beat f.i. low end power thanks to always ajusting air fuel ratio and timing) if your going for max power than its a toss up...thanks again guys

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