454 mark IV
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454 mark IV

  1. #1
    Senior Member creepingcharlie's Avatar
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    Default 454 mark IV

    I found a Mark IV 4 bolt 454. Are these blocks any good?

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    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by creepingcharlie View Post
    I found a Mark IV 4 bolt 454. Are these blocks any good?
    As long as it's not cracked or bored to the limit hell yeah. There's more boats running MkIV blocks than there are GenV and VI.

    Just remember, you cannot use GenV heads on a MkIV block, but you can use MkIV and Gen VI heads.



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    Distinguished Member David 519's Avatar
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    My biggest complaint with standard Mk IV blocks is (not the Bowtie) the head bolts go into the water jacket. If the block has much use on it, you'll get really good at helicoiling bolt holes.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Default Mkiv

    Yep, have one with about 10 years of use. Two plugs, and 8 Helicoils. Plus replacement ARP studs because you ruin those too.

    Jerry

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    Senior Member creepingcharlie's Avatar
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    If I were to use arp studs would that help any and what is the max bore I can go.

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    Sit N' Spin Jetaholic's Avatar
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    According to my big block Chevy book, studs are required -

    Anything over 12.5:1 static compression ratio in a non-nitrous carbureted appilcation

    A nitrous motor using heathy doses of nitrous (200hp shot and up)

    A high boost supercharger or turbo charger application

    As far as the bore, they can be bored 0.060" over safely. Anything over that and you may want to have it sonic tested for wall thickness before going over this.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    Senior Member creepingcharlie's Avatar
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    Cool thanks.

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    steelcomp was here
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    Quote Originally Posted by billet racing View Post
    Yep, have one with about 10 years of use. Two plugs, and 8 Helicoils. Plus replacement ARP studs because you ruin those too.

    Jerry
    After having to helicoil a couple holes on each side of one of my first engines (tighten...strip...pull head, drill, tap, install insert, reinstall head...shit...another one stripped! arrgh!) I finally pulled both heads and just did them all. Now I dip the end of the stud in a little Permatex and it slows the corrosion way down.
    If God is your co-pilot, change seats!
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    steelcomp was here
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    Quote Originally Posted by David 519 View Post
    My biggest complaint with standard Mk IV blocks is (not the Bowtie) the head bolts go into the water jacket. If the block has much use on it, you'll get really good at helicoiling bolt holes.
    Yep. That's definitely a "what the hell were they thinking" GM engineering moment...
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    gn7
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    They were thinking "hey, lets follow Ford's small block brillant idea of running the water pump/timing cover bolts thru to the water jackets!



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    Quote Originally Posted by gn7 View Post
    They were thinking "hey, lets follow Ford's small block brillant idea of running the water pump/timing cover bolts thru to the water jackets!
    So you're syaing not only can't GM think for them self, but they can't even see a bad idea when someone else doses it?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by steelcomp View Post
    So you're syaing not only can't GM think for them self, but they can't even see a bad idea when someone else doses it?
    Now that's some funny shit

    Perhaps the best design idea GM ever came up wtih was the timing cover on the GM 2.8L motor. If the goal of the design was to ensure that the timing cover would not come loose, that design more than accomplished the task.
    Last edited by Jetaholic; 07-30-2009 at 08:33 AM.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    Some guys never learn. bocco's Avatar
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    So a question for future reference. If I end up rebuilding my 27 year old 454 that's never had the heads off. Should I just plan on having the machine shop heli coil the block? Or plan on using studs even for a low hp deal? Or both?

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    gn7
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    Quote Originally Posted by steelcomp View Post
    So you're syaing not only can't GM think for them self, but they can't even see a bad idea when someone else doses it?
    If your kid sticks a kitchen knive in a wall socket more than once, and cheats from the dumbest kid in the class during a test, you know he is destined to be a engineer for the BIG 3



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