bbc mark4 head gasket thickness
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bbc mark4 head gasket thickness

  1. #1
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    Default bbc mark4 head gasket thickness

    the one i removed seems to be about .035 (crushed)and the only ones in the shop are for a gen V and they seem to be about .055 (uncrushed). the old one is orange in color and has GM stamped into it so im figuring its a factory head gasket. this came from a crate mercury engine and i would have thought a marine head gasket would have been used, but then again it may actually be. question is, how do i tell? i called my local napa and they can get me a factory style gasket, but it doesnt say the thickness in thier books/computer. im hoping since i ordered an 89 mark4 head gasket that it will show up being the correct thickness since i am only changing one side. what should the uncrushed gasket measure?
    Fallbrook, Ca.

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    SAVE urself a bunch of headaches & go to Checker/Kragen or Auto Zone & get a pair of the blue Perma-Torque head gaskets ...no hassles that way & u will have matching gaskets on both heads! ...thats what i would do ...just my .02 cents

    FastRat

  4. #3
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Most of the head gaskets I have seen, only list (if they list) a compressed thickness, since uninstalled thickness matters not a bit.

    "Typical" Fel-Pro Blue Perma-Torques are listed as a .039" thickness (compressed), but, they have thicker, and thinner ones in their catologue.

    WHY are you changing ONE gasket?
    Water leak, burned, , blown between cylinder, something else?
    Other side deserves inspection and might as well replace to avoid a problem cropping up there the next time you run it.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    i agree, best would be to just get a set of blue perma torques from checkers, but at $42 a peice i cant do it. this is an engine for a friend that i am trying to get him on the water this weekend. he has no cash and really either do i. just cant seem to toss out 84+ bucks for an engine thats not even mine. but thanks for the advise, it really is the best way to go, just cant afford it right now.
    Fallbrook, Ca.

  7. #5
    It's what we do BDMarine's Avatar
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    Take a step back and think about this. If he can't afford two head gaskets, he can't afford gas to run the boat this weekend. I am not picking on either of you, but stop and wait until he can buy two head gaskets and do it right. Cutting corners WILL bite him in the ass. If the other head gasket is ready to let go, he will then buy another intake gasket set and change the watery oil, etc all over again.
    Just a suggestion.
    http://www.performanceboats.com//signaturepics/sigpic837_1.gif
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    I'm with BD.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    well i can agree with what your saying. and to be honest id do just that if it was mine. but this gasket didnt fail. the head was removed for inspection by the seller of the engine when he bought it, but the seller never told him he removed it nor did he re-torque and seal the head bolts. just a firm hand tighten was all they were. we found out after doing the install and getting ready for a test run. as we started cranking it over we saw water escaping from the front head bolt. thats when we found the bolts on that side were loosened. the boat is full of fuel and i am trying to get him out to elsinore for the Tom Papp memorial run. the boat is about 10 minutes from the lake and other than a bad gasket, it is ready to go. if it was a blown gasket from hours of use i would definatly do both head gaskets and atleast a top end. this is a cruiser and by no means a performance dealio, so there is no need for freshening the heads. besides they actually look awsome for a used motor. couldnt have many hours on this thing at all.
    also id like to shed a little light on the reason im trying to get him out there this weekend. see, his dad recently passed aswell and is having a hard time with it as you can expect. he really doesnt want to do anything with the boat. he was about to sign the damn thing over to me and let me keep it. i figured if i can get him out there were there is a ton of other people remembering a man they loved but still doing what they all loved (boating) he could see that giving up on boating is in no way to morn a death like that. trust me if i can afford to put in another 90 bucks into this boat right now id do it in a heart beat. next month, no problem. just dont have the cash right now. ive got alot into this boat allready. i re stringered it, re floored it, gel coated the bildge, gave him alot of my chevy parts to do the olds to chevy swap since the olds died too. im allready out ALOT of money as it is. and yes the wife is getting a bit angry with me for doing so much when we have our own stuff to keep managed. but she understands. so...... with all that said, i hope you can see my delema. yes i can say screw it and install the thicker gasket i allready have, or buy the single gasket that is the correct thickness. id just like to make sure it IS the correct thickness BEFORE i pay for it.
    thanks again for all the suggestions and advice. its good advice and should be taken. its just one of those "stuck between a rock and a hard place" type of deals.
    Fallbrook, Ca.

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    Quote Originally Posted by BDMarine View Post
    Cutting corners WILL bite him in the ass.



    Ain't that the truth. I learned that at about 16 y/o. It always costs ya more....I know.



    Darrell.
    San Diego.

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    With Twins

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    Quote Originally Posted by victorfb View Post
    well i can agree with what your saying. and to be honest id do just that if it was mine. but this gasket didnt fail. the head was removed for inspection by the seller of the engine when he bought it, but the seller never told him he removed it nor did he re-torque and seal the head bolts. just a firm hand tighten was all they were. we found out after doing the install and getting ready for a test run. as we started cranking it over we saw water escaping from the front head bolt. thats when we found the bolts on that side were loosened. the boat is full of fuel and i am trying to get him out to elsinore for the Tom Papp memorial run. the boat is about 10 minutes from the lake and other than a bad gasket, it is ready to go. if it was a blown gasket from hours of use i would definatly do both head gaskets and atleast a top end. this is a cruiser and by no means a performance dealio, so there is no need for freshening the heads. besides they actually look awsome for a used motor. couldnt have many hours on this thing at all.
    Ain't that just dandy.

    That sux, put one on it and have a good weekend.
    I'm sure you've CHECKED the other side by now, and every other bolt you can think of.

    And don't sweat a "marine" gasket. Not absolutely necisarry IMO.

    The ONLY reason "marine" fel-pro's are in my 454, was every other gasket they listed, had a larger than 4.250" fire ring, and my bore is stock.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

  12. #10
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    yes, we were quite dissappointed in not only what happened but our own ignorance for not checking them in the first place. but we were told it was good to go. i did check the other side just to make sure they were tight but i didnt want to break them loose and possibly break the seal of the head bolts to water jackets. it does however seem they are still torqued correctly. they all clicked at 85 pounds on my snap on torque wrench. i know that doesnt mean they are torqued correctly, but that tells me they werent lossened like the other side was. im sure we are good on that side. im waiting for napa to get the gasket in this morning and ill check what it is uncrushed and make an uneducated guess. thanks again.
    Fallbrook, Ca.

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