Dart Big M 540 oil driveshaft length
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Dart Big M 540 oil driveshaft length

  1. #1
    Senior Member Smallblocksperry's Avatar
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    Default Dart Big M 540 oil driveshaft length

    i made the mistake of not double checking the distrubutor height until putting the motor in my boat, went to put it in last night and its sticking approx .300" to high

    its a standard 9.8 deck height block, standard cam height etc.

    i bought the billet oil pump and oil pump driveshaft from boostpower, called them this morning and alexi confirmed that he shipped me a standard length, which is what i should of needed.

    he did mention due to cylinder heads being cut down, mains being machine etc that could have changed where the dist. needs to be, he recomended a slip collar dist. to solve the problem, does anyone see any issues with a oil pump driveshaft being to long (i still think this one was longer than stock, even though he claims they shipped a stnd. length) will it hold the dist. gear to far up and not fully engage the cam gear, i know they are engaging right now and i know the slip collar would work, just not sure if its going to be problem free. just invested a huge amount of time and money and i dont really want to risk it.

    right now if i pull out the dist. and measure from the top of the oil pump driveshaft to the sealing surface on the manifold its 6.750"

    900hp blown/intercooled 26' cat boat
    dart block 540"
    brodix bb2 heads, solid roller .650' lift

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  3. #2
    gn7
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    .300 is TON!!
    If the caps were cut for align hone/bore, its like .00X, its almost nil effect on the distributor.
    I have never cut a set of heads so much that I couldn't fix the distributor with extra distributor gasket.

    If the manifold is the reason the distributor is high, then the slip collar is the fix. But its something else, the slip collar will just be a band aid to the real problem.



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    Senior Member Bubbletop409's Avatar
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    Wrong shaft, no way milling the heads and or the block is going to change the height that much. And that excuse about the mains is pure BS.
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    gn7
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    Any chance the distributor you are using is for a tall deck?????



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    Senior Member Smallblocksperry's Avatar
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    Quote Originally Posted by gn7 View Post
    .300 is TON!!
    If the caps were cut for align hone/bore, its like .00X, its almost nil effect on the distributor.
    I have never cut a set of heads so much that I couldn't fix the distributor with extra distributor gasket.

    If the manifold is the reason the distributor is high, then the slip collar is the fix. But its something else, the slip collar will just be a band aid to the real problem.


    wonder why alexi from boostpower would tell me to band-aid it, he had all of the information stated above. this is bullshit, now i have to yank the motor pull the pan and put in the right oil pump driveshaft. he told me to send in my distributor and he would machine it into a slip collar one to save me the 275$ for a new dist. Then he said run it and check the gear for wear. Hmmmmmm seems like a good response....spend $xx,xxx on a motor, countless hours building it, rigging it, then just wonder if its putting wear and tear on components that will contaminate the whole motor, and possible take out my billet oil pump at very least

    i figured the one they sent me was longer due to the moroso billet oil pump, didnt think twice about throwing it in and running it because boostpower has a pretty reputable name, and i got all of the parts from them. lesson learned i guess, double check everything.

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    Senior Member Smallblocksperry's Avatar
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    Quote Originally Posted by gn7 View Post
    Any chance the distributor you are using is for a tall deck?????
    its the standard 8551 MSD 7.350" from mounting to tip of gear, used it on another BBC build, its the right one, even for a tall deck motor the oil pump driveshaft is the same length, to my understanding a longer oil pump driveshaft is only for raised cam height motors. I know they build some big ass motors there, im pretty sure they pulled the ol swap-a-roo on accident and i am going to pay the price

  9. #7
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    I've never had the problem nor have I seen it, but I have heard that there can be some clearance issues with the Dart blocks down at the bottom of the dist. Might check that out. See if there's some unusual rub marks on the bottom of the dist. Maybe mark it with a black marker before you install.
    On the other hand, .300 is about the amount they raise the cam tunnel....
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    gn7
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    Quote Originally Posted by Smallblocksperry View Post
    its the standard 8551 MSD 7.350" from mounting to tip of gear, used it on another BBC build, its the right one, even for a tall deck motor the oil pump driveshaft is the same length, to my understanding a longer oil pump driveshaft is only for raised cam height motors. I know they build some big ass motors there, im pretty sure they pulled the ol swap-a-roo on accident and i am going to pay the price
    The drive shafts are the same for both blocks, the distributors are different.



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  11. #9
    gn7
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    Quote Originally Posted by steelcomp View Post
    I've never had the problem nor have I seen it, but I have heard that there can be some clearance issues with the Dart blocks down at the bottom of the dist. Might check that out. See if there's some unusual rub marks on the bottom of the dist. Maybe mark it with a black marker before you install.
    On the other hand, .300 is about the amount they raise the cam tunnel....
    I've seen interference on the bottom of the gear where it passes thru the bottom support in the block. Sometimes the gear needs to be chamfered a little on the bottom edge.



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    .300" is about the amount that the distributor would be out of the block if the oil pump drive is not properly engaged in the gear,, any chance you were tired last night when you dropped it in?

    Before you tear the engine back out of the boat, you can use a long handled screwdriver to set into the oil pump drive, and measure the depth to compare against your distributor, either by marking the screwdriver or just holding your finger against it where it is even with the intake manifold.

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    Quote Originally Posted by obnoxious001 View Post
    .300" is about the amount that the distributor would be out of the block if the oil pump drive is not properly engaged in the gear,, any chance you were tired last night when you dropped it in?

    Before you tear the engine back out of the boat, you can use a long handled screwdriver to set into the oil pump drive, and measure the depth to compare against your distributor, either by marking the screwdriver or just holding your finger against it where it is even with the intake manifold.
    i measured and double checked, its grabbing the oil pump drive, anyone have a dist. out of their BBC to measure and compare to my 6.750 measurement in the opening post? that would confirm that i have the wrong oil driveshaft

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    Quote Originally Posted by Smallblocksperry View Post
    i measured and double checked, its grabbing the oil pump drive, anyone have a dist. out of their BBC to measure and compare to my 6.750 measurement in the opening post? that would confirm that i have the wrong oil driveshaft
    I don't have anything right at the moment without doing a complete mock up.

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    You could use an oil pump primer dealio to get the exact height to check against the dist.
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    Quote Originally Posted by steveo143 View Post
    You could use an oil pump primer dealio to get the exact height to check against the dist.
    He could,, or the long screwdriver I mentioned above too. I actually PM'ed my phone number to him earlier stating that I have a short block out that I can help him compare notes with if he calls me.

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