can you check cam timing without pulling the head
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can you check cam timing without pulling the head

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    Default can you check cam timing without pulling the head

    I have a 468 bbc with brodix 2x heads,jesel belt drive the motor has a 728 lift crane solid roller cam with 7-4 swap, here is what happened I had a oil leak on the jesel seal behind the top gear so I fixed I but my motor never ran right since so I think I have it off a little when I run it up on tdc the dots line up fine I just want to check it. Also the cam installes at 110 center. I will pull a head if I have to its not really a big deal but If I can check it easily without it I will. The problem I am having is finding true tdc with the big domed pistons that are in it.

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    Quote Originally Posted by matt k wheeler View Post
    I have a 468 bbc with brodix 2x heads,jesel belt drive the motor has a 728 lift crane solid roller cam with 7-4 swap, here is what happened I had a oil leak on the jesel seal behind the top gear so I fixed I but my motor never ran right since so I think I have it off a little when I run it up on tdc the dots line up fine I just want to check it. Also the cam installes at 110 center. I will pull a head if I have to its not really a big deal but If I can check it easily without it I will. The problem I am having is finding true tdc with the big domed pistons that are in it.
    You can check the intake centerline @ the retainer but if the lobe is not symetrical, it may not be the true centerline. You really need to be able to check int. valve opening @ .05 and to do that you need to be able to measure right off the lifter. If you can somehow attach a dial indicator with a long enough extension, you can do this with the head on. If you've never verified true TDC, you should do that as well.
    Last edited by scott foxwell; 09-01-2013 at 10:00 PM.
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    You should be able to get TDC reasonably close with a piston stop, regardless of the dome. You can set up a dial indicator using the push rod as an extension, but you need to be very very careful to get the indicator and the PR as inline as possible. Its not perfect, but can be reasonably close. Without an adjustable indicator stand that threads into a valve cover bolt hole or some similar anchor, its damn near impossible to get a decent reading.

    Like Steel said, you really need to do this from #1 intake .050 lifter rise from the timing card. Doing it from max lift and ASSUMING its a symmetrical cam can get you further off then the indicator/push rod setup can. I have seen asymmetrical lobes where the centerline is 6* from max lift.



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    Default 468 camshafts

    Well why I said it has a lot of dome is the only stop I have is one of those spring loaded ones that go straight into the spark plug hole and that one just bends over when I try and use that one. What piston stop are you guys using

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    See I have tried to degree it already and it didn't work I cam up was on a 130 so I changed it and got it to a 112 and the dam thing wouldn't run blows fire and im afraid I I keep screwing with it im going to bend a valve. Im thinking my magnetic base was moving and giving me a bad measurement. So I put it back on marks up and it runs and idles but just doensnt sound right thinking I might just pull a head and do it the right way. Also jesel says you install everything off of #6 cylinder whats your take on all that.

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    Quote Originally Posted by matt k wheeler View Post
    Well why I said it has a lot of dome is the only stop I have is one of those spring loaded ones that go straight into the spark plug hole and that one just bends over when I try and use that one. What piston stop are you guys using
    You're trying to use one of those "locator" deals. You can't use one of those.

    You need a STOP!
    You thread this in the hole a little ways so the piston is STOPPED just below TDC, then turn the engine the other way, and TDC is half way ON A DEGREE WHEEL between the to points.

    link: piston stop



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    Quote Originally Posted by matt k wheeler View Post
    I have a 468 bbc with brodix 2x heads,jesel belt drive the motor has a 728 lift crane solid roller cam with 7-4 swap, here is what happened I had a oil leak on the jesel seal behind the top gear so I fixed I but my motor never ran right since so I think I have it off a little when I run it up on tdc the dots line up fine I just want to check it. Also the cam installes at 110 center. I will pull a head if I have to its not really a big deal but If I can check it easily without it I will. The problem I am having is finding true tdc with the big domed pistons that are in it.
    If Ya don't know TDC is,how do you time the motor ?

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    Default 468

    Well I have been timing it with the timing ark but I didn this build this motor so I really don't trust that either so that's kinda the reason I am wanting to figure it all out for myself and I going to then there will be no more questions about it.

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