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Originally Posted by mike tkach
(Post 4110297)
are you sure it is not a gen 5.i have never heard of a gen 6 with a flat tappet cam.what is the block casting number?
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Originally Posted by 4bus
(Post 4110401)
Don't rule out a spark arc from a bad wire. My friend called me with a ticking two years ago, bad wire arcing on the block. Engine ran like crap, and the arc was so loud I thought it was a lifter. Weird
Hard to speculate these kinds of issues over the computer. A mechanics stethoscope or long screw driver to your ear can help isolate where the noise is coming from. |
Originally Posted by JRider
(Post 4110664)
Unless it came from Mercury. 575's and I believe others came with flats
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are gen 5's flat tappet?
Originally Posted by mike tkach
(Post 4110230)
gen6 all come with hyd roller cams,i doubt the person who did the rebuilds changed to flat tappit but stranger things do happen.
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yes.
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Originally Posted by MILD THUNDER
(Post 4110670)
That still baffles me. Why mercury would put roller lifters in the HP500's, 500EFI's, but not the 575sci? Weird.
What an improvement it was changing to an agressive full roller from the very conservative flat tappet. I really should put my pulleys back to stock and see what I got out of just the cam change |
Originally Posted by MILD THUNDER
(Post 4110668)
Yes. Mist the wires with a spray bottle of water, turn off the lights, and look for the light show. A non firing plug due to shorted plug wires, will def cause a rich exhaust, and make a ticking noise.
Hard to speculate these kinds of issues over the computer. A mechanics stethoscope or long screw driver to your ear can help isolate where the noise is coming from. |
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