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Old 06-16-2011, 02:01 AM
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454 piston/rod noise

i purchased a truck with a knocking 454 cheap because previous owner had just rebuilt it and was a little upset bout the noise. my question is, (are these pistons in correctly) this is first BBC i have been into. i noticed the hole on piston and know that on sbc they go same way . wondering if this is correct or if he put 4 in upside down.i figured the standard block needed bored and my noise is piston slap from ware and honing when he rebuilt it.
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Last edited by 69chevy383; 06-16-2011 at 02:08 AM.
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Old 06-16-2011, 04:56 AM
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Yes, four pistons are wrong. Which means that the rods probably are also wrong. This could have also caused a bearing or big end rod failure.
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Old 06-16-2011, 04:04 PM
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Looks like 4 pistons are on the rods wrong, but what difference would it make with the valve reliefs in the same relationship with the heads/valves either way they are installed. If the pins are offset, then that makes a big difference, but I bet they are not.

If the rods were installed correctly on the pistons, then four rods would be installed in such a way that the rod bearings on those four would be tight against the crank throw filet. Which would probably push the rod tight against the other rod. Not good and would probably destroy the bearings on all four incorrectly installed rods and probably all eight.

Take it apart and see what is going on.
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