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Old 07-12-2016, 01:45 PM
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lentiman lentiman is offline
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5.7L ILMOR: spark plug, wires, serpentine change tips

Hi all, I've hit 300 hours on my 5.7L ilmor and while I'm mechanically inclined I've never changed plugs, wires, or belts from an engine before. Just did my oil and will be changing out the transmission fluid with Rotella T 15W-40 oil as per ILMOR's advice. On this engine is there anything special to know when changing out the plugs and wires? I don't think I need to gap the plugs, just take out the old ones and put in the new? Tighten to a certain torque or just not overtighten? I think the wires should be straight forward. Serpentine belt advice? When I re-tighten the new belt how do you determine how tight to go?

I've seen that the following are the correct parts:
Plugs: ACDelco 41-110 (0.04 gap)
Wires: ACDelco 9718Q
Belt: PV06740

Should I do the cap and rotor at the same time?

Last edited by lentiman; 07-12-2016 at 03:26 PM.
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Old 07-18-2016, 12:36 PM
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lentiman lentiman is offline
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bumping this thread
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Old 07-19-2016, 01:47 PM
curver900 curver900 is offline
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check the gap on all the new plugs

add anti seize to the plug threads

I don't "torque" plugs just good and tight but don't strip

there should be a small amount of deflection on the belt.. recheck after 5 hours.. deflection should be less than (guess for me) but around 1/2 inch or so

if doing all that put on a new cap and rotor...
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